更新于 2/16/2021, 7:21:14 AM python3 DP自下而上的方法,只用一维数组记录,所以是O(n)的额外空间 class Solution: def minimumTotal(self, triangle): # write your code here if not triangle or not triangle[0]: return 0 n, m = len(triangle)
append(triangle[0]) for i in range(1, m): row = triangle[i] n = len(row) sub_dp = [0] * n sub_dp[0] = dp[i - 1][0] + row[0] for j in range(1, n - 1): sub_dp[j] = min(dp[i - 1][j - 1], dp[i - 1][j]) + row[j] sub_dp[-1] = dp[i - 1...
Bonus point if you are able to do this using onlyO(n) extra space, wherenis the total number of rows in the triangle. 代码:oj测试通过 Runtime: 82 ms 1classSolution:2#@param triangle, a list of lists of integers3#@return an integer4defminimumTotal(self, triangle):5#special case6ifl...
return [] for i in range(rowIndex): this = [] for j in range(i+1): this.append(1) if i > 1: for x in range(i - 1): this[x+1] = ans[i-1][x] + ans[i-1][x+1] print this ans.append(this) return ans[rowIndex - 1] 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. ...
space, where n is the total number of rows in the triangle. 原题路径: https://oj.leetcode.com/problems/triangle/ 结题思路: 题目中的三角形不适合找到解题思路,把他看成一个矩阵的左下角。 该题就成了一个方格路径的问题。 自上而下,上方的每个元素只能和其正下方和右下方的元素相加。用一个列表记...
来自专栏 · LeetCode 每日一题 题意 给定一个数组 triangle ,求从顶部到底部的路径中数字和的最小值。 如果当前在第 i 列,那么可以选择到达下一行的第 i 列或第 i + 1 列。 进阶:使用空间复杂度为 O(n) 的算法求解。 数据限制 1 <= triangle.length <= 200 triangle[0].length == 1 triangle[i...
python 解法,DP,与解法一相同。 为了加强对Python的练习,以后的练习中都会Python的程序。 class Solution: def minimumTotal(self, triangle): """ :type triangle: List[List[int]] :rtype: int """ if not triangle: return res = triangle[-1] for i in range(len(triangle)-2, -1, -1): for ...
Python turtle triangle Spiral code In this section, we will learn abouthow to draw triangle spiral codein Python turtle. A Spiral is defined as a long curved line that moves round and round from a central point. Similarly triangle spiral is a long curved line that moves around and round aw...
Python Code: # Display a message prompting the user to input lengths of the sides of a triangleprint("Input lengths of the triangle sides: ")# Request input from the user for the length of side 'x' and convert it to an integerx=int(input("x: "))# Request input from the user for...
leetcode 118. Pascal's Triangle (Python) 题目: Given a non-negative integer numRows, generate the first numRows of Pascal's triangle. In Pascal's triangle, each number is the sum of the two numbers directly above it. Example: &n......