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小暴力求出,,,然后switch。。。#include<iostream>
using namespace std;
int main()
{
int n;
while(cin>>n)
{
if(n==0)
break;
int i,j,num=0,sum=0;
for(i=n+1; i<1000000000; i++)
{
int m=2*n;
sum=i;
while(m>n)
{
if((sum%m)<=n&&(sum%m)>0)
break;
if(sum%m>0)
sum=i+sum%m-1;
else
sum=i;
m--;
}
if(m==n)
{
cout<<i<<endl;
break;
}
}
}
return 0;
}
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