foo.cc: In function ‘int main()’:
foo.cc:26:22: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::__cxx11::basic_string<char>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   26 |         for(int i=1;i<outstr.size();i++)
      |                     ~^~~~~~~~~~~~~~
foo.cc:27:52: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   27 |                 if(outstr[i-1]=='2'&&outstr[i]!='('&&outstr[i]!=')'

正在同步测试数据，请稍后