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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main ()
  5. {
  6.     int n; cin >> n;
  7.     double a[101][101+1], x[100], ratio;
  8.     for (int i=1; i<=n; i++){
  9.         for (int j=1; j<=n+1; j++){
  10.             cin >> a[i][j]; 
  11.         }
  12.     }
  13.  
  14.     for (int i=1; i<n; i++){
  15.         if (a[i][i]==0){
  16.             cout << "Error!" << endl;
  17.             break;
  18.         }
  19.         for (int j=i+1; j<=n; j++){
  20.             ratio = a[j][i]/a[i][i];
  21.             for (int k=1; k<=n+1; k++){
  22.                 a[j][k] = a[j][k] - a[i][k]*ratio;
  23.             }
  24.         }
  25.     }
  26.  
  27.     for (int i=1; i<=n; i++){
  28.         for (int j=1; j<=n+1; j++){
  29.             cout << a[i][j] << " ";
  30.         }
  31.         cout << endl;
  32.     }
  33.  
  34.     for (int i = n; i >= 2; i--) {
  35.         for (int j = i - 1; j >= 1; j--) {
  36.             double ratio = a[j][i] / a[i][i];
  37.             for (int k = 1; k <= n + 1; k++) {
  38.                 a[j][k] = a[j][k] - ratio * a[i][k];
  39.             }
  40.         }
  41.     }
  42.  
  43.     for (int i=1; i<=n; i++){
  44.         for (int j=1; j<=n+1; j++){
  45.             cout << a[i][j] << " ";
  46.         }
  47.         cout << endl;
  48.     }
  49.  
  50.     for (int i=1; i<=n; i++){
  51.         x[i]= a[i][n+1]/a[i][i];
  52.     }
  53.     for (int i=1; i<=n; i++){
  54.         cout << x[i] <<endl;
  55. }
  56.  
  57.  
  58. }
Success #stdin #stdout 0.01s 5316KB
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stdin
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2 3 5 8
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stdout
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https://ideone.com/UDvofL
language:
C++14 (gcc 8.3)
created:
5 days ago
visibility:
public

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