Compilare: user.cpp: In function ‘void Solve()’: user.cpp:115:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < V[vf].size(); ++i) ^ user.cpp: In function ‘void Read()’: user.cpp:90:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &n, &m, &k); ^ user.cpp:95:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^ user.cpp:101:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &x, &y, &cost); ^