Language: C++

#include<bits/stdc++.h>
using namespace std;
 
int main(){
  int n, m, b[100], a[100][100], c[100] = {};
  cin >> n >> m;
  for(int i = 0; i < n; i++){
    for(int j = 0; j < m; j++){
      cin >> a[i][j];
    }
  }
  for(int i = 0; i < m; i++){
    cin >> b[i];
  }
  for(int i = 0; i < n; i++){
    for(int j = 0; j < m; j++){
      c[i] += a[i][j] * b[j];
    }
  }
  for(int i = 0; i < n; i++){
    cout << c[i] << endl;
  }
}


Compiler output:
a.cc:3:1: error: extended character   is not valid in an identifier
    3 |  
      | ^
a.cc:5:1: error: extended character   is not valid in an identifier
    5 |   int n, m, b[100], a[100][100], c[100] = {};
      | ^
a.cc:5:1: error: extended character   is not valid in an identifier
a.cc:6:1: error: extended character   is not valid in an identifier
    6 |   cin >> n >> m;
      | ^
a.cc:6:1: error: extended character   is not valid in an identifier
a.cc:7:1: error: extended character   is not valid in an identifier
    7 |   for(int i = 0; i < n; i++){
      | ^
a.cc:7:1: error: extended character   is not valid in an identifier
a.cc:8:1: error: extended character   is not valid in an identifier
    8 |     for(int j = 0; j < m; j++){
      | ^
a.cc:8:1: error: extended character   is not valid in an identifier
a.cc:8:1: error: extended character   is not valid in an identifier
a.cc:8:1: error: extended character   is not valid in an identifier
a.cc:9:1: error: extended character   is not valid in an identifier
    9 |       cin >> a[i][j];
      | ^
a.cc:9:1: error: extended character   is not valid in an identifier
a.cc:9:1: error: extended character   is not valid in an identifier
a.cc:9:1: error: extended character   is not valid in an identifier
a.cc:9:1: error: extended character   is not valid in an identifier
a.cc:9:1: error: extended character   is not valid in an identifier
a.cc:10:1: error: extended character   is not valid in an identifier
   10 |     }
      | ^
a.cc:10:1: error: extended character   is not valid in an identifier
a.cc:10:1: error: extended character   is not valid in an identifier
a.cc:10:1: error: extended character   is not valid in an identifier
a.cc:11:1: error: extended character   is not valid in an identifier
   11 |   }
      | ^
a.cc:11:1: error: extended character   is not valid in an identifier
a.cc:12:1: error: extended character   is not valid in an identifier
   12 |   for(int i = 0; i < m; i++){
      | ^
a.cc:12:1: error: extended character   is not valid in an identifier
a.cc:13:1: error: extended character   is not valid in an identifier
   13 |     cin >> b[i];
      | ^
a.cc:13:1: error: extended character   is not valid in an identifier
a.cc:13:1: error: extended character   is not valid in an identifier
a.cc:13:1: error: extended character   is not valid in an identifier
a.cc:14:1: error: extended character   is not valid in an identifier
   14 |   }
      | ^
a.cc:14:1: error: extended character   is not valid in an identifier
a.cc:15:1: error: extended character   is not valid in an identifier
   15 |   for(int i = 0; i < n; i++){
      | ^
a.cc:15:1: error: extended character   is not valid in an identifier
a.cc:16:1: error: extended character   is not valid in an identifier
   16 |     for(int j = 0; j < m; j++){
      | ^
a.cc:16:1: error: extended character   is not valid in an identifier
a.cc:16:1: error: extended character   is not valid in an identifier
a.cc:16:1: error: extended character   is not valid in an identifier
a.cc:17:1: error: extended character   is not valid in an identifier
   17 |       c[i] += a[i][j] * b[j];
      | ^
a.cc:17:1: error: extended character   is not valid in an identifier
a.cc:17:1: error: extended character   is not valid in an identifier
a.cc:17:1: error: extended character   is not valid in an identifier
a.cc:17:1: error: extended character   is not valid in an identifier
a.cc:17:1: error: extended character   is not valid in an identifier
a.cc:18:1: error: extended character   is not valid in an identifier
   18 |     }
      | ^
a.cc:18:1: error: extended character   is not valid in an identifier
a.cc:18:1: error: extended character   is not valid in an identifier
a.cc:18:1: error: extended character   is not valid in an identifier
a.cc:19:1: error: extended character   is not valid in an identifier
   19 |   }
      | ^
a.cc:19:1: error: extended character   is not valid in an identifier
a.cc:20:1: error: extended character   is not valid in an identifier
   20 |   for(int i = 0; i < n; i++){
      | ^
a.cc:20:1: error: extended character   is not valid in an identifier
a.cc:21:1: error: extended character   is not valid in an identifier
   21 |     cout << c[i] << endl;
      | ^
a.cc:21:1: error: extended character   is not valid in an identifier
a.cc:21:1: error: extended character   is not valid in an identifier
a.cc:21:1: error: extended character   is not valid in an identifier
a.cc:22:1: error: extended character   is not valid in an identifier
   22 |   }
      | ^
a.cc:22:1: error: extended character   is not valid in an identifier
a.cc:3:1: error: '\U000000a0' does not name a type
    3 |  
      | ^