foo.cc:3:6: error: expected identifier before numeric constant
 int [5005],n,m;
      ^~~~
foo.cc:3:6: error: expected ']' before numeric constant
 int [5005],n,m;
      ^~~~
      ]
foo.cc:3:5: warning: structured bindings only available with -std=c++17 or -std=gnu++17
 int [5005],n,m;
     ^
foo.cc:3:5: error: structured binding declaration cannot have type 'int'
foo.cc:3:5: note: type must be cv-qualified 'auto' or reference to cv-qualified 'auto'
foo.cc:3:5: error: empty structured binding declaration
foo.cc:3:11: error: expected initializer before ',' token
 int [5005],n,m;
           ^
foo.cc: In function 'int main()':
foo.cc:6:12: error: 'n' was not declared in this scope
     cin >> n >> m;
            ^
foo.cc:6:12: note: suggested alternative: 'yn'
     cin >> n >> m;
            ^
            yn
foo.cc:6:17: error: 'm' was not declared in this scope
     cin >> n >> m;
                 ^
foo.cc:6:17: note: suggested alternative: 'tm'
     cin >> n >> m;
                 ^
                 tm
foo.cc:11:16: error: 'a' was not declared in this scope
             if(a[j]==0)
                ^
foo.cc:23:12: error: 'a' was not declared in this scope
         if(a[i]==0)
            ^