Compilare: user.cpp: In function ‘void printtreex(int, int, int)’: user.cpp:66:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<arb[nod].x.size();i++) printf("%d ",arb[nod].x[i]); ^ user.cpp:66:73: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘__gnu_cxx::__alloc_traits<std::allocator<point> >::value_type {aka point}’ [-Wformat=] for (int i=0;i<arb[nod].x.size();i++) printf("%d ",arb[nod].x[i]); ^ user.cpp:74:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<arb[nod].x.size();i++) printf("%d ",arb[nod].x[i]); ^ user.cpp:74:73: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘__gnu_cxx::__alloc_traits<std::allocator<point> >::value_type {aka point}’ [-Wformat=] for (int i=0;i<arb[nod].x.size();i++) printf("%d ",arb[nod].x[i]); ^ user.cpp: In function ‘int main()’: user.cpp:170:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zoo.in","r",stdin); ^ user.cpp:171:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zoo.out","w",stdout); ^ user.cpp:173:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:175:58: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (int i=1;i<=n;i++) scanf("%d %d",&t[i].x,&t[i].y); ^ user.cpp:179:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&m); ^ user.cpp:182:45: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d",&x1,&y1,&x2,&y2); sol=0; ^