题解 | 绕距
绕距
https://www.nowcoder.com/practice/7a245fc6284f4139b4fb21de58e68483?tpId=383&tqId=11181581&sourceUrl=
#include<bits/stdc++.h>
using namespace std;
int main(){
float x1,x2,y1,y2,de,dm,z;
cin>>x1>>y1>>x2>>y2;
de=sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
dm=abs(x1-x2)+abs(y1-y2);
z=abs(dm-de);
printf("%.10f",z);
}
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