Compilare: user.cpp: In member function ‘void ramase::add_point(int)’: user.cpp:56:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (topX.size() > n / 3) { ^ user.cpp: In member function ‘void ramase::remove_point(int)’: user.cpp:65:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (topX.size() < n / 3 && R.size() > 0) { ^ user.cpp: In function ‘int main()’: user.cpp:139:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (T1.size() > n / 3) { ^ user.cpp:144:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (T1.size() != n / 3 || R.topX.size() != n / 3) continue; ^ user.cpp:144:52: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (T1.size() != n / 3 || R.topX.size() != n / 3) continue; ^ user.cpp:119:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tri.in", "r", stdin); ^ user.cpp:120:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tri.out", "w", stdout); ^ user.cpp:121:77: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld %lld %lld %lld %lld %lld", &C.x, &C.y, &A.x, &A.y, &B.x, &B.y); ^ user.cpp:122:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:124:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld %lld", &v[i].x, &v[i].y); ^