Tontti

#include <iostream>
#include <string>

int t[2001][2001];

int main() {
	int n, m, x;
	long r = 0;
	std::cin >> n >> m >> x;
	for (int i = 1; i <= n; ++i) {
		std::string s;
		std::cin >> s;
		for (int j = 1; j <= m; ++j) {
			t[i][j] = t[i-1][j] + t[i][j-1] - t[i-1][j-1] + (s[j-1] == '*' ? 1 : 0);
			for (int k = 1; k <= i && k <= j; ++k) {
				int p = t[i][j] - t[i-k][j] - t[i][j-k] + t[i-k][j-k];
				if (p > x) {
					break;
				}
				if (p == x) {
					r += 1;
				}
			}
		}
	}
	std::cout << r << std::endl;
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: ACCEPTED

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: ACCEPTED

Test 5

Group: 1

Verdict: ACCEPTED

Test 6

Group: 2

Verdict: ACCEPTED

Test 7

Group: 2

Verdict: ACCEPTED

Test 8

Group: 2

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: ACCEPTED

Test 10

Group: 2

Verdict: ACCEPTED

Test 11

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 12

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 13

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 14

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 15

Group: 3

Verdict: TIME LIMIT EXCEEDED