Compilare: main.cpp: In function 'int main()': main.cpp:27:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < cnt.size(); i++) { ~~^~~~~~~~~~~~ main.cpp:35:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < cnt.size(); i++) { ~~^~~~~~~~~~~~ main.cpp:43:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < cnt.size(); i++) { ~~^~~~~~~~~~~~ main.cpp:51:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(; len < cnt.size() && (self->mp[cnt[len]])->exists; len++) { ~~~~^~~~~~~~~~~~ main.cpp:51:57: warning: array subscript has type 'char' [-Wchar-subscripts] for(; len < cnt.size() && (self->mp[cnt[len]])->exists; len++) { ^