Compilare: user.cpp: In function ‘double dr(int, int, int, int)’: user.cpp:54:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(p1.size() >= k && p1[k - 1] < ret) ^ user.cpp:56:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(p2.size() >= k && p2[k - 1] < ret) ^ user.cpp: In function ‘int main()’: user.cpp:63:33: 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:64:35: 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:68:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^ user.cpp:70:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x[i], &y[i]); ^