Compilare: user.cpp: In function ‘int main()’: user.cpp:51:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (st.size() >= K) ^ user.cpp:57:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (dr.size() >= K) ^ user.cpp:26:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("geom.in","r",stdin); ^ user.cpp:27:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("geom.out","w",stdout); ^ user.cpp:29:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &K); ^ user.cpp:32:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &A[i].x, &A[i].y); ^