HRBUST
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//// Created by liyuanshuo on 2017/2/26.//#include <iostream>#include <cstdlib>#include <cstdio>#include <cmath>using namespace std;int main3(){ int n; float x1, x2, y1, y2; cin>>n; while ( n-- ) { cin>>x1>>y1>>x2>>y2; float ans = sqrt( pow((x1-x2), 2)+ pow((y1 - y2), 2)); printf("%.2lf\n", ans); } return 0;}
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