Compilare: user.cpp: In function ‘void solve(int)’: user.cpp:30:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<fii[nod].size(); i++) ^ user.cpp:33:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<G[fii[nod][i]].size(); j++) ^ user.cpp:49:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<G[nod].size(); i++) ^ user.cpp:59:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<G[nod].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:102:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<G[i].size(); j++) ^ user.cpp:105:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k=0; k<G[T[i]].size(); k++) ^ user.cpp:66:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("mesaj3.in", "r", stdin); ^ user.cpp:67:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("mesaj3.out", "w", stdout); ^ user.cpp:69:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &N); ^ user.cpp:73:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d", &x, &y); ^ user.cpp:81:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &M); ^ user.cpp:85:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d %d", &x, &y, &C[i]); ^