var minPathSum = function (dp) {
  let row = dp.length,
    col = dp[0].length;

  for (
    let i = 1;
    i < row;
    i++ //初始化第一行
  )
    dp[i][0] += dp[i - 1][0];

  for (
    let j = 1;
    j < col;
    j++ //初始化第一列
  )
    dp[0][j] += dp[0][j - 1];

  for (let i = 1; i < row; i++) for (let j = 1; j < col; j++) dp[i][j] += Math.min(dp[i - 1][j], dp[i][j - 1]); //取上面和左边左小的

  return dp[row - 1][col - 1];
};