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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define debug(x) cerr << #x << " = " << x << endl;
  4. #define int long long
  5. tuple<int,double,double> ghpt(double a, double b, double c, double a1, double b1, double c1){
  6.     // value.first = 0 or 1 or 2 lan luot tuong ung vo nghiem, 1 nghiem, vo so nghiem
  7.     double x, y;
  8.     if(a == 0){
  9.         y = c / b;
  10.         if(a1 == 0){
  11.             if(abs(y - c1 / b1) < 1e-6) return make_tuple(2, 0, 0);
  12.             return make_tuple(0, 0, 0);
  13.         }
  14.         x = (c1 - b1 * y) / a1;
  15.         return make_tuple(1, x, y);
  16.     }
  17.     if(a1 == 0){
  18.         y = c1 / b1;
  19.         x = (c - b * y) / a;
  20.         return make_tuple(1, x, y);
  21.     }
  22.     double u = a1 * b - a * b1;
  23.     double v = a1 * c - a * c1;
  24.     if(u == 0){
  25.         if(v == 0) return make_tuple(2, 0, 0);
  26.         return make_tuple(0, 0, 0);
  27.     }
  28.     y = v / u;
  29.     x = (c - b * y) / a;
  30.     return make_tuple(1, x, y);
  31. }
  32. signed main(){
  33.     FILE *pFile = fopen("input.txt", "r");
  34.     if(pFile != nullptr) freopen("input.txt", "r", stdin);
  35.     ios_base::sync_with_stdio(false);cin.tie(nullptr);
  36.     double a, b, c, a1, b1, c1;
  37.     cin >> a >> b >> c >> a1 >> b1 >> c1;
  38.     int u;
  39.     double x, y;
  40.     tie(u, x, y) = ghpt(a, b, c, a1, b1, c1);
  41.     if(u == 0) cout << "VONGHIEM";
  42.     else if(u == 2) cout << "VOSONGHIEM";
  43.     else{
  44.         cout << fixed << setprecision(2);
  45.         cout << x << " " << y;
  46.     }
  47. }
Success #stdin #stdout 0.01s 5584KB
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VOSONGHIEM
https://ideone.com/H7x3Zn
language:
C++14 (gcc 8.3)
created:
2 years ago
visibility:
public

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