Compilare: user.cpp: In member function ‘convex convex::merge_convex(convex&)’: user.cpp:66:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=2; i<ans.v.size(); i++) ~^~~~~~~~~~~~~ user.cpp: In member function ‘void ARBINT::make_tree(int, int, int)’: user.cpp:94:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<aint[nod].v.size(); i++) ~^~~~~~~~~~~~~~~~~~~ user.cpp:108:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<aint[nod].v.size(); i++) ~^~~~~~~~~~~~~~~~~~~ user.cpp: In member function ‘bool ARBINT::query(int, int, int, int, int, line)’: user.cpp:132:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(mid == aint[nod].v.size() - 1)return false; ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:159:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tri3.in", "r", stdin); ^ user.cpp:160:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tri3.out", "w", stdout); ^ user.cpp:162:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &Q); ^ user.cpp:166:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^ user.cpp:174:46: 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); ^