Compilare: user.cpp: In function ‘void BellMan_Ford_X_Y()’: user.cpp:52:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<G[nod].size(); i++) ^ user.cpp: In function ‘void BellMan_Ford_Y_X()’: user.cpp:75:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<G[nod].size(); i++) ^ user.cpp: In function ‘void read()’: user.cpp:23:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d", &n, &m, &X, &Y); ^ user.cpp:28:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &x, &y); ^