Compilare: user.cpp: In function ‘int main()’: user.cpp:30:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(last4.size()>k) ^ user.cpp:49:62: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < hossz.size()-(last4.size()-1-i); j++) ^ user.cpp:37:23: warning: unused variable ‘kislocsi’ [-Wunused-variable] long long int kislocsi = 1; ^ user.cpp:21:9: warning: unused variable ‘index’ [-Wunused-variable] int index = 0; ^