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题解 | 最长对称子字符串

s = input() if len(s) == 1: print(s) else: max_len = 1 k = 0 for i in range(len(s)): l, r = i, i while l >= 0 ...

2025-07-16

0 5

题解 | 单调栈

class Solution: def foundMonotoneStack(self , nums: List[int]) -> List[List[int]]: ans = [] for i in range(len(nums)): ...

2025-07-15

0 12

题解 | 杨辉三角

n = int(input()) prev_row = [] for i in range(n): row = [1] * (i + 1) for j in range(1, i): row[j] = prev_row[j-1] + prev_row[j] ...

2025-07-07

0 18

题解 | 上三角矩阵判定

n = int(input()) for i in range(n): row = list(map(int, input().split())) if row.count(0) != i: for _ in range(i + 1, n): ...

2025-07-07

1 19

题解 | 校门外的树

L, M = map(int, input().split()) trees = [1] * (L + 1) for i in range(M): a, b = map(int, input().split()) for j in range(a, b + 1): ...

2025-07-07

1 18