Compilare: user.cpp: In function ‘void insert(int)’: user.cpp:31:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < H[p].size(); j++) ^ user.cpp: In function ‘void erase(int)’: user.cpp:43:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < H[p].size(); j++) ^ user.cpp: In function ‘int find(int)’: user.cpp:56:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < H[p].size(); j++) ^ user.cpp: In function ‘int main()’: user.cpp:14:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("hashuri.in", "r", stdin); ^ user.cpp:15:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("hashuri.out", "w", stdout); ^ user.cpp:16:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:18:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &op, &x); ^