Compilare: user.cpp: In function ‘void solve(int, int)’: user.cpp:43:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < P[nod].size(); ++ i) ^ user.cpp:53:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < V[nod].size(); ++ i) ^ user.cpp: In function ‘void read()’: user.cpp:16:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pitici.in", "r", stdin); ^ user.cpp:17:34: 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:21:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &a, &b, &c); ^ user.cpp: In function ‘void write()’: user.cpp:72:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pitici.out", "w", stdout); ^