Compilare: user.cpp: In function ‘void dfs()’: user.cpp:149:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(stk[stkLen].cr < g[stk[stkLen].a].size()) ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~ user.cpp: In function ‘void radixSort(int)’: user.cpp:287:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] idx[(*it).xx] = 1; ^ user.cpp:291:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] idx[(*it).xx] = idx[(*ant).xx] + (*ant).yy; ^ user.cpp:291:42: warning: array subscript has type ‘char’ [-Wchar-subscripts] idx[(*it).xx] = idx[(*ant).xx] + (*ant).yy; ^ user.cpp: In function ‘void getSir()’: user.cpp:315:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < lev[i].size(); j ++) ~~^~~~~~~~~~~~~~~ user.cpp: In function ‘void getMaxLec(std::__cxx11::string&)’: user.cpp:335:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i <= s.size(); i ++) ~~^~~~~~~~~~~ user.cpp:339:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1; j < s.size(); j ++) ~~^~~~~~~~~~ user.cpp:364:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = k; i < s.size(); i ++) ~~^~~~~~~~~~ user.cpp: In function ‘void getCand()’: user.cpp:385:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < lev[i].size(); j ++) ~~^~~~~~~~~~~~~~~