foo.cc: In function ‘int main()’:
foo.cc:25:39: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::vector<int>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   25 |                         for (int p=0;p<a[i].size();p++) {
      |                                      ~^~~~~~~~~~~~
foo.cc:26:47: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::vector<int>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   26 |                                 for (int q=0;q<a[j].size();q++) {
      |                                              ~^~~~~~~~~~~~
foo.cc: At global scope:
foo.cc:56:5: error: expected unqualified-id before ‘return’
   56 |     return 0;
      |     ^~~~~~
foo.cc:57:1: error: expected declaration before ‘}’ token
   57 | }
      | ^

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