Tontti

import java.util.ArrayList;

public class Main {

    private static int hits;

    public static void main(String[] args) {
        IO io = new IO();
        int height = io.nextInt();
        int width = io.nextInt();
        int trees = io.nextInt();
        hits = 0;

        //  HashMap<Integer,ArrayList<String>> woods = new HashMap<>();
        ArrayList<String> woods = new ArrayList<>();

        for (int i = 0; i < height; i++) {
            woods.add(io.next());
        }
        int smallest = height;
        if (height > width) {
            smallest = width;
        }

        iterateThroughAllSquares(width, height, smallest, woods, trees);

        io.println(hits);
        io.close();
    }

    private static void searchSquare(int startx, int starty, int size, ArrayList<String> woods, int trees) {
        int temphits = 0;
        int f1 = starty+size;
        int f2 = startx+size;
        
        for (int j = starty; j < f1; j++) {
            for (int i = startx; i < f2; i++) {
                if (woods.get(j).charAt(i) == '*') {
                    temphits++;

                }
            }
            
        }
        if (temphits == trees) {
            hits++;
        }
    }

    //in this function, the grid starts from 0,0 in the left upper corner

    private static void iterateThroughAllSquares(int width, int height, int size, ArrayList<String> woods, int trees) {
        int f3 = width - size;
        int f4 = height - size;
        for (int i = 0; i <= f3; i++) {
            for (int j = 0; j <= f4; j++) {
                searchSquare(i, j, size, woods, trees);

            }
        }
        //calls itself here
        size--;
        if (Math.pow(size, 2) >= trees) {
            iterateThroughAllSquares(width, height, size, woods, trees);
        }
    }
}

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