foo.cc: In function 'int getNum(int*, int, int)':
foo.cc:14:5: warning: no return statement in function returning non-void [-Wreturn-type]
     }
     ^
foo.cc: In function 'bool find(int)':
foo.cc:87:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
      if(j==s.size()-1&&s[i]=='0') return false;
         ~^~~~~~~~~~~~
foo.cc:90:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
        if(j>=s.size()-1) return true;
           ~^~~~~~~~~~~~
foo.cc:91:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
        if(n>=s.size()-1) {n=s.size()-1;if(!tailCheck(i,j,m,n)) return false;}
           ~^~~~~~~~~~~~
foo.cc: In function 'bool Equal000(std::__cxx11::string)':
foo.cc:168:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
      for(int i=0;i<s1.size();++i)
                  ~^~~~~~~~~~
foo.cc: In function 'int main()':
foo.cc:196:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int l=1;l<=s1.size();++l)
                 ~^~~~~~~~~~~

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