foo.cc: In function 'int main()':
foo.cc:14:33: warning: unused variable 'a' [-Wunused-variable]
   14 |                         int p=j,a;
      |                                 ^
foo.cc:17:17: error: 'a' was not declared in this scope
   17 |                 a=h[p];
      |                 ^
foo.cc:17:21: error: 'p' was not declared in this scope
   17 |                 a=h[p];
      |                     ^
foo.cc:28:48: error: expected ';' before ')' token
   28 |                                 for(int k=j;k<m)
      |                                                ^
      |                                                ;

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