foo.cc: In function ‘int main()’:
foo.cc:11:18: error: expected ‘;’ before ‘for’
   11 |         cin>>a[i]
      |                  ^
      |                  ;
   12 |     for(int i=1;i<=m;i++){
      |     ~~~           
foo.cc:12:17: error: ‘i’ was not declared in this scope
   12 |     for(int i=1;i<=m;i++){
      |                 ^