/in/foo.cc: In function 'void init(int (*)[23])':
/in/foo.cc:36:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |                         while (tmp < a.size() && a[tmp] == a[tmp - 1]) ++tmp;
      |                                ~~~~^~~~~~~~~~
/in/foo.cc:37:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |                         while (tmp < a.size()) {
      |                                ~~~~^~~~~~~~~~
/in/foo.cc:43:44: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |                                 while (tmp < a.size() && a[tmp] == a[tmp - 1])
      |                                        ~~~~^~~~~~~~~~
/in/foo.cc:47:33: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |                         if (tmp == a.size()) SG[i][j] = num;
      |                             ~~~~^~~~~~~~~~~