/in/foo.cc: In function 'void init(int (*)[23])':
/in/foo.cc:36:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    while (tmp < a.size() && a[tmp] == a[tmp - 1]) ++tmp;
           ~~~~^~~~~~~~~~
/in/foo.cc:37:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    while (tmp < a.size()) {
           ~~~~^~~~~~~~~~
/in/foo.cc:43:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while (tmp < a.size() && a[tmp] == a[tmp - 1])
            ~~~~^~~~~~~~~~
/in/foo.cc:47:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    if (tmp == a.size()) SG[i][j] = num;
        ~~~~^~~~~~~~~~~