Compilare: user.cpp: In function ‘void radixSort(int)’: user.cpp:133:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] idx[(*it).xx] = 1; ^ user.cpp:137:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] idx[(*it).xx] = idx[(*ant).xx] + (*ant).yy; ^ user.cpp:137:42: warning: array subscript has type ‘char’ [-Wchar-subscripts] idx[(*it).xx] = idx[(*ant).xx] + (*ant).yy; ^ user.cpp: In function ‘void getSir()’: user.cpp:161:22: 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:200:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i <= s.size(); i ++) ~~^~~~~~~~~~~ user.cpp:204:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1; j < s.size(); j ++) ~~^~~~~~~~~~ user.cpp:229:22: 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:250:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < lev[i].size(); j ++) ~~^~~~~~~~~~~~~~~