Compilare: user.cpp: In function ‘int64_t getArea(const std::vector<Point>&)’: user.cpp:27:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < P.size(); i++) Area += llabs(Det(P[0], P[i - 1], P[i])); ^ user.cpp: In function ‘std::vector<Point> getConvex(const std::vector<Point>&)’: user.cpp:38:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 2; i < P.size(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:94:7: warning: unused variable ‘bestFirst’ [-Wunused-variable] int bestFirst, bestSecond; ^ user.cpp:94:18: warning: unused variable ‘bestSecond’ [-Wunused-variable] int bestFirst, bestSecond; ^ user.cpp:85:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("gradina.in", "r", stdin); ^ user.cpp:86:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("gradina.out", "w", stdout); ^ user.cpp:88:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^ user.cpp:89:63: 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", &P[i].x, &P[i].y); ^