Compilare: user.cpp: In function ‘void compEdges()’: user.cpp:40:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < In.size(); ++ i) ^ user.cpp:44:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i != In.size() - 1) ^ user.cpp: In function ‘int main()’: user.cpp:54:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:58:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^