/in/foo.cc: In function 'void init(int (*)[23])':
/in/foo.cc:36:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             while (tmp < a.size() && a[tmp] == a[tmp - 1]) ++tmp;
                    ~~~~^~~~~~~~~~
/in/foo.cc:37:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             while (tmp < a.size()) {
                    ~~~~^~~~~~~~~~
/in/foo.cc:43:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
                 while (tmp < a.size() && a[tmp] == a[tmp - 1])
                        ~~~~^~~~~~~~~~
/in/foo.cc:47:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             if (tmp == a.size()) SG[i][j] = num;
                 ~~~~^~~~~~~~~~~