/in/foo.cc: In function 'void init(int (*)[23])':
/in/foo.cc:48:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   48 |             while (tmp < a.size() && a[tmp] == a[tmp - 1]) ++tmp;
      |                    ~~~~^~~~~~~~~~
/in/foo.cc:49:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   49 |             while (tmp < a.size()) {
      |                    ~~~~^~~~~~~~~~
/in/foo.cc:55:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |                 while (tmp < a.size() && a[tmp] == a[tmp - 1])
      |                        ~~~~^~~~~~~~~~
/in/foo.cc:59:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   59 |             if (tmp == a.size()) SG[i][j] = num;
      |                 ~~~~^~~~~~~~~~~