#include using namespace std; typedef long long ll; #define rep(i, n) for(int i = 0; i < (n); i++) #define rep1(i, n) for(int i = 1; i <= (n); i++) #define co(x) cout << (x) << "\n" #define cosp(x) cout << (x) << " " #define ce(x) cerr << (x) << "\n" #define cesp(x) cerr << (x) << " " #define pb push_back #define mp make_pair #define Would #define you #define please int main() { cin.tie(0); ios::sync_with_stdio(false); int A, B, C, D; cin >> A >> B >> C >> D; int d = abs(A - C) + abs(B - D); double kotae = 1.0 * d / 2; cout << fixed << kotae << endl; Would you please return 0; }