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  1. /*
  2. Name: Anuska Alam
  3. Id: 230241021
  4. Report: Gauss Elimination
  5. */
  6.  
  7. #include<bits/stdc++.h>
  8. using namespace std;
  9. int main (){
  10.     int n; cin >> n;
  11.     double a[101][101+1], x[100], ratio;
  12.     for (int i=1; i<=n; i++){
  13.         for (int j=1; j<=n+1; j++){
  14.             cin >> a[i][j]; 
  15.         }
  16.     }
  17.  
  18.     for (int i=1; i<n; i++){
  19.         if (a[i][i]==0){
  20.             cout << "Error!" << endl;
  21.             break;
  22.         }
  23.         for (int j=i+1; j<=n; j++){
  24.             ratio = a[j][i]/a[i][i];
  25.             for (int k=1; k<=n+1; k++){
  26.                 a[j][k] = a[j][k] - a[i][k]*ratio;
  27.             }
  28.         }
  29.     }
  30.  
  31.     x[n]= a[n][n+1]/a[n][n];
  32.     for (int i=n-1; i>=1; i--){
  33.         x[i] = a[i][n+1];
  34.         for (int j=i+1; j<=n; j++){
  35.             x[i] = x[i] - a[i][j]*x[j];
  36.         }
  37.     }
  38.  
  39.     for (int i=1; i<=n; i++){
  40.         for (int j=1; j<=n+1; j++){
  41.             cout << a[i][j] << " ";
  42.         }
  43.         cout << endl;
  44.     }
  45.  
  46.     for (int i=1; i<=n; i++){
  47.         cout << x[i] << endl;
  48.     }
  49.  
  50. }
Success #stdin #stdout 0s 5320KB
comments (?)
stdin
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3
1 1 1 5 
2 3 5 8 
4 0 5 2
stdout
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1 1 1 5 
0 1 3 -2 
0 0 13 -26 
3
4
-2
https://ideone.com/IlmRR5
language:
C++ (gcc 8.3)
created:
6 days ago
visibility:
public

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