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全部文章（共17篇）

题解 | 校门外的树

L, M = map(int, input().split()) t = [1] * (L + 1) for _ in range(M): l, r = map(int, input().split()) for j in range(l, r + 1): t[j] ...

2025-11-04

1 8

题解 | 记数问题

n, x = map(int, input().split()) c = 0 for i in range(n): c += str(i + 1).count(str(x)) print(c)

2025-11-04

2 6

题解 | 数组计数维护

T=int(input()) for _ in range(T): n,k=map(int,input().split()) a=list(map(int,input().split())) s=cnt=0 for i in range(n): if ...

2025-11-04

1 8

题解 | 牛牛的数学作业

T=int(input()) for i in range(T): n=int(input()) a=list(map(int,input().split())) x=max(a)-min(a) avg=sum(a)/n s=0 for j in ra...

2025-11-04

1 8

题解 | 左侧严格小于计数

n=int(input()) a=list(map(int,input().split())) l=[] for i in range(n): c=0 for j in range(i): if a[j]<a[i]:c+=1 l.append(c) pr...

2025-11-04

1 6

题解 | 二维斐波那契数列

n, m = map(int, input().split()) mod = 10 ** 9 + 7 p = 1 <= n, m <= 10 ** 3 a = [[0] * (m + 1) for _ in range(n + 1)] a[1][1] = 1 if p: for ...

2025-11-03

1 8

题解 | 牛牛学数列6

n=int(input()) p=1<=n<=20 a=[0]*(n+1) a[1],a[2],a[3]=0,1,1 if p: for i in range(4,n+1):a[i]=a[i-3]+2*a[i-2]+a[i-1] print(a[n])

2025-11-03

1 8

题解 | 牛牛数数

n=int(input()) p=1<=n<=10**5 if p: for i in range(1,n+1): p1=i%4!=0 p2='4' not in str(i) if p1*p2:print(i) else:prin...

2025-10-30

1 10

题解 | 数位之和

n=abs(int(input())) p=n<=10**9 print(sum(int(i) for i in f'{n}' if p else'超出范围')) # 此题提交后报错，提示的输入数值已超10的9次方的范围，答案未将描述中n的范围考虑进去

2025-10-30

1 9

题解 | 牛牛学数列5

n=int(input()) p=1<=n<=46 a,b=1,1 if p: for i in range(n-2):a,b=b,a+b print(1 if n<3 else b) else:print('请满足1≦n≦46的正整数要求')

2025-10-30

1 11