Compilare: user.cpp: In function ‘int anc(int, int)’: user.cpp:13:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(l[x].size() < pow + 1) ^ user.cpp: In function ‘int main()’: user.cpp:38:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(l[i].size() > cnt && l[l[i][cnt]].size() > cnt && l[l[i][cnt]][cnt]){ ^ user.cpp:38:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(l[i].size() > cnt && l[l[i][cnt]].size() > cnt && l[l[i][cnt]][cnt]){ ^ user.cpp:24:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("stramosi.in", "r", stdin); ^ user.cpp:25:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("stramosi.out", "w", stdout); ^ user.cpp:26:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:28:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &p[i]); ^ user.cpp:45:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^