Unique Paths II @ LeetCode (Python)
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Minimum Path Sum @ LeetCode (Python)

kitt posted @ 2014年3月13日 01:30 in LeetCode , 2143 阅读

动态规划, 这道题和Unique Paths II如出一辙。

class Solution:
    # @param grid, a list of lists of integers
    # @return an integer
    def minPathSum(self, grid):
        rows = len(grid)
        cols = len(grid[0])
        # initialization
        dp = [[0 for j in xrange(cols)] for i in xrange(rows)]
        dp[0][0] = grid[0][0]
        for i in xrange(1, cols):
            dp[0][i] = dp[0][i - 1] + grid[0][i]
        for i in xrange(1, rows):
            dp[i][0] = dp[i - 1][0] + grid[i][0]
        # dynamic programming
        for i in xrange(1, rows):
            for j in xrange(1, cols):
                dp[i][j] = min(dp[i - 1][j], dp[i][j - 1]) + grid[i][j]
        return dp[rows - 1][cols - 1]
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2022年9月17日 12:51

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