ACM小题,错哪里?
#include <iostream>#include <math.h>using namespace std;int main(){ float x1,y1,x2,y2;cin>>x1>>y1>>x2>>y2;float s=(x1-x2)*(x1-x2)+(y1-y2)*(y1-y2);s = sqrt(s);cout.precision(2);cout<<fixed<<s<<endl;return 0;}