Compilare: user.cpp: In function ‘void citire()’: user.cpp:22:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j<=s.size()){ ^ user.cpp: In function ‘bool cupleaza(int)’: user.cpp:44:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i <= v[start].size()-1 ; i++) ^ user.cpp:51:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i<= v[start].size()-1 ; i++) ^