Compilare: user.cpp: In function ‘int main()’: user.cpp:65:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < edge.size(); ++j) p[j] = j; ^ user.cpp:72:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < edge.size(); ++j) ^ user.cpp:52:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("desen.in","r",stdin); ^ user.cpp:53:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("desen.out","w",stdout); ^ user.cpp:55:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:59:49: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &point[i].F, &point[i].S); ^