Compilare: user.cpp: In function ‘void convexHull()’: user.cpp:42:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 1; i < init.size(); ++ i) ^ user.cpp:49:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < init.size()) { ^ user.cpp: In function ‘double dmax(POINT, double, int&)’: user.cpp:88:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < p.size(); ++ i) { ^ user.cpp: In function ‘int main()’: user.cpp:129:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < p.size(); ++ i) { ^ user.cpp:116:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rubarba.in", "r", stdin); ^ user.cpp:117:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rubarba.out", "w", stdout); ^ user.cpp:121:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp: In member function ‘void POINT::read()’: user.cpp:20:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf%lf", &x, &y); ^