Tontti

#include <iostream>
#include <iterator>
#include <math.h>
#include <stdio.h>

using namespace std;

int main() {
	cin.sync_with_stdio(false);
	int i, j, n, m, k, x, q, w, o, p;
	int sz, s;
	cin >> n >> m >> k;
	char input[n][m];
	int kq = n*m;
	int a[kq];
	int f[kq];
	int y[kq];
	for (i = 0; i < n; i++)
		cin >> input[i];
	sz = (int)ceil(sqrt((double)k));
	x = 0;
	for (i = 0; i < n; i++)
		for (j = 0; j < m; j++) {
			a[i*m+j] = !(input[i][j]=='.');
			f[i*m+j] = 0;
			if(k<2)
				x += a[i*m+j]^k^1;
		}
	int c = max(sz,2);
	int g = 0, h = 0, d, z, first = 1, scale = 1;
	for (s = c; s <= min(n,m); s++) {
		z = s - 1;
		first = 1;
		if (s == c) {
			for (i = z; i < n; i++) {
				if (i > 0) {
					q = i * m;
					w = q - s * m;
					for (o = 0; o < s; o++, q++, w++)
						h += (a[q] - a[w]);
					g = h;
				}
				scale = 0;
				for (j = z; j < m; j++) {
					d = i*m+j;
					if (scale) {
						p = (i-z)*m+j;
						for (o = 0; o < s; o++, p+=m) {
							g += (a[p] - a[p-s]);
						}
					} else if (first) {
						first = 0;
						g = f[d];
						if (s == c) {
							o = s * m;
							for (q = 0; q < o; q+=m) {
								for (w = 0; w < s; w++) {
									g += a[q+w];
								}
							}
						} else {
							int iz = (i-z)*m, jz = j-z, iq = i * m, jq = j;
							for (q = 0; q < z; q++) {
								g += a[iz+jq] + a[iq+jz];
								iq-=m;jq--;
							}
							g += a[iz+jz];
						}
						h = g;
						scale = 1;
					} else
						scale = 1;
					f[d] = g;
					//printf("s:%d\ti:%d\tj:%d\tn:%d\tm:%d\tf:%d\n",s,i,j,n,m,f[d]);
					x += (g == k);
				}
			}
		} else {
			for (i = z; i < n; i++) {
				for (j = z; j < m; j++) {
					int d = i*m+j;
					int w = f[d-m-1] + a[d];
					q = m;
					for (o = 1; o < s; o++,q+=m)
						w += (a[d-o] + a[d-o*m]);
					if (w == k) x++;
					y[d] = w;
				}
			}
			for (i = 0; i < kq; i++)
				f[i] = y[i];
		}
		/*for (i = 0; i < n; i++) {
			for (j = 0; j < m; j++) {
				printf("%d",f[i*m+j]);
			}
			printf("\n");
		}
		printf("\n");*/
	}
	cout << x << "\n";
	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