/in/foo.cc: In function 'void work(std::string)':
/in/foo.cc:316:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  316 |         for(int i=0;i<st.size();i++)
      |                     ~^~~~~~~~~~
/in/foo.cc: In function 'int hhash(std::string)':
/in/foo.cc:359:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  359 |         for(int i=0;i<st.size();i++)
      |                     ~^~~~~~~~~~
/in/foo.cc:360:36: warning: array subscript has type 'char' [-Wchar-subscripts]
  360 |                 ret=ret*10+mp[st[i]];
      |                                    ^
/in/foo.cc: In function 'void dfs(std::string, int, std::stack<std::__cxx11::basic_string<char> >, std::string)':
/in/foo.cc:397:42: warning: comparison of integer expressions of different signedness: 'std::stack<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} and 'std::map<std::__cxx11::basic_string<char>, int>::mapped_type' {aka 'int'} [-Wsign-compare]
  397 |                 if(vis[stt]&&sol.size()+1>=turnnum[stt]) continue;
/in/foo.cc: In function 'void change(std::string&, std::string, int, int)':
/in/foo.cc:409:43: warning: array subscript has type 'char' [-Wchar-subscripts]
  409 |         if(ret=="U12") scross[cube.BB[1][2]]=ret;
      |                               ~~~~~~~~~~~~^
/in/foo.cc:410:43: warning: array subscript has type 'char' [-Wchar-subscripts]
  410 |         if(ret=="U21") scross[cube.LL[1][2]]=ret;
      |                               ~~~~~~~~~~~~^
/in/foo.cc:411:43: warning: array subscript has type 'char' [-Wchar-subscripts]
  411 |         if(ret=="U32") scross[cube.FF[1][2]]=ret;
      |                               ~~~~~~~~~~~~^
/in/foo.cc:412:43: warning: array subscript has type 'char' [-Wchar-subscripts]
  412 |         if(ret=="U23") scross[cube.RR[1][2]]=ret;
      |                               ~~~~~~~~~~~~^
/in/foo.cc:413:43: warning: array subscript has type 'char' [-Wchar-subscripts]
  413 |         if(ret=="D12") scross[cube.FF[3][2]]=ret;
      |                               ~~~~~~~~~~~~^
/in/foo.cc:414:43: warning: array subscript has type 'char' [-Wchar-subscripts]
  414 |         if(ret=="D21") scross[cube.LL[3][2]]=ret;
      |                               ~~~~~~~~~~~~^
/in/foo.cc:415:43: warning: array subscript has type 'char' [-Wchar-subscripts]
  415 |         if(ret=="D32") scross[cube.BB[3][2]]=ret;
      |                               ~~~~~~~~~~~~^
/in/foo.cc:416:43: warning: array subscript has type 'char' [-Wchar-subscripts]
  416 |         if(ret=="D23") scross[cube.RR[3][2]]=ret;
      |                               ~~~~~~~~~~~~^
/in/foo.cc:417:43: warning: array subscript has type 'char' [-Wchar-subscripts]
  417 |         if(ret=="F12") scross[cube.UU[3][2]]=ret;
      |                               ~~~~~~~~~~~~^
/in/foo.cc:418:43: warning: array subscript has type 'char' [-Wchar-subscripts]
  418 |         if(ret=="F21") scross[cube.LL[2][3]]=ret;
      |                               ~~~~~~~~~~~~^
/in/foo.cc:419:43: warning: array subscript has type 'char' [-Wchar-subscripts]
  419 |         if(ret=="F32") scross[cube.DD[1][2]]=ret;
      |                               ~~~~~~~~~~~~^
/in/foo.cc:420:43: warning: array subscript has type 'char' [-Wchar-subscripts]
  420 |         if(ret=="F23") scross[cube.RR[2][1]]=ret;
      |                               ~~~~~~~~~~~~^
/in/foo.cc:421:43: warning: array subscript has type 'char' [-Wchar-subscripts]
  421 |         if(ret=="B12") scross[cube.UU[1][2]]=ret;
      |                               ~~~~~~~~~~~~^
/in/foo.cc:422:43: warning: array subscript has type 'char' [-Wchar-subscripts]
  422 |         if(ret=="B21") scross[cube.RR[2][3]]=ret;
      |                               ~~~~~~~~~~~~^
/in/foo.cc:423:43: warning: array subscript has type 'char' [-Wchar-subscripts]
  423 |         if(ret=="B32") scross[cube.DD[3][2]]=ret;
      |                               ~~~~~~~~~~~~^
/in/foo.cc:424:43: warning: array subscript has type 'char' [-Wchar-subscripts]
  424 |         if(ret=="B23") scross[cube.LL[2][1]]=ret;
      |                               ~~~~~~~~~~~~^
/in/foo.cc:425:43: warning: array subscript has type 'char' [-Wchar-subscripts]
  425 |         if(ret=="L12") scross[cube.UU[2][1]]=ret;
      |                               ~~~~~~~~~~~~^
/in/foo.cc:426:43: warning: array subscript has type 'char' [-Wchar-subscripts]
  426 |         if(ret=="L21") scross[cube.BB[2][3]]=ret;
      |                               ~~~~~~~~~~~~^
/in/foo.cc:427:43: warning: array subscript has type 'char' [-Wchar-subscripts]
  427 |         if(ret=="L32") scross[cube.DD[2][1]]=ret;
      |                               ~~~~~~~~~~~~^
/in/foo.cc:428:43: warning: array subscript has type 'char' [-Wchar-subscripts]
  428 |         if(ret=="L23") scross[cube.FF[2][1]]=ret;
      |                               ~~~~~~~~~~~~^
/in/foo.cc:429:43: warning: array subscript has type 'char' [-Wchar-subscripts]
  429 |         if(ret=="R12") scross[cube.UU[2][3]]=ret;
      |                               ~~~~~~~~~~~~^
/in/foo.cc:430:43: warning: array subscript has type 'char' [-Wchar-subscripts]
  430 |         if(ret=="R21") scross[cube.FF[2][3]]=ret;
      |                               ~~~~~~~~~~~~^
/in/foo.cc:431:43: warning: array subscript has type 'char' [-Wchar-subscripts]
  431 |         if(ret=="R32") scross[cube.DD[2][3]]=ret;
      |                               ~~~~~~~~~~~~^
/in/foo.cc:432:43: warning: array subscript has type 'char' [-Wchar-subscripts]
  432 |         if(ret=="R23") scross[cube.BB[2][1]]=ret;
      |                               ~~~~~~~~~~~~^
/in/foo.cc: In function 'std::string near(std::string, int, int)':
/in/foo.cc:498:1: warning: control reaches end of non-void function [-Wreturn-type]
  498 | }
      | ^