Compilare: user.cpp: In function ‘bool cupleaza(int)’: user.cpp:33:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v1[nod].size (); ++i) { ^ user.cpp:45:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v1[nod].size (); ++i) { ^ user.cpp: In function ‘void ilum(int)’: user.cpp:60:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v1[nod].size (); ++i) { ^ user.cpp: In function ‘void citire()’: user.cpp:19:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d", &N, &M); ^ user.cpp:22:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d", &x, &y); ^ user.cpp: In function ‘int main()’: user.cpp:106:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("felinare.in", "r", stdin); ^ user.cpp:107:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("felinare.out", "w", stdout); ^