vector究极无敌简洁版
#include<iostream>
#include<vector>
using namespace std;
vector<int> v;
int main(){
int n;
cin>>n;
int st=0;
for(int i=1;i<=n;++i){
v.push_back(i);
}
while(v.size()!=1){
st=(st+2)%v.size();
v.erase(v.begin()+st);
}
cout<<v[0];
return 0;
}
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