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public class UniquePath {
    public int uniquePaths(int m, int n) {
      
        // add more comments
        if (m == 0 || n == 0) {
            return 0;
        }
         
        int[][] dp = new int[m][n];
         
        for (int i = 0; i < n; i++) {
            dp[0][i] = 1;
        }
         
        for (int i = 0; i < m; i++) {
            dp[i][0] = 1;
        }
         
        for (int i = 1; i < m; i++) {
            for (int j = 1; j < n; j++) {
                dp[i][j] = dp[i - 1][j] + dp[i][j - 1];
            }
        }
         
        return dp[m - 1][n - 1];
    }
}