Compilare: user.cpp: In function ‘int hash_find(const int&)’: user.cpp:17:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < H[a].size(); i ++) ^ user.cpp: In function ‘bool cuplaj(const int&)’: user.cpp:31:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < L[node].size(); i ++) ^ user.cpp:41:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < L[node].size(); i ++) ^ user.cpp: In function ‘int main()’: user.cpp:63:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(hash_find(b) == H[a].size()) ^ user.cpp: In function ‘bool cuplaj(const int&)’: user.cpp:50:1: warning: control reaches end of non-void function [-Wreturn-type] } ^