#include <bits/stdc++.h> using namespace std; int main(){ int xx1,yy1,xx2,yy2; cin>>xx1>>yy1>>xx2>>yy2; double E=sqrt((xx1-xx2)*(xx1-xx2)+(yy1-yy2)*(yy1-yy2)); double M=fabs(xx1-xx2)+fabs(yy1-yy2); double distance=fabs(M-E); cout<<fixed<<setprecision(18)<...