LeetCode 2016 37,65,212,84,130,218
38982 ワード
37 Sudoku Solver
65 Valid Number
212 Word Search II
84 Largest Rectangle in Histogram
130 Surrounded Regions
218 The Skyline Problem
// ----------------Seeing Discuss-----------
/*
copying codes
url
https://discuss.leetcode.com/topic/5002/a-simple-dfs-solution
Analysis:
*/
class Solution {
public:
bool isValidSudoku(vector > &board) {
return true;
}
void solveSudoku(vector > &board) {
util(board, 0);
}
bool util(vector>& board, int pos)
{
if (pos >= 81)
return true;
int i = pos / 9;
int j = pos % 9;
if (board[i][j] != '.')
return util(board, pos + 1);
else
{
for (char c = '1'; c <= '9'; c++)
{
if (!isInRow(board, i,c) && !isInCol(board, j, c) && !isInRec(board, i, j, c))
{
board[i][j] = c;
if (util(board, pos + 1))
return true;
else
board[i][j] = '.';
}
}
return false;
}
}
bool isInRow(vector>& board, int i, char c)
{
vector& row = board[i];
for (int k = 0; k < 9; k++)
{
if (row[k] == c)
return true;
}
return false;
}
bool isInCol(vector>& board,int j, char c)
{
for (int k = 0; k < 9; k++)
{
if (board[k][j] == c)
return true;
}
return false;
}
bool isInRec(vector>& board, int i, int j, char c)
{
int bigrow = i / 3, bigcol = j / 3;
for (int m = 3 * bigrow; m < 3 * (bigrow + 1); m++)
{
for (int n = 3 * bigcol; n < 3 * (bigcol + 1); n++)
if (board[m][n] == c)
return true;
}
return false;
}
}; 65 Valid Number
// ----------------Seeing Discuss-----------
/*
copying codes
url
https://discuss.leetcode.com/topic/2710/a-simple-solution-in-cpp
*/
class Solution {
public:
bool isNumber(string s)
{
int i=0;
for(;s[i]==' ';i++) {}
if(s[i]=='+' || s[i]=='-') i++;
int n_nm,n_pt;
for(n_nm=0,n_pt=0;(s[i]<='9' && s[i]>='0')|| s[i]=='.';i++)
s[i] =='.'?n_pt++:n_nm++;
if(n_pt>1 || n_nm<1) return false;
if(s[i]=='e')
{
i++;
if(s[i]=='+' || s[i]=='-')i++;
int n_nm=0;
for(;s[i]>='0' && s[i]<='9';i++,n_nm++){}
if(n_nm<1) return false;
}
for(;s[i]==' ';i++){}
return s[i]==0;
}
};212 Word Search II
// ---------------------Seeing Discuss -------------
/*
copying codes
url:
https://discuss.leetcode.com/topic/20210/my-ac-very-clean-c-code
The idea is start from every position of the board, and then see if we can
find a word starting from this position with checking if is_end is true in TrieNode structure
*/
class TrieNode{
public:
bool is_end;
vector children;
TrieNode(){
is_end=false;
children=vector(26, NULL);
}
};
class Trie{
public:
TrieNode* getRoot(){return root;}
Trie(vector& words){
root=new TrieNode();
for(int i=0; ichildren[index]==NULL)
cur->children[index]=new TrieNode();
cur=cur->children[index];
}
cur->is_end=true;
}
private:
TrieNode* root;
};
class Solution {
public:
vector findWords(vector>& board, vector& words) {
Trie* trie = new Trie(words);
TrieNode* root=trie->getRoot();
set result_set;
for(int x=0; x result;
for(auto it:result_set) result.push_back(it);
return result;
}
private:
void findWords(vector>& board, int x, int y, TrieNode* root, string word, set& result){
if(x<0||x>=board.size()||y<0||y>=board[0].size() || board[x][y]==' ') return;
if(root->children[board[x][y]-'a'] != NULL){
word=word+board[x][y];
root=root->children[board[x][y]-'a'];
if(root->is_end) result.insert(word);
char c=board[x][y];
board[x][y]=' ';
findWords(board, x+1, y, root, word, result);
findWords(board, x-1, y, root, word, result);
findWords(board, x, y+1, root, word, result);
findWords(board, x, y-1, root, word, result);
board[x][y]=c;
}
}
};
// -------------------TLE 1st depth first search--------------------
// 35 / 37 test cases passed.
// the TLE data point:
// ["aaaa","aaaa","aaaa","aaaa","bcde","fghi","jklm","nopq","rstu","vwxy","zzzz"]
// ["aaaaaaaaaaaaaaaa","aaaaaaaaaaaaaaab","aaaaaaaaaaaaaaac","aaaaaaaaaaaaaaad","aaaaaaaaaaaaaaae","aaaaaaaaaaaaaaaf","aaaaaaaaaaaaaaag","aaaaaaaaaaaaaaah","aaaaaaaaaaaaaaai","aaaaaaaaaaaaaaaj","aaaaaaaaaaaaaaak","aaaaaaaaaaaaaaal","aaaaaaaaaaaaaaam","aaaaaaaaaaaaaaan","aaaaaaaaaaaaaaao","aaaaaaaaaaaaaaap","aaaaaaaaaaaaaaaq","aaaaaaaaaaaaaaar","aaaaaaaaaaaaaaas","aaaaaaaaaaaaaaat","aaaaaaaaaaaaaaau","aaaaaaaaaaaaaaav","aaaaaaaaaaaaaaaw","aaaaaaaaaaaaaaax","aaaaaaaaaaaaaaay","aaaaaaaaaaaaaaaz","aaaaaaaaaaaaaaaa","aaaaaaaaaaaaaaab","aaaaaaaaaaaaaaac","aaaaaaaaaaaaaaad","aaaaaaaaaaaaaaae","aaaaaaaaaaaaaaaf","aaaaaaaaaaaaaaag","aaaaaaaaaaaaaaah","aaaaaaaaaaaaaaai","aaaaaaaaaaaaaaaj","aaaaaaaaaaaaaaak","aaaaaaaaaaaaaaal","aaaaaaaaaaaaaaam","aaaaaaaaaaaaaaan","aaaaaaaaaaaaaaao","aaaaaaaaaaaaaaap","aaaaaaaaaaaaaaaq","aaaaaaaaaaaaaaar","aaaaaaaaaaaaaaas","aaaaaaaaaaaaaaat","aaaaaaaaaaaaaaau","aaaaaaaaaaaaaaav","aaaaaaaaaaaaaaaw","aaaaaaaaaaaaaaax","aaaaaaaaaaaaaaay","aaaaaaaaaaaaaaaz","aaaaaaaaaaaaaaba","aaaaaaaaaaaaaabb","aaaaaaaaaaaaaabc","aaaaaaaaaaaaaabd","aaaaaaaaaaaaaabe","aaaaaaaaaaaaaabf","aaaaaaaaaaaaaabg","aaaaaaaaaaaaaabh","aaaaaaaaaaaaaabi","aaaaaaaaaaaaaabj","aaaaaaaaaaaaaabk","aaaaaaaaaaaaaabl","aaaaaaaaaaaaaabm","aaaaaaaaaaaaaabn","aaaaaaaaaaaaaabo","aaaaaaaaaaaaaabp","aaaaaaaaaaaaaabq","aaaaaaaaaaaaaabr","aaaaaaaaaaaaaabs","aaaaaaaaaaaaaabt","aaaaaaaaaaaaaabu","aaaaaaaaaaaaaabv","aaaaaaaaaaaaaabw","aaaaaaaaaaaaaabx","aaaaaaaaaaaaaaby","aaaaaaaaaaaaaabz","aaaaaaaaaaaaaaca","aaaaaaaaaaaaaacb","aaaaaaaaaaaaaacc","aaaaaaaaaaaaaacd","aaaaaaaaaaaaaace","aaaaaaaaaaaaaacf","aaaaaaaaaaaaaacg","aaaaaaaaaaaaaach","aaaaaaaaaaaaaaci","aaaaaaaaaaaaaacj","aaaaaaaaaaaaaack","aaaaaaaaaaaaaacl","aaaaaaaaaaaaaacm","aaaaaaaaaaaaaacn","aaaaaaaaaaaaaaco","aaaaaaaaaaaaaacp","aaaaaaaaaaaaaacq","aaaaaaaaaaaaaacr","aaaaaaaaaaaaaacs","aaaaaaaaaaaaaact","aaaaaaaaaaaaaacu","aaaaaaaaaaaaaacv","aaaaaaaaaaaaaacw","aaaaaaaaaaaaaacx","aaaaaaaaaaaaaacy","aaaaaaaaaaaaaacz","aaaaaaaaaaaaaada","aaaaaaaaaaaaaadb","aaaaaaaaaaaaaadc","aaaaaaaaaaaaaadd","aaaaaaaaaaaaaade","aaaaaaaaaaaaaadf","aaaaaaaaaaaaaadg","aaaaaaaaaaaaaadh","aaaaaaaaaaaaaadi","aaaaaaaaaaaaaadj","aaaaaaaaaaaaaadk","aaaaaaaaaaaaaadl","aaaaaaaaaaaaaadm","aaaaaaaaaaaaaadn","aaaaaaaaaaaaaado","aaaaaaaaaaaaaadp","aaaaaaaaaaaaaadq","aaaaaaaaaaaaaadr","aaaaaaaaaaaaaads","aaaaaaaaaaaaaadt","aaaaaaaaaaaaaadu","aaaaaaaaaaaaaadv","aaaaaaaaaaaaaadw","aaaaaaaaaaaaaadx","aaaaaaaaaaaaaady","aaaaaaaaaaaaaadz","aaaaaaaaaaaaaaea","aaaaaaaaaaaaaaeb","aaaaaaaaaaaaaaec","aaaaaaaaaaaaaaed","aaaaaaaaaaaaaaee","aaaaaaaaaaaaaaef","aaaaaaaaaaaaaaeg","aaaaaaaaaaaaaaeh","aaaaaaaaaaaaaaei","aaaaaaaaaaaaaaej","aaaaaaaaaaaaaaek","aaaaaaaaaaaaaael","aaaaaaaaaaaaaaem","aaaaaaaaaaaaaaen","aaaaaaaaaaaaaaeo","aaaaaaaaaaaaaaep","aaaaaaaaaaaaaaeq","aaaaaaaaaaaaaaer","aaaaaaaaaaaaaaes","aaaaaaaaaaaaaaet","aaaaaaaaaaaaaaeu","aaaaaaaaaaaaaaev","aaaaaaaaaaaaaaew","aaaaaaaaaaaaaaex","aaaaaaaaaaaaaaey","aaaaaaaaaaaaaaez","aaaaaaaaaaaaaafa","aaaaaaaaaaaaaafb","aaaaaaaaaaaaaafc","aaaaaaaaaaaaaafd","aaaaaaaaaaaaaafe","aaaaaaaaaaaaaaff","aaaaaaaaaaaaaafg","aaaaaaaaaaaaaafh","aaaaaaaaaaaaaafi","aaaaaaaaaaaaaafj","aaaaaaaaaaaaaafk","aaaaaaaaaaaaaafl","aaaaaaaaaaaaaafm","aaaaaaaaaaaaaafn","aaaaaaaaaaaaaafo","aaaaaaaaaaaaaafp","aaaaaaaaaaaaaafq","aaaaaaaaaaaaaafr","aaaaaaaaaaaaaafs","aaaaaaaaaaaaaaft","aaaaaaaaaaaaaafu","aaaaaaaaaaaaaafv","aaaaaaaaaaaaaafw","aaaaaaaaaaaaaafx","aaaaaaaaaaaaaafy","aaaaaaaaaaaaaafz","aaaaaaaaaaaaaaga","aaaaaaaaaaaaaagb","aaaaaaaaaaaaaagc","aaaaaaaaaaaaaagd","aaaaaaaaaaaaaage","aaaaaaaaaaaaaagf","aaaaaaaaaaaaaagg","aaaaaaaaaaaaaagh","aaaaaaaaaaaaaagi","aaaaaaaaaaaaaagj","aaaaaaaaaaaaaagk","aaaaaaaaaaaaaagl","aaaaaaaaaaaaaagm","aaaaaaaaaaaaaagn","aaaaaaaaaaaaaago","aaaaaaaaaaaaaagp","aaaaaaaaaaaaaagq","aaaaaaaaaaaaaagr","aaaaaaaaaaaaaags","aaaaaaaaaaaaaagt","aaaaaaaaaaaaaagu","aaaaaaaaaaaaaagv","aaaaaaaaaaaaaagw","aaaaaaaaaaaaaagx","aaaaaaaaaaaaaagy","aaaaaaaaaaaaaagz","aaaaaaaaaaaaaaha","aaaaaaaaaaaaaahb","aaaaaaaaaaaaaahc","aaaaaaaaaaaaaahd","aaaaaaaaaaaaaahe","aaaaaaaaaaaaaahf","aaaaaaaaaaaaaahg","aaaaaaaaaaaaaahh","aaaaaaaaaaaaaahi","aaaaaaaaaaaaaahj","aaaaaaaaaaaaaahk","aaaaaaaaaaaaaahl","aaaaaaaaaaaaaahm","aaaaaaaaaaaaaahn","aaaaaaaaaaaaaaho","aaaaaaaaaaaaaahp","aaaaaaaaaaaaaahq","aaaaaaaaaaaaaahr","aaaaaaaaaaaaaahs","aaaaaaaaaaaaaaht","aaaaaaaaaaaaaahu","aaaaaaaaaaaaaahv","aaaaaaaaaaaaaahw","aaaaaaaaaaaaaahx","aaaaaaaaaaaaaahy","aaaaaaaaaaaaaahz","aaaaaaaaaaaaaaia","aaaaaaaaaaaaaaib","aaaaaaaaaaaaaaic","aaaaaaaaaaaaaaid","aaaaaaaaaaaaaaie","aaaaaaaaaaaaaaif","aaaaaaaaaaaaaaig","aaaaaaaaaaaaaaih","aaaaaaaaaaaaaaii","aaaaaaaaaaaaaaij","aaaaaaaaaaaaaaik","aaaaaaaaaaaaaail","aaaaaaaaaaaaaaim","aaaaaaaaaaaaaain","aaaaaaaaaaaaaaio","aaaaaaaaaaaaaaip","aaaaaaaaaaaaaaiq","aaaaaaaaaaaaaair","aaaaaaaaaaaaaais","aaaaaaaaaaaaaait","aaaaaaaaaaaaaaiu","aaaaaaaaaaaaaaiv","aaaaaaaaaaaaaaiw","aaaaaaaaaaaaaaix","aaaaaaaaaaaaaaiy","aaaaaaaaaaaaaaiz","aaaaaaaaaaaaaaja","aaaaaaaaaaaaaajb","aaaaaaaaaaaaaajc","aaaaaaaaaaaaaajd","aaaaaaaaaaaaaaje","aaaaaaaaaaaaaajf","aaaaaaaaaaaaaajg","aaaaaaaaaaaaaajh","aaaaaaaaaaaaaaji","aaaaaaaaaaaaaajj","aaaaaaaaaaaaaajk","aaaaaaaaaaaaaajl","aaaaaaaaaaaaaajm","aaaaaaaaaaaaaajn","aaaaaaaaaaaaaajo","aaaaaaaaaaaaaajp","aaaaaaaaaaaaaajq","aaaaaaaaaaaaaajr","aaaaaaaaaaaaaajs","aaaaaaaaaaaaaajt","aaaaaaaaaaaaaaju","aaaaaaaaaaaaaajv","aaaaaaaaaaaaaajw","aaaaaaaaaaaaaajx","aaaaaaaaaaaaaajy","aaaaaaaaaaaaaajz","aaaaaaaaaaaaaaka","aaaaaaaaaaaaaakb","aaaaaaaaaaaaaakc","aaaaaaaaaaaaaakd","aaaaaaaaaaaaaake","aaaaaaaaaaaaaakf","aaaaaaaaaaaaaakg","aaaaaaaaaaaaaakh","aaaaaaaaaaaaaaki","aaaaaaaaaaaaaakj","aaaaaaaaaaaaaakk","aaaaaaaaaaaaaakl","aaaaaaaaaaaaaakm","aaaaaaaaaaaaaakn","aaaaaaaaaaaaaako","aaaaaaaaaaaaaakp","aaaaaaaaaaaaaakq","aaaaaaaaaaaaaakr","aaaaaaaaaaaaaaks","aaaaaaaaaaaaaakt","aaaaaaaaaaaaaaku","aaaaaaaaaaaaaakv","aaaaaaaaaaaaaakw","aaaaaaaaaaaaaakx","aaaaaaaaaaaaaaky","aaaaaaaaaaaaaakz","aaaaaaaaaaaaaala","aaaaaaaaaaaaaalb","aaaaaaaaaaaaaalc","aaaaaaaaaaaaaald","aaaaaaaaaaaaaale","aaaaaaaaaaaaaalf","aaaaaaaaaaaaaalg","aaaaaaaaaaaaaalh","aaaaaaaaaaaaaali","aaaaaaaaaaaaaalj","aaaaaaaaaaaaaalk","aaaaaaaaaaaaaall","aaaaaaaaaaaaaalm","aaaaaaaaaaaaaaln","aaaaaaaaaaaaaalo","aaaaaaaaaaaaaalp","aaaaaaaaaaaaaalq","aaaaaaaaaaaaaalr","aaaaaaaaaaaaaals","aaaaaaaaaaaaaalt","aaaaaaaaaaaaaalu","aaaaaaaaaaaaaalv","aaaaaaaaaaaaaalw","aaaaaaaaaaaaaalx","aaaaaaaaaaaaaaly","aaaaaaaaaaaaaalz","aaaaaaaaaaaaaama","aaaaaaaaaaaaaamb","aaaaaaaaaaaaaamc","aaaaaaaaaaaaaamd","aaaaaaaaaaaaaame","aaaaaaaaaaaaaamf","aaaaaaaaaaaaaamg","aaaaaaaaaaaaaamh","aaaaaaaaaaaaaami","aaaaaaaaaaaaaamj","aaaaaaaaaaaaaamk","aaaaaaaaaaaaaaml","aaaaaaaaaaaaaamm","aaaaaaaaaaaaaamn","aaaaaaaaaaaaaamo","aaaaaaaaaaaaaamp","aaaaaaaaaaaaaamq","aaaaaaaaaaaaaamr","aaaaaaaaaaaaaams","aaaaaaaaaaaaaamt","aaaaaaaaaaaaaamu","aaaaaaaaaaaaaamv","aaaaaaaaaaaaaamw","aaaaaaaaaaaaaamx","aaaaaaaaaaaaaamy","aaaaaaaaaaaaaamz","aaaaaaaaaaaaaana","aaaaaaaaaaaaaanb","aaaaaaaaaaaaaanc","aaaaaaaaaaaaaand","aaaaaaaaaaaaaane","aaaaaaaaaaaaaanf","aaaaaaaaaaaaaang","aaaaaaaaaaaaaanh","aaaaaaaaaaaaaani","aaaaaaaaaaaaaanj","aaaaaaaaaaaaaank","aaaaaaaaaaaaaanl","aaaaaaaaaaaaaanm","aaaaaaaaaaaaaann","aaaaaaaaaaaaaano","aaaaaaaaaaaaaanp","aaaaaaaaaaaaaanq","aaaaaaaaaaaaaanr","aaaaaaaaaaaaaans","aaaaaaaaaaaaaant","aaaaaaaaaaaaaanu","aaaaaaaaaaaaaanv","aaaaaaaaaaaaaanw","aaaaaaaaaaaaaanx","aaaaaaaaaaaaaany","aaaaaaaaaaaaaanz","aaaaaaaaaaaaaaoa","aaaaaaaaaaaaaaob","aaaaaaaaaaaaaaoc","aaaaaaaaaaaaaaod","aaaaaaaaaaaaaaoe","aaaaaaaaaaaaaaof","aaaaaaaaaaaaaaog","aaaaaaaaaaaaaaoh","aaaaaaaaaaaaaaoi","aaaaaaaaaaaaaaoj","aaaaaaaaaaaaaaok","aaaaaaaaaaaaaaol","aaaaaaaaaaaaaaom","aaaaaaaaaaaaaaon","aaaaaaaaaaaaaaoo","aaaaaaaaaaaaaaop","aaaaaaaaaaaaaaoq","aaaaaaaaaaaaaaor","aaaaaaaaaaaaaaos","aaaaaaaaaaaaaaot","aaaaaaaaaaaaaaou","aaaaaaaaaaaaaaov","aaaaaaaaaaaaaaow","aaaaaaaaaaaaaaox","aaaaaaaaaaaaaaoy","aaaaaaaaaaaaaaoz","aaaaaaaaaaaaaapa","aaaaaaaaaaaaaapb","aaaaaaaaaaaaaapc","aaaaaaaaaaaaaapd","aaaaaaaaaaaaaape","aaaaaaaaaaaaaapf","aaaaaaaaaaaaaapg","aaaaaaaaaaaaaaph","aaaaaaaaaaaaaapi","aaaaaaaaaaaaaapj","aaaaaaaaaaaaaapk","aaaaaaaaaaaaaapl","aaaaaaaaaaaaaapm","aaaaaaaaaaaaaapn","aaaaaaaaaaaaaapo","aaaaaaaaaaaaaapp","aaaaaaaaaaaaaapq","aaaaaaaaaaaaaapr","aaaaaaaaaaaaaaps","aaaaaaaaaaaaaapt","aaaaaaaaaaaaaapu","aaaaaaaaaaaaaapv","aaaaaaaaaaaaaapw","aaaaaaaaaaaaaapx","aaaaaaaaaaaaaapy","aaaaaaaaaaaaaapz","aaaaaaaaaaaaaaqa","aaaaaaaaaaaaaaqb","aaaaaaaaaaaaaaqc","aaaaaaaaaaaaaaqd","aaaaaaaaaaaaaaqe","aaaaaaaaaaaaaaqf","aaaaaaaaaaaaaaqg","aaaaaaaaaaaaaaqh","aaaaaaaaaaaaaaqi","aaaaaaaaaaaaaaqj","aaaaaaaaaaaaaaqk","aaaaaaaaaaaaaaql","aaaaaaaaaaaaaaqm","aaaaaaaaaaaaaaqn","aaaaaaaaaaaaaaqo","aaaaaaaaaaaaaaqp","aaaaaaaaaaaaaaqq","aaaaaaaaaaaaaaqr","aaaaaaaaaaaaaaqs","aaaaaaaaaaaaaaqt","aaaaaaaaaaaaaaqu","aaaaaaaaaaaaaaqv","aaaaaaaaaaaaaaqw","aaaaaaaaaaaaaaqx","aaaaaaaaaaaaaaqy","aaaaaaaaaaaaaaqz","aaaaaaaaaaaaaara","aaaaaaaaaaaaaarb","aaaaaaaaaaaaaarc","aaaaaaaaaaaaaard","aaaaaaaaaaaaaare","aaaaaaaaaaaaaarf","aaaaaaaaaaaaaarg","aaaaaaaaaaaaaarh","aaaaaaaaaaaaaari","aaaaaaaaaaaaaarj","aaaaaaaaaaaaaark","aaaaaaaaaaaaaarl","aaaaaaaaaaaaaarm","aaaaaaaaaaaaaarn","aaaaaaaaaaaaaaro","aaaaaaaaaaaaaarp","aaaaaaaaaaaaaarq","aaaaaaaaaaaaaarr","aaaaaaaaaaaaaars","aaaaaaaaaaaaaart","aaaaaaaaaaaaaaru","aaaaaaaaaaaaaarv","aaaaaaaaaaaaaarw","aaaaaaaaaaaaaarx","aaaaaaaaaaaaaary","aaaaaaaaaaaaaarz","aaaaaaaaaaaaaasa","aaaaaaaaaaaaaasb","aaaaaaaaaaaaaasc","aaaaaaaaaaaaaasd","aaaaaaaaaaaaaase","aaaaaaaaaaaaaasf","aaaaaaaaaaaaaasg","aaaaaaaaaaaaaash","aaaaaaaaaaaaaasi","aaaaaaaaaaaaaasj","aaaaaaaaaaaaaask","aaaaaaaaaaaaaasl","aaaaaaaaaaaaaasm","aaaaaaaaaaaaaasn","aaaaaaaaaaaaaaso","aaaaaaaaaaaaaasp","aaaaaaaaaaaaaasq","aaaaaaaaaaaaaasr","aaaaaaaaaaaaaass","aaaaaaaaaaaaaast","aaaaaaaaaaaaaasu","aaaaaaaaaaaaaasv","aaaaaaaaaaaaaasw","aaaaaaaaaaaaaasx","aaaaaaaaaaaaaasy","aaaaaaaaaaaaaasz","aaaaaaaaaaaaaata","aaaaaaaaaaaaaatb","aaaaaaaaaaaaaatc","aaaaaaaaaaaaaatd","aaaaaaaaaaaaaate","aaaaaaaaaaaaaatf","aaaaaaaaaaaaaatg","aaaaaaaaaaaaaath","aaaaaaaaaaaaaati","aaaaaaaaaaaaaatj","aaaaaaaaaaaaaatk","aaaaaaaaaaaaaatl","aaaaaaaaaaaaaatm","aaaaaaaaaaaaaatn","aaaaaaaaaaaaaato","aaaaaaaaaaaaaatp","aaaaaaaaaaaaaatq","aaaaaaaaaaaaaatr","aaaaaaaaaaaaaats","aaaaaaaaaaaaaatt","aaaaaaaaaaaaaatu","aaaaaaaaaaaaaatv","aaaaaaaaaaaaaatw","aaaaaaaaaaaaaatx","aaaaaaaaaaaaaaty","aaaaaaaaaaaaaatz","aaaaaaaaaaaaaaua","aaaaaaaaaaaaaaub","aaaaaaaaaaaaaauc","aaaaaaaaaaaaaaud","aaaaaaaaaaaaaaue","aaaaaaaaaaaaaauf","aaaaaaaaaaaaaaug","aaaaaaaaaaaaaauh","aaaaaaaaaaaaaaui","aaaaaaaaaaaaaauj","aaaaaaaaaaaaaauk","aaaaaaaaaaaaaaul","aaaaaaaaaaaaaaum","aaaaaaaaaaaaaaun","aaaaaaaaaaaaaauo","aaaaaaaaaaaaaaup","aaaaaaaaaaaaaauq","aaaaaaaaaaaaaaur","aaaaaaaaaaaaaaus","aaaaaaaaaaaaaaut","aaaaaaaaaaaaaauu","aaaaaaaaaaaaaauv","aaaaaaaaaaaaaauw","aaaaaaaaaaaaaaux","aaaaaaaaaaaaaauy","aaaaaaaaaaaaaauz","aaaaaaaaaaaaaava","aaaaaaaaaaaaaavb","aaaaaaaaaaaaaavc","aaaaaaaaaaaaaavd","aaaaaaaaaaaaaave","aaaaaaaaaaaaaavf","aaaaaaaaaaaaaavg","aaaaaaaaaaaaaavh","aaaaaaaaaaaaaavi","aaaaaaaaaaaaaavj","aaaaaaaaaaaaaavk","aaaaaaaaaaaaaavl","aaaaaaaaaaaaaavm","aaaaaaaaaaaaaavn","aaaaaaaaaaaaaavo","aaaaaaaaaaaaaavp","aaaaaaaaaaaaaavq","aaaaaaaaaaaaaavr","aaaaaaaaaaaaaavs","aaaaaaaaaaaaaavt","aaaaaaaaaaaaaavu","aaaaaaaaaaaaaavv","aaaaaaaaaaaaaavw","aaaaaaaaaaaaaavx","aaaaaaaaaaaaaavy","aaaaaaaaaaaaaavz","aaaaaaaaaaaaaawa","aaaaaaaaaaaaaawb","aaaaaaaaaaaaaawc","aaaaaaaaaaaaaawd","aaaaaaaaaaaaaawe","aaaaaaaaaaaaaawf","aaaaaaaaaaaaaawg","aaaaaaaaaaaaaawh","aaaaaaaaaaaaaawi","aaaaaaaaaaaaaawj","aaaaaaaaaaaaaawk","aaaaaaaaaaaaaawl","aaaaaaaaaaaaaawm","aaaaaaaaaaaaaawn","aaaaaaaaaaaaaawo","aaaaaaaaaaaaaawp","aaaaaaaaaaaaaawq","aaaaaaaaaaaaaawr","aaaaaaaaaaaaaaws","aaaaaaaaaaaaaawt","aaaaaaaaaaaaaawu","aaaaaaaaaaaaaawv","aaaaaaaaaaaaaaww","aaaaaaaaaaaaaawx","aaaaaaaaaaaaaawy","aaaaaaaaaaaaaawz","aaaaaaaaaaaaaaxa","aaaaaaaaaaaaaaxb","aaaaaaaaaaaaaaxc","aaaaaaaaaaaaaaxd","aaaaaaaaaaaaaaxe","aaaaaaaaaaaaaaxf","aaaaaaaaaaaaaaxg","aaaaaaaaaaaaaaxh","aaaaaaaaaaaaaaxi","aaaaaaaaaaaaaaxj","aaaaaaaaaaaaaaxk","aaaaaaaaaaaaaaxl","aaaaaaaaaaaaaaxm","aaaaaaaaaaaaaaxn","aaaaaaaaaaaaaaxo","aaaaaaaaaaaaaaxp","aaaaaaaaaaaaaaxq","aaaaaaaaaaaaaaxr","aaaaaaaaaaaaaaxs","aaaaaaaaaaaaaaxt","aaaaaaaaaaaaaaxu","aaaaaaaaaaaaaaxv","aaaaaaaaaaaaaaxw","aaaaaaaaaaaaaaxx","aaaaaaaaaaaaaaxy","aaaaaaaaaaaaaaxz","aaaaaaaaaaaaaaya","aaaaaaaaaaaaaayb","aaaaaaaaaaaaaayc","aaaaaaaaaaaaaayd","aaaaaaaaaaaaaaye","aaaaaaaaaaaaaayf","aaaaaaaaaaaaaayg","aaaaaaaaaaaaaayh","aaaaaaaaaaaaaayi","aaaaaaaaaaaaaayj","aaaaaaaaaaaaaayk","aaaaaaaaaaaaaayl","aaaaaaaaaaaaaaym","aaaaaaaaaaaaaayn","aaaaaaaaaaaaaayo","aaaaaaaaaaaaaayp","aaaaaaaaaaaaaayq","aaaaaaaaaaaaaayr","aaaaaaaaaaaaaays","aaaaaaaaaaaaaayt","aaaaaaaaaaaaaayu","aaaaaaaaaaaaaayv","aaaaaaaaaaaaaayw","aaaaaaaaaaaaaayx","aaaaaaaaaaaaaayy","aaaaaaaaaaaaaayz","aaaaaaaaaaaaaaza","aaaaaaaaaaaaaazb","aaaaaaaaaaaaaazc","aaaaaaaaaaaaaazd","aaaaaaaaaaaaaaze","aaaaaaaaaaaaaazf","aaaaaaaaaaaaaazg","aaaaaaaaaaaaaazh","aaaaaaaaaaaaaazi","aaaaaaaaaaaaaazj","aaaaaaaaaaaaaazk","aaaaaaaaaaaaaazl","aaaaaaaaaaaaaazm","aaaaaaaaaaaaaazn","aaaaaaaaaaaaaazo","aaaaaaaaaaaaaazp","aaaaaaaaaaaaaazq","aaaaaaaaaaaaaazr","aaaaaaaaaaaaaazs","aaaaaaaaaaaaaazt","aaaaaaaaaaaaaazu","aaaaaaaaaaaaaazv","aaaaaaaaaaaaaazw","aaaaaaaaaaaaaazx","aaaaaaaaaaaaaazy","aaaaaaaaaaaaaazz","aaaaaaaaaaaaaaaa","aaaaaaaaaaaaaaab","aaaaaaaaaaaaaaac","aaaaaaaaaaaaaaad","aaaaaaaaaaaaaaae","aaaaaaaaaaaaaaaf","aaaaaaaaaaaaaaag","aaaaaaaaaaaaaaah","aaaaaaaaaaaaaaai","aaaaaaaaaaaaaaaj","aaaaaaaaaaaaaaak","aaaaaaaaaaaaaaal","aaaaaaaaaaaaaaam","aaaaaaaaaaaaaaan","aaaaaaaaaaaaaaao","aaaaaaaaaaaaaaap","aaaaaaaaaaaaaaaq","aaaaaaaaaaaaaaar","aaaaaaaaaaaaaaas","aaaaaaaaaaaaaaat","aaaaaaaaaaaaaaau","aaaaaaaaaaaaaaav","aaaaaaaaaaaaaaaw","aaaaaaaaaaaaaaax","aaaaaaaaaaaaaaay","aaaaaaaaaaaaaaaz","aaaaaaaaaaaaaaba","aaaaaaaaaaaaaabb","aaaaaaaaaaaaaabc","aaaaaaaaaaaaaabd","aaaaaaaaaaaaaabe","aaaaaaaaaaaaaabf","aaaaaaaaaaaaaabg","aaaaaaaaaaaaaabh","aaaaaaaaaaaaaabi","aaaaaaaaaaaaaabj","aaaaaaaaaaaaaabk","aaaaaaaaaaaaaabl","aaaaaaaaaaaaaabm","aaaaaaaaaaaaaabn","aaaaaaaaaaaaaabo","aaaaaaaaaaaaaabp","aaaaaaaaaaaaaabq","aaaaaaaaaaaaaabr","aaaaaaaaaaaaaabs","aaaaaaaaaaaaaabt","aaaaaaaaaaaaaabu","aaaaaaaaaaaaaabv","aaaaaaaaaaaaaabw","aaaaaaaaaaaaaabx","aaaaaaaaaaaaaaby","aaaaaaaaaaaaaabz","aaaaaaaaaaaaaaca","aaaaaaaaaaaaaacb","aaaaaaaaaaaaaacc","aaaaaaaaaaaaaacd","aaaaaaaaaaaaaace","aaaaaaaaaaaaaacf","aaaaaaaaaaaaaacg","aaaaaaaaaaaaaach","aaaaaaaaaaaaaaci","aaaaaaaaaaaaaacj","aaaaaaaaaaaaaack","aaaaaaaaaaaaaacl","aaaaaaaaaaaaaacm","aaaaaaaaaaaaaacn","aaaaaaaaaaaaaaco","aaaaaaaaaaaaaacp","aaaaaaaaaaaaaacq","aaaaaaaaaaaaaacr","aaaaaaaaaaaaaacs","aaaaaaaaaaaaaact","aaaaaaaaaaaaaacu","aaaaaaaaaaaaaacv","aaaaaaaaaaaaaacw","aaaaaaaaaaaaaacx","aaaaaaaaaaaaaacy","aaaaaaaaaaaaaacz","aaaaaaaaaaaaaada","aaaaaaaaaaaaaadb","aaaaaaaaaaaaaadc","aaaaaaaaaaaaaadd","aaaaaaaaaaaaaade","aaaaaaaaaaaaaadf","aaaaaaaaaaaaaadg","aaaaaaaaaaaaaadh","aaaaaaaaaaaaaadi","aaaaaaaaaaaaaadj","aaaaaaaaaaaaaadk","aaaaaaaaaaaaaadl","aaaaaaaaaaaaaadm","aaaaaaaaaaaaaadn","aaaaaaaaaaaaaado","aaaaaaaaaaaaaadp","aaaaaaaaaaaaaadq","aaaaaaaaaaaaaadr","aaaaaaaaaaaaaads","aaaaaaaaaaaaaadt","aaaaaaaaaaaaaadu","aaaaaaaaaaaaaadv","aaaaaaaaaaaaaadw","aaaaaaaaaaaaaadx","aaaaaaaaaaaaaady","aaaaaaaaaaaaaadz","aaaaaaaaaaaaaaea","aaaaaaaaaaaaaaeb","aaaaaaaaaaaaaaec","aaaaaaaaaaaaaaed","aaaaaaaaaaaaaaee","aaaaaaaaaaaaaaef","aaaaaaaaaaaaaaeg","aaaaaaaaaaaaaaeh","aaaaaaaaaaaaaaei","aaaaaaaaaaaaaaej","aaaaaaaaaaaaaaek","aaaaaaaaaaaaaael","aaaaaaaaaaaaaaem","aaaaaaaaaaaaaaen","aaaaaaaaaaaaaaeo","aaaaaaaaaaaaaaep","aaaaaaaaaaaaaaeq","aaaaaaaaaaaaaaer","aaaaaaaaaaaaaaes","aaaaaaaaaaaaaaet","aaaaaaaaaaaaaaeu","aaaaaaaaaaaaaaev","aaaaaaaaaaaaaaew","aaaaaaaaaaaaaaex","aaaaaaaaaaaaaaey","aaaaaaaaaaaaaaez","aaaaaaaaaaaaaafa","aaaaaaaaaaaaaafb","aaaaaaaaaaaaaafc","aaaaaaaaaaaaaafd","aaaaaaaaaaaaaafe","aaaaaaaaaaaaaaff","aaaaaaaaaaaaaafg","aaaaaaaaaaaaaafh","aaaaaaaaaaaaaafi","aaaaaaaaaaaaaafj","aaaaaaaaaaaaaafk","aaaaaaaaaaaaaafl","aaaaaaaaaaaaaafm","aaaaaaaaaaaaaafn","aaaaaaaaaaaaaafo","aaaaaaaaaaaaaafp","aaaaaaaaaaaaaafq","aaaaaaaaaaaaaafr","aaaaaaaaaaaaaafs","aaaaaaaaaaaaaaft","aaaaaaaaaaaaaafu","aaaaaaaaaaaaaafv","aaaaaaaaaaaaaafw","aaaaaaaaaaaaaafx","aaaaaaaaaaaaaafy","aaaaaaaaaaaaaafz","aaaaaaaaaaaaaaga","aaaaaaaaaaaaaagb","aaaaaaaaaaaaaagc","aaaaaaaaaaaaaagd","aaaaaaaaaaaaaage","aaaaaaaaaaaaaagf","aaaaaaaaaaaaaagg","aaaaaaaaaaaaaagh","aaaaaaaaaaaaaagi","aaaaaaaaaaaaaagj","aaaaaaaaaaaaaagk","aaaaaaaaaaaaaagl","aaaaaaaaaaaaaagm","aaaaaaaaaaaaaagn","aaaaaaaaaaaaaago","aaaaaaaaaaaaaagp","aaaaaaaaaaaaaagq","aaaaaaaaaaaaaagr","aaaaaaaaaaaaaags","aaaaaaaaaaaaaagt","aaaaaaaaaaaaaagu","aaaaaaaaaaaaaagv","aaaaaaaaaaaaaagw","aaaaaaaaaaaaaagx","aaaaaaaaaaaaaagy","aaaaaaaaaaaaaagz","aaaaaaaaaaaaaaha","aaaaaaaaaaaaaahb","aaaaaaaaaaaaaahc","aaaaaaaaaaaaaahd","aaaaaaaaaaaaaahe","aaaaaaaaaaaaaahf","aaaaaaaaaaaaaahg","aaaaaaaaaaaaaahh","aaaaaaaaaaaaaahi","aaaaaaaaaaaaaahj","aaaaaaaaaaaaaahk","aaaaaaaaaaaaaahl","aaaaaaaaaaaaaahm","aaaaaaaaaaaaaahn","aaaaaaaaaaaaaaho","aaaaaaaaaaaaaahp","aaaaaaaaaaaaaahq","aaaaaaaaaaaaaahr","aaaaaaaaaaaaaahs","aaaaaaaaaaaaaaht","aaaaaaaaaaaaaahu","aaaaaaaaaaaaaahv","aaaaaaaaaaaaaahw","aaaaaaaaaaaaaahx","aaaaaaaaaaaaaahy","aaaaaaaaaaaaaahz","aaaaaaaaaaaaaaia","aaaaaaaaaaaaaaib","aaaaaaaaaaaaaaic","aaaaaaaaaaaaaaid","aaaaaaaaaaaaaaie","aaaaaaaaaaaaaaif","aaaaaaaaaaaaaaig","aaaaaaaaaaaaaaih","aaaaaaaaaaaaaaii","aaaaaaaaaaaaaaij","aaaaaaaaaaaaaaik","aaaaaaaaaaaaaail","aaaaaaaaaaaaaaim","aaaaaaaaaaaaaain","aaaaaaaaaaaaaaio","aaaaaaaaaaaaaaip","aaaaaaaaaaaaaaiq","aaaaaaaaaaaaaair","aaaaaaaaaaaaaais","aaaaaaaaaaaaaait","aaaaaaaaaaaaaaiu","aaaaaaaaaaaaaaiv","aaaaaaaaaaaaaaiw","aaaaaaaaaaaaaaix","aaaaaaaaaaaaaaiy","aaaaaaaaaaaaaaiz","aaaaaaaaaaaaaaja","aaaaaaaaaaaaaajb","aaaaaaaaaaaaaajc","aaaaaaaaaaaaaajd","aaaaaaaaaaaaaaje","aaaaaaaaaaaaaajf","aaaaaaaaaaaaaajg","aaaaaaaaaaaaaajh","aaaaaaaaaaaaaaji","aaaaaaaaaaaaaajj","aaaaaaaaaaaaaajk","aaaaaaaaaaaaaajl","aaaaaaaaaaaaaajm","aaaaaaaaaaaaaajn","aaaaaaaaaaaaaajo","aaaaaaaaaaaaaajp","aaaaaaaaaaaaaajq","aaaaaaaaaaaaaajr","aaaaaaaaaaaaaajs","aaaaaaaaaaaaaajt","aaaaaaaaaaaaaaju","aaaaaaaaaaaaaajv","aaaaaaaaaaaaaajw","aaaaaaaaaaaaaajx","aaaaaaaaaaaaaajy","aaaaaaaaaaaaaajz","aaaaaaaaaaaaaaka","aaaaaaaaaaaaaakb","aaaaaaaaaaaaaakc","aaaaaaaaaaaaaakd","aaaaaaaaaaaaaake","aaaaaaaaaaaaaakf","aaaaaaaaaaaaaakg","aaaaaaaaaaaaaakh","aaaaaaaaaaaaaaki","aaaaaaaaaaaaaakj","aaaaaaaaaaaaaakk","aaaaaaaaaaaaaakl","aaaaaaaaaaaaaakm","aaaaaaaaaaaaaakn","aaaaaaaaaaaaaako","aaaaaaaaaaaaaakp","aaaaaaaaaaaaaakq","aaaaaaaaaaaaaakr","aaaaaaaaaaaaaaks","aaaaaaaaaaaaaakt","aaaaaaaaaaaaaaku","aaaaaaaaaaaaaakv","aaaaaaaaaaaaaakw","aaaaaaaaaaaaaakx","aaaaaaaaaaaaaaky","aaaaaaaaaaaaaakz","aaaaaaaaaaaaaala","aaaaaaaaaaaaaalb","aaaaaaaaaaaaaalc","aaaaaaaaaaaaaald","aaaaaaaaaaaaaale","aaaaaaaaaaaaaalf","aaaaaaaaaaaaaalg","aaaaaaaaaaaaaalh","aaaaaaaaaaaaaali","aaaaaaaaaaaaaalj","aaaaaaaaaaaaaalk","aaaaaaaaaaaaaall"]
// Code
/*
class Solution {
public:
int row,col;
int targetk;
string str;
int dx[4]={-1,0,1,0};
int dy[4]={0,-1,0,1};
char used='#';
vector< vector > grid;
vector< vector > origin;
vector< string> ans;
bool flag;
vector findWords(vector< vector >& board, vector& words)
{
row=board.size();
if (row==0) return ans;
col=board[0].size();
grid.resize(row+2);
for(int i=0;i<=col+1;i++)
grid[0].push_back(used);
for(int i=0;i tmpw;
map repeat;
for(int t=0;t
84 Largest Rectangle in Histogram
// -------------------- Seeing Discuss ----------
/*
copying codes
url
https://discuss.leetcode.com/topic/14406/my-concise-code-20ms-stack-based-o-n-one-trick-used
Analysis:
The idea is simple, use a stack to save the index of each vector entry in a ascending order;
once the current entry is smaller than the one with the index s.top(), then that means the
rectangle with the height height[s.top()] ends at the current position, so calculate its area
and update the maximum.
The only trick I use to avoid checking whether the stack is empty (due to pop) and also avoiding
emptying the stack at the end (i.e. after going through the vector, s is not empty and we have to
consider those in the stack) is to put a dummy "0" at the beginning of vector "height" and the end
of "height": the first one makes sure the stack will never be empty (since all the height entries are >=0)
and the last one will flush all the remaining non-zero entries of the stack at the end of "for" iteration.
This trick helps us keep the code concise.
*/
class Solution {
public:
int largestRectangleArea(vector& heights)
{
heights.insert(heights.begin(),0);
heights.push_back(0);
int len = heights.size();
int i ,res = 0,idx;
stack s;
s.push(0);
for(i=1;i& heights)
{
int ans = 0;
int lh = heights.size();
int lhm = lh -1;
int left,right;
for(int i=0;i0 && heights[left]>=heights[i])
left--;
if (heights[left]=heights[i])
right++;
if (heights[right]ans) ans=nums;
}
return ans;
}
};
*/ 130 Surrounded Regions
// ----------------Seeing Discuss-----------
/*
copying codes
url
https://discuss.leetcode.com/topic/17224/a-really-simple-and-readable-c-solution-only-cost-12ms
Analysis:
First, check the four border of the matrix. If there is a element is
'O', alter it and all its neighbor 'O' elements to '1'.
Then ,alter all the 'O' to 'X'
At last,alter all the '1' to 'O'
， O， O 。
， O O。
：
， ， 。
。
*/
class Solution {
public:
void solve(vector >& board)
{
int i,j;
int row = board.size();
if(!row) return ;
int col=board[0].size();
for(i=0;i1)
check(board,i,col-1,row,col);
}
for(j=1;j+11)
check(board,row-1,j,row,col);
}
for(i=0;i >&vec,int i,int j,int row,int col)
{
if(vec[i][j]=='O')
{
vec[i][j]='1';
if(i>1) check(vec,i-1,j,row,col);
if(j>1) check(vec,i,j-1,row,col);
if(i+1|
218 The Skyline Problem
// ------------------- Seeing Discuss ---------------
/*
copying codes
url
https://discuss.leetcode.com/topic/25794/17-line-o-n-log-n-time-o-n-space-c-accepted-easy-solution-w-explanations
Analysis:
Step 1:
Use a multimap to sort all boundary points. For a start point of an interval,
let the height be positive; otherwise, let the height be negative. Time complexity: O(n log n)
Step 2:
Use a multiset (rather than a heap/priority_queue) to maintain the current set of heights
to be considered. If a new start point is met, insert the height into the set, otherwise,
delete the height. The current max height is the back() element of the multiset.
For each point, the time complexity is O(log n). The overall time complexity is O(n log n).
Step 3:
Delete the points with equal heights. Time: O(n)
Time Complexity: O(n log n)
Space Complexity: O(n)
*/
class Solution {
public:
vector > getSkyline(vector>& buildings)
{
multimap coords;
for(const vector & building:buildings)
{
coords.emplace(building[0],building[2]);
coords.emplace(building[1],-building[2]);
}
multiset heights ={0};
vector > corners;
int x = -1;
int y = 0;
for(const pair &p : coords)
{
if((x>=0)&&(p.first!=x)&&(corners.empty() || (corners.rbegin()->second !=y)))
{
corners.emplace_back(x,y);
}
if(p.second>=0)
{
heights.insert(p.second);
}
else
{
heights.erase(heights.find(-p.second));
}
x=p.first;
y=*heights.rbegin();
}
if(!corners.empty()) corners.emplace_back(x,0);
return corners;
}
};