Triangle Leetcode Python
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Given a triangle, find the minimum path sum from top to bottom. Each step you may move to adjacent numbers on the row below.
For example, given the following triangle
[
[2],
[3,4],
[6,5,7],
[4,1,8,3]
For example, given the following triangle
[
[2],
[3,4],
[6,5,7],
[4,1,8,3]
]
The minimum path sum from top to bottom is 11 (i.e., 2 + 3 + 5 + 1 = 11).
这道题目采用动态规划，从最底下往上依次相加得到解。
this is a DP problem, we can solve this problem by suming up from the bottom to the top.
class Solution: # @param triangle, a list of lists of integers # @return an integer def minimumTotal(self, triangle): rownum=len(triangle) for index in reversed(range(rownum)): if index==rownum-1: m=triangle[index] else: for j in range(index+1): m[j]=triangle[index][j]+min(m[j],m[j+1]) return m[0]
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