不废话，直接上代码
2025-04-01 22:10:05
发布于：上海
#include<iostream>
using namespace std;
int main(){
int k,ans;
cin>>k;
for(int i=1;i<=k;i*=2)
ans+=i;
cout<<ans;
}
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2025-10-25 来自 上海
1
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