Compilare: user.cpp: In function ‘bool cmp(int, int)’: user.cpp:17:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < putere[a].size() && i < putere[b].size(); ++i) ^ user.cpp:17:63: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < putere[a].size() && i < putere[b].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:31:9: warning: unused variable ‘n’ [-Wunused-variable] int n = 0, len; ^