题意:n的阶乘后面0的个数,如果直接算出阶乘再数0的数量一定会超时的. 因为10=2*5,所以求出5贡献的次数就行. #include "bits/stdc++.h" using namespace std; #define LL long long #define INF 0x3f3f3f3f3f #define PI acos(-1) #define N 510 LL arr[N]; int main() { int n,k; while(~scanf("%d"…
题目链接: http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemCode=2818 题目描述: Given positive integers B and N, find an integer A such that AN is as close as possible to B. (The result A is an approximation to the Nth root of B.) Note that AN may be l…
Problem Description Professor Zhang has a number sequence a1,a2,...,an. However, the sequence is not complete and some elements are missing. Fortunately, Professor Zhang remembers some properties of the sequence: 1. For every i∈{1,2,...,n}, 0≤ai≤100.…
过程很美妙啊 Problem Description Rikka is a high school girl suffering seriously from Chūnibyō (the age of fourteen would either act like a know-it-all adult, or thinks they have special powers no one else has. You might google it for detailed explanation)…
Given an integer n, return the number of trailing zeroes in n!. Note: Your solution should be in logarithmic time complexity. 题目标签:Math 题目要求我们找到末尾0的数量. 只有当有10的存在,才会有0,比如 2 * 5 = 10; 4 * 5 = 20; 5 * 6 = 30; 5 * 8 = 40 等等,可以发现0 和 5 的联系. 所以这一题也是在问 n 里有多…