javascriptよくある並べ替えアルゴリズムのまとめ
6377 ワード
javascriptよくある並べ替えアルゴリズムの総括アルゴリズムはプログラムの魂です.フロントエンドの開発環境では、並べ替えアルゴリズムはあまり使われていませんが、一般的な並べ替えアルゴリズムはやはりマスターすべきです.私はここでネットでよくある並べ替えアルゴリズムを整理しました.Javascriptが実現しました.後で調べるのに便利です.
並べ替え:
並べ替え:
function merge(left, right){
var result = [],
il = 0,
ir = 0;
while (il < left.length && ir < right.length){
if (left[il] < right[ir]){
result.push(left[il++]);
} else {
result.push(right[ir++]);
}
}
return result.concat(left.slice(il)).concat(right.slice(ir));
}function mergeSort(items){
// : 2
if (items.length < 2) {
return items;
}
var middle = Math.floor(items.length / 2),
left = items.slice(0, middle),
right = items.slice(middle);
return merge(mergeSort(left), mergeSort(right));
}function mergeSort2(items){
if (items.length < 2) {
return items;
}
var middle = Math.floor(items.length / 2),
left = items.slice(0, middle),
right = items.slice(middle),
params = merge(mergeSort(left), mergeSort(right));
params.unshift(0, items.length);
items.splice.apply(items, params);
return items;
}function insertionSort(items) {
var len = items.length,
value,
i,
j;
for (i=0; i < len; i++) {
value = items[i];
for (j=i-1; j > -1 && items[j] > value; j--) {
items[j+1] = items[j];
}
items[j+1] = value;
}
return items;
}function swap(items, firstIndex, secondIndex){
var temp = items[firstIndex];
items[firstIndex] = items[secondIndex];
items[secondIndex] = temp;
}function selectionSort(items){
var len = items.length,
min;
for (i=0; i < len; i++){
min = i;
for (j=i+1; j < len; j++){
if (items[j] < items[min]){
min = j;
}
}
if (i != min){
swap(items, i, min);
}
}
return items;
}function swap(items, firstIndex, secondIndex){
var temp = items[firstIndex];
items[firstIndex] = items[secondIndex];
items[secondIndex] = temp;
}function bubbleSort(items){
var len = items.length,
i, j, stop;
for (i=0; i < len; i++){
for (j=0, stop=len-i; j < stop; j++){
if (items[j] > items[j+1]){
swap(items, j, j+1);
}
}
}
return items;
}var quickSort = function(arr) {
if (arr.length <= 1) { return arr; }
var pivotIndex = Math.floor(arr.length / 2);
var pivot = arr.splice(pivotIndex, 1)[0];
var left = [];
var right = [];
for (var i = 0; i < arr.length; i++){
if (arr[i] < pivot) {
left.push(arr[i]);
} else {
right.push(arr[i]);
}
}
return quickSort(left).concat([pivot], quickSort(right));
};function binarySearch(items, value){
var startIndex = 0,
stopIndex = items.length - 1,
middle = Math.floor((stopIndex + startIndex)/2);
while(items[middle] != value && startIndex < stopIndex){
if (value < items[middle]){
stopIndex = middle - 1;
} else if (value > items[middle]){
startIndex = middle + 1;
}
middle = Math.floor((stopIndex + startIndex)/2);
}
return (items[middle] != value) ? -1 : middle;
}var countSort = function(array) {
var i, z = 0, count = [],
min = Math.min.apply({}, array),
max = Math.max.apply({}, array),
size = array.length;
//
for (i = min; i <= max; i++) {
count[i] = 0;
}
for (i=0; i < size; i++) {
count[array[i]]++;
}
for (i = min; i <= max; i++) {
while (count[i]-- > 0) {// ， ， i array
array[z++] = i;
}
}
return array;
}function shellSort(array) {
var j, i, v, h=1, s=3, k,n = array.length;
var result = "";
var count = 0;
while(h < n)
h=s*h+1;
while(h > 1) {
h=(h-1)/s;
for (k=0; k= 0 && array[j] > v)
array[j+h]=array[j];
else
break;
array[j+h]=v;
}
count++;
result += "
" + count + " :";
for (var n = 0; n < array.length; n++) {
result += array[n] + ",";
}
}
return result;
} var combSort = function(array){
var gap = array.length;
do{
gap = gap * 10 / 13
if(gap === 9 || gap === 10)
gap = 11
if(gap < 1){
gap = 1
}
var swapped = false;
for(var i=0;iarray[j]){
var temp = array[i];
array[i] = array[j];
array[j] = temp;
test(array)
swapped = true
}
}
if(gap == 1 && !swapped){
break;
}
}while(1);
} var cocktailSort= function(array) {
var top = array.length - 1, bottom = 0,flag = true,i, j;
while (flag) {
flag = false;
// ，
for (i = bottom; i < top; i++) {
if (array[i] > array[i + 1]) {
swap(array, i, i + 1);
flag = true;
}
}
top--;
// ，
for (j = top; j > bottom; j--) {
if (array[j] < array[j - 1]) {
swap(array, j, j - 1);
flag = true;
}
}
bottom++;
}
}
var swap = function(array,a,b){
var tmp = array[a];
array[a] = array[b]
array[b] = tmp;
}