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题解 | 计算协方差矩阵

import numpy as np def calculate_covariance_matrix(vectors): # 补全代码 mat=np.array(vectors) mean=mat.mean(axis=1,keepdims=True) centere...

2026-01-14

0 12

题解 | 标量的矩阵乘法

from typing import List, Union import numpy as np def scalar_multiply(matrix: List[List[Union[int, float]]], scalar: Union[int, float]) -> List[Lis...

2026-01-14

0 8

题解 | 按行或列计算平均值

from typing import List, Union import numpy as np def calculate_matrix_mean(matrix: List[List[Union[int, float]]], mode: str) -> List[float]: ...

2026-01-14

0 9

题解 | 重塑矩阵

from typing import List, Tuple, Union import numpy as np def reshape_matrix(a: List[List[Union[int, float]]], new_shape: Tuple[int, int]) -> List[...

2026-01-14

0 11

题解 | 矩阵转置

from typing import List, Union import numpy as np # 使用 Union 来表示类型可以是 int 或 float def transpose_matrix(a: List[List[Union[int, float]]]) -> List[L...

2026-01-14

0 12

题解 | 矩阵和向量的点积

import numpy as np def matrix_vector_dot_product(matrix, vector): # 补全代码 mat=np.array(matrix) vec=np.array(vector) if mat.shape[1]!= v...

2026-01-14

0 13

题解 | 最大子段和

import sys def accsum(n,a): max_acc=acc=a[0] for i in range(1,n): acc=max(a[i]+acc,a[i]) max_acc=max(max_acc,acc) return m...

2026-01-14

0 10

题解 | 最长不下降子序列

import sys import bisect def long_sub(n,lis): tails = [] for num in lis: idx = bisect.bisect_right(tails, num) if idx == le...

2026-01-14

0 10

题解 | 小红的地砖

import sys def min_energy(n,a): prev2=a[0] prev1=prev2+a[1] for i in range(2,n): current=min(prev2,prev1)+a[i] prev2=prev1...

2026-01-14

0 8

题解 | 数楼梯

import sys def main(): n=int(sys.stdin.readline()) a=1 b=2 if n==1: print(a) return elif n==2: print(b) ...

2026-01-14

0 8