Compilare: user.cpp: In function ‘int main()’: user.cpp:103:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i<arb.size(); ++i) ^ user.cpp:73:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("politie.in","r",stdin); ^ user.cpp:74:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("politie.out","w",stdout); ^ user.cpp:76:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &n, &m, &d, &p); ^ user.cpp:80:74: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &muc[i].x, &muc[i].y, &muc[i].cat, &muc[i].per); ^