Tontti

#include <iostream>
#include <vector>
using namespace std;

int main(int argc, char** argv) {
    int n, m, x;
    cin >> n >> m >> x;
    int r = 1;
    while (r*r < x) ++r;
    vector<string> w;
    string s;
    int kk = 0;
    for (int i = 0; i < n; ++i){
        cin >> s;
        w.push_back(s);
        if (i < r-1){
            for(int j = 0; j < r-1; ++j){
                if (s[j] == '*') ++kk;
            }
        }
    }
    int v = 0;
    for(; r < (n < m ? n : m); ++r){
        int k = kk;
        for(int i = 0; i <= n-r; ++i){
            for(int j = 0; j < r-1; ++j){
                if (i > 0) {if (w.at(i-1)[j] == '*') {--k;}}
                if (w.at(i+r-1)[j] == '*') {++k;}
            }
            int t = k;
            for (int j = 0; j <= m-r; ++j){
                for(int q = i; q < i+r; ++q){
                    if(j > 0) {if (w.at(q)[j-1] == '*') {--t;}}
                    if (w.at(q)[j+r-1] == '*') {++t;}
                }
                if (i == 0 && j == 0) kk = t;
                if (t == x) ++v;
            }
        }
    }
    cout << v;
    return 0;
}

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: TIME LIMIT EXCEEDED

Test 7

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 8

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 9

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 10

Group: 2

Verdict: TIME LIMIT EXCEEDED

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