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的方法
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#include<bits/stdc++.h>
using namespace std;
int main(){
freopen("p1677.in","r",stdin);
freopen("p1677.out","w",stdout);
int n;
cin>>n;
cout<<n<<"=";
int t=n;
for(int i=2;i*i<=t;i++){
while(t%i==0){
cout<<i;
t/=i;
if(t!=1){
cout<<"*";
}
}
}
if(t>1){
cout<<t;
}
return 0;
}
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