不同路径

[Pcjmy]

No description provided.

[lxy-Jason]

/**
 * @param {number} m
 * @param {number} n
 * @return {number}
 */
var uniquePaths = function(m, n) {
    let dp = new Array(m).fill(0).map(() => new Array(n).fill(0))
    for(let i = 0; i < m; i++){
        dp[i][0] = 1
    }
    for(let i = 0; i < n; i++){
        dp[0][i] = 1
    }
    for(let i = 1; i < m; i++){
        for(let j = 1; j < n; j++){
            dp[i][j] = dp[i - 1][j] + dp[i][j - 1]
        }
    }
    return dp[m - 1][n - 1]
};