[アルゴリズム]CodeUp#4040:民宿

#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

int total_period = 0, room = 0; //여름 성수기 총 기간, 방 개수
int checkIn = 0, checkOut = 0;
char temp[101][31];

int greedy(int index) {
	int maxCount = 0;

	for (int i = 0; i < room; i++) {
		int count = 0;
		for (int j = index; j < checkOut - 1; j++) {
			if (temp[j][i] == 'O') { count++; }
			else { break; }
		}
		if (maxCount < count) {
			maxCount = count;
		}
	}
	return maxCount;
}

int main() {
	
	cin >> total_period >> room;

	for (int i = 0; i < total_period; i++) {
		for (int j = 0; j < room; j++) {
			cin >> temp[i][j];
		}
	}

	cin >> checkIn >> checkOut;

	int change = -1;
	for (int i = checkIn - 1; i < checkOut - 1;) {
		change++;

		if (greedy(i) == 0) {
			change = -1;
			break;
		}
		i += greedy(i);
	}
	cout << change << endl;;
		
	}