Compilare: user.cpp: In function ‘std::pair<Point, Point> bsD(std::vector<Point>, Line)’: user.cpp:112:10: warning: unused variable ‘d1’ [-Wunused-variable] double d1 = dist(hull[(int)(hull.size()) - 1], l); ^ user.cpp:113:10: warning: unused variable ‘d2’ [-Wunused-variable] double d2 = dist(hull[last2], l); ^ user.cpp: In function ‘void build(int, int, int)’: user.cpp:133:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < h.size(); ++i) ^ user.cpp:147:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 2; i < h.size(); ++i){ ^ user.cpp: In function ‘int main()’: user.cpp:209:33: 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:210:35: 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:213:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &K, &M); ^ user.cpp:215:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &v[i].P.x, &v[i].P.y); ^ user.cpp:235:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &A.x, &A.y); ^ user.cpp:236:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &B.x, &B.y); ^