HDU 6033 Add More Zero
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Add More Zero
Problem Description
There is a youngster known for amateur propositions concerning several mathematical hard problems.
Nowadays, he is preparing a thought-provoking problem on a specific type of supercomputer which has ability to support calculations of integers between0 and (2m−1) (inclusive).
As a young man born with ten fingers, he loves the powers of10 so much, which results in his eccentricity that he always ranges integers he would like to use from1 to 10k (inclusive).
For the sake of processing, all integers he would use possibly in this interesting problem ought to be as computable as this supercomputer could.
Given the positive integerm , your task is to determine maximum possible integer k that is suitable for the specific supercomputer.
Nowadays, he is preparing a thought-provoking problem on a specific type of supercomputer which has ability to support calculations of integers between
As a young man born with ten fingers, he loves the powers of
For the sake of processing, all integers he would use possibly in this interesting problem ought to be as computable as this supercomputer could.
Given the positive integer
Input
The input contains multiple test cases. Each test case in one line contains only one positive integerm , satisfying 1≤m≤105 .
Output
For each test case, output "Case #x :y " in one line (without quotes), where x indicates the case number starting from 1 and y denotes the answer of corresponding case.
Sample Input
164
Sample Output
Case #1: 0Case #2: 19
这道题大概就是2的m次方用科学计数法来表示的话,后面乘的10的幂是多少。
化简一下可以得到结果为n/(log(10)/log(2))。
AC代码:
#include<iostream>#include<algorithm>#include<cstring>#include<cmath>#include<cstdio>using namespace std;int main(){ int n; int res; int cas=0; while(cin>>n) { cas++; res= n/(log(10)/log(2)); printf("Case #%d: %d\n",cas,res); } return 0;}
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