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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5.     ios::sync_with_stdio(false);
  6.     cin.tie(nullptr);
  7.     long long a, b, c, d, e, f;
  8.     cin >> a >> b >> c >> d >> e >> f;
  9.     vector<long long> t1 = {a, b, c};
  10.     vector<long long> t2 = {d, e, f};
  11.     sort(t1.begin(), t1.end());
  12.     sort(t2.begin(), t2.end());
  13.     if (t1 != t2) {
  14.         cout << -1;
  15.         return 0;
  16.     }
  17.     long long x = t1[0], y = t1[1], z = t1[2];
  18.     if (x + y <= z) {
  19.         cout << -1;
  20.         return 0;
  21.     }
  22.     if (!(x == y || y == z)) {
  23.         cout << -1;
  24.         return 0;
  25.     }
  26.     double p = (x + y + z) / 2.0;
  27.     double v = sqrt(p * (p - x) * (p - y) * (p - z));
  28.     double l = 2.0 * v;
  29.     cout << fixed << setprecision(2) << l;
  30.     return 0;
  31. }
  32.  
Success #stdin #stdout 0.01s 5292KB
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stdin
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3 4 5 4 5 3
stdout
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-1
https://ideone.com/JH5DTE
language:
C++ (gcc 8.3)
created:
4 hours ago
visibility:
public

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