Compilare: user.cpp: In function ‘double getArea(const std::vector<Point>&)’: user.cpp:28:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < P.size(); i++) Ar += fabs(Det(P[0], P[i - 1], P[i])); ^ user.cpp: In function ‘std::vector<Point> Reorder(const std::vector<Point>&)’: user.cpp:41:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = Pos; i < P.size(); i++) PP.push_back(P[i]); ^ user.cpp: In function ‘void Solve(std::vector<Point>&)’: user.cpp:86:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i++; i < P.size(); i++) Side2.push_back(P[i]); ^ user.cpp: In function ‘int main()’: user.cpp:106:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("split3.in", "r", stdin); ^ user.cpp:107:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("split3.out", "w", stdout); ^ user.cpp:109:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^ user.cpp:112:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf %lf", &P[i].x, &P[i].y); ^ user.cpp:113:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf %lf", &A.x, &A.y); ^