Compilare: main.cpp: In function 'void Add(long long int, long long int)': main.cpp:34:7: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pos==s.size()-1){ ~~~^~~~~~~~~~~~ main.cpp: In function 'void Remove(long long int, long long int)': main.cpp:42:7: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pos==s.size()-1){ ~~~^~~~~~~~~~~~ main.cpp: In function 'long long int Cnt(long long int, long long int)': main.cpp:52:7: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pos==s.size()-1){ ~~~^~~~~~~~~~~~ main.cpp: In function 'long long int Pref(long long int, long long int)': main.cpp:65:7: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pos==s.size()-1){ ~~~^~~~~~~~~~~~