Submission #5992395

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Source Code Expand

#include <iostream>
#include <string>
#include <vector>
#include <map>
#include <utility> // pair
#include <algorithm> // swap
#include <numeric> // accumulate
#include <cmath> // pow
#include <iomanip> // setprecision
using namespace std;

#define rep(i,n) for(int i=0, i##_len=(n); i<i##_len; ++i)
#define all(x) (x).begin(),(x).end()

signed main() {
  cout << fixed << setprecision(10);
  int n;
  cin >> n;
  vector<pair<int,int>> xys;
  rep(i, n) {
    int x, y;
    cin >> x >> y;
    xys.push_back(make_pair(x, y));
  }
  double m = 0;
  rep(i, n) {
    rep(j, n) {
      double dist = pow(xys[i].first - xys[j].first, 2.0) + pow(xys[i].second - xys[j].second, 2.0);
      m = max(m, dist);
    }
  }
  cout << pow(m, 0.5);
}

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