03. Squares in Matrix

#include <iostream>
#include <sstream>
#include <string>
#include <vector>

using namespace std;

int main() {
    int row, col;
    cin >> row >> col;
    cin.ignore();

    char chr;
    string line;

    vector<vector<char>> matrix;

    for (int i = 0; i < row; i++) {
        getline(cin, line);
        istringstream ss(line);
        vector<char> currentRow;

        while (ss >> chr) {
            currentRow.push_back(chr);
        }

        matrix.push_back(currentRow);
    }

    int counter = 0;

    for (int i = 0; i < row - 1; i++) {
        for (int j = 0; j < col - 1; j++) {
            chr = matrix[i][j];
            if (chr == matrix[i][j + 1] &&
                chr == matrix[i + 1][j] &&
                chr == matrix[i + 1][j + 1]) {
                counter++;
            }
        }
    }

    cout << counter << endl;
    return 0;
}