Tontti

public class Tonts {
	static String[] str;
	
	public static int getTreeCount(int startx, int starty, int scope) {
		int result = 0;
		
		for(int i = starty; i < starty + scope; i++)
			result += str[i].substring(startx, startx + scope).replace(".", "").length();
		
		return result;
	}
	
	public static void main(String[] args) {
		IO oi = new IO();
		
		int height = oi.nextInt(),
				width = oi.nextInt(),
				treesWanted = oi.nextInt();
		
		str = new String[height];
		for(int i = 0; i < height; i++) str[i] = oi.next();
		
		int minScope = (int) Math.ceil(Math.sqrt(treesWanted)),
				maxScope = height < width ? height : width;
		
		int result = 0;
		
		for(int scope = minScope; scope <= maxScope; scope++) {
			for(int x = 0; x <= width - scope; x++) {
				for(int y = 0; y <= height - scope; y++) {
					if(getTreeCount(x, y, scope) == treesWanted) result++;
				}
			}
		}
		
		oi.println(result);
		
		oi.close();
	}
}

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