Submission #651330

#	Time	Username	Problem	Language	Result	Execution time	Memory
651330		Markomafko972	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	206 ms	88504 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
using namespace std;

char c[3005][3005];
int d[3005][3005];
int r[3005][3005];

int main () {
	
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	
	int n, m;
	cin >> n >> m;
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < m; j++) {
			cin >> c[i][j];
		}
	}
	
	for (int i = n-1; i >= 0; i--) {
		for (int j = m-1; j >= 0; j--) {
			d[i][j] = d[i+1][j];
			if (c[i][j] == 'I') d[i][j]++;
			
			r[i][j] = r[i][j+1];
			if (c[i][j] == 'O') r[i][j]++;
		}
	}
	
	long long sol = 0;
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < m; j++) {
			if (c[i][j] == 'J') {
				sol += (long long)d[i][j] * (long long)r[i][j];
			}
		}
	}
	cout << sol;
	
	return 0;
}

• Subtask 1: 20 / 20
• Subtask 2: 30 / 30
• Subtask 3: 50 / 50