931. Minimum Falling Path Sum
- Minimum Falling Path Sum python solution
题目描述
Given a square array of integers A, we want the minimum sum of a falling path through A.
A falling path starts at any element in the first row, and chooses one element from each row. The next row’s choice must be in a column that is different from the previous row’s column by at most one.

解析
解题思路比较简单,一层层计算下来即可,见代码。
// An highlighted block
class Solution:
def minFallingPathSum(self, A):
"""
:type A: List[List[int]]
:rtype: int
"""
for i in range(1, len(A)):
for j in range(len(A[0])):
if j-1>=0:
topleft=A[i-1][j-1]
else:
topleft=float('inf')
if j+1<len(A[0]):
topright=A[i-1][j+1]
else:
topright=float('inf')
A[i][j] += min(topleft, topright, A[i-1][j])
return min(A[-1])
Reference
https://leetcode.com/problems/minimum-falling-path-sum/discuss/221123/Very-Easy-to-Understand-Python-6-line-DP-with-no-extra-space-beats-90
本文介绍了一个LeetCode上的问题——最小下降路径和。该问题要求在给定的方形矩阵中找到一条从第一行开始,每一步可以向下移动到下一列的元素路径,使得路径上所有元素的和最小。文章详细解释了动态规划的解决方案,并提供了一段Python代码实现。
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