Compilare: user.cpp: In function ‘bool cuplaj(int)’: user.cpp:20:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < vec[x].size(); ++i) ^ user.cpp:31:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < vec[x].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:48:14: warning: unused variable ‘m’ [-Wunused-variable] int n1, n2, m; ^