#include<iostream>
#include<cmath>
using namespace std;
int main(){
int n,a,b;
double max=0;
cin>>n;
for(int i=0;i<n;i++){
cin>>a>>b;
double r=sqrt(a*a+b*b);
if(r>max)max=r;
}
printf("%.2f",max);
return 0;
}
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#include<iostream>
#include<cmath>
using namespace std;
int main(){
int n,a,b;
double max=0;
cin>>n;
for(int i=0;i<n;i++){
cin>>a>>b;
double r=sqrt(a*a+b*b);
if(r>max)max=r;
}
printf("%.2f",max);
return 0;
}
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