Compilare: user.cpp: In function ‘int main()’: user.cpp:68:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<D.size(); ++i) ^ user.cpp:71:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<D.size(); ++i) ^ user.cpp:75:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1; j<D[i].p.size(); ++j) ^ user.cpp:85:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<D.size(); ++i) ^ user.cpp:39:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cerc3.in", "rt", stdin); ^ user.cpp:40:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cerc3.out", "wt", stdout); ^ user.cpp:44:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^ user.cpp:47:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &xc, &yc, &r); ^