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题解 | 小红的二分图构造

from math import inf def solved(): n = int(input()) degree = [0] + list(map(int, input().split())) k = sum(degree) if k % 2== 1: ...

2025-07-23

0 17

题解 | 小红的双生数

def solved(): s = input() if len(s) % 2 == 1: k = (len(s)+1) // 2 print("1100" * (k//2) + "11" * (k%2)) ...

2025-07-23

0 19

题解 | 小红的二叉树

n = int(input()) ans = 0 MAX_NUM = 10 ** 9 + 7 if n <= 1: print(0) else: print(int((3 * pow(2, n-1, MAX_NUM) - 5) % MAX_NUM))

2025-07-23

0 15

题解 | 24点游戏算法

import sys nums = list(map(int, input().split())) def dfs(arr): if len(arr) == 1: return abs(arr[0] - 24) < 1e-6 for i in range(le...

2025-07-21

0 12

题解 | 字符串加密

import sys s = input() t = input() s_list = [] s_set = set() for s_ in s: if s_ not in s_set: s_list.append(s_) s_set.add(s_) fo...

2025-07-18

0 14

题解 | 整数与IP地址间的转换

import sys def ip_to_num(ip): ipes = ip.split('.') ans = 0 for ip in ipes: ans <<= 8 ans += int(ip) return ans ...

2025-07-18

0 16

题解 | 密码截取

import sys s = input() n = len(s) dp = [[0 for _ in range(n)] for _ in range(n)] max_len = 1 for i in range(n-1, -1, -1): for j in range(i, n): ...

2025-07-18

0 15

题解 | 字符串加解密

import sys def decode(s): ans = [] for s_ in s: if s_.isdigit(): ans.append(str((int(s_)+9) % 10)) elif s_.isuppe...

2025-07-18

0 19

题解 | 字符串排序

import sys strings = input() class StrCompare: def __init__(self, s, idx): self.s = s self.idx = idx def __lt__(self, othe...

2025-07-18

0 24