HDU 6033 数论

题目

Add More Zero

题意

给一个范围为[1，10⁵]的整数 n，求满足10^m <= 2ⁿ 的最大整数 m

题解

数论，签到题，对 2ⁿ 求对数，然后下取整就行了

代码

#include <algorithm>#include <bitset>#include <cstring>#include <cstdio>#include <cmath>#include <cstdlib>#include <climits>#include <iostream>#include <list>#include <map>#include <queue>#include <set>#include <stack>#include <string>#include <vector>using namespace std;int main(){    double x = log(2)/log(10);    int m;    int t = 1;    while(cin >> m){        int ans = (int)floor(m * x);        printf("Case #%d: %d\n",t++,ans);    }    return 0;}