2022.07.24 (lc_6125_equal row and column pairs)

  Method ： Violent solution

class Solution {
    public int equalPairs(int[][] grid) {
        int n = grid.length;
        List<int[]> rows = new ArrayList<>();
        List<int[]> cols = new ArrayList<>();
        // That's ok 
        for (int[] row : grid) {
            rows.add(row);
        }
        // Column 
        for (int i = 0; i < n; i++) {
            int[] col = new int[n];
            for (int j = 0; j < n; j++) {
                col[j] = grid[j][i];
            }
            cols.add(col);
        }
        // Compare each row and column 
        int ans = 0;
        for (int[] row : rows) {
            for (int[] col : cols) {
                boolean flag = true;
                for (int i = 0; i < n; i++) {
                    if (row[i] != col[i]) {
                        flag = false;
                        break;
                    }
                }
                if (flag) {
                    ans++;
                }
            }
        }
        return ans;
    }
}

class Solution {
    public int equalPairs(int[][] grid) {
        int ans = 0;
        int n = grid.length;
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < n; j++) {
                boolean flag = true;
                for (int k = 0; k < n; k++) {
                    if (grid[i][k] != grid[k][j]) {
                        flag = false;
                        break;
                    }
                }
                if (flag) {
                    ans++;
                }
            }
        }
        return ans;
    }
}