foo.cc: In member function 'int Solution::maxGrade()':
foo.cc:57:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (size_t i = 0; i <= s[0]; i++)
                        ~~^~~~~~~
foo.cc:60:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       for (size_t j = 0; j <= s[1]; j++)
                          ~~^~~~~~~
foo.cc:62:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (size_t k = 0; k < s[2]; k++)
                            ~~^~~~~~
foo.cc:64:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
           for (size_t w = 0; w < s[3]; w++)
                              ~~^~~~~~
foo.cc: In function 'int main(int, char**)':
foo.cc:75:36: warning: array subscript is above array bounds [-Warray-bounds]
     return dp[s[1]][s[2]][s[3]][s[4]];
                                 ~~~^

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