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题解 | 计算协方差矩阵

import numpy as np def calculate_covariance_matrix(vectors): n_features, n_obser = len(vectors), len(vectors[0]) covar_matrix = [[0]*n_featur...

2025-09-06

0 15

题解 | 链表相加(二)

# class ListNode: # def __init__(self, x): # self.val = x # self.next = None # # 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可 # # # @para...

2025-08-23

0 15

题解 | 自然数数组的排序

def my_sort(n:int, arr:list)->None: for i in range(n): if i == arr[i]-1: continue while i != arr[i]-1: arr[arr[i]-...

2025-04-09

0 58

题解 | 机器人达到指定位置方法数

MOD = 10 ** 9 + 7# 读取输入N, M, K, P = map(int, input().split())dp = [0]*(N+1)dp[M] = 1for _ in range(K): leftup = dp[1] for i in range(1, N+1): ...

2025-04-07

0 46