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贴代码,28行。#include<iostream> using namespace std; int main() { int n,ans,i; while(cin>>n&&n) { if(n==1) { cout<<0<<endl; continue; } ans=n; for(i=2;i*i<=n;++i) if(n%i==0) { ans-=ans/i; while(n%i==0) n/=i; } if(n!=1) ans-=ans/n; cout<<ans<<endl; } return 0; } Followed by:
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