Compilare: user.cpp: In function ‘void ins(int)’: user.cpp:44:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < H[i].size() && !q; j++) ^ user.cpp: In function ‘void del(int)’: user.cpp:52:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < H[i].size() && !q; j++) ^ user.cpp: In function ‘int query(int)’: user.cpp:62:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < H[i].size() && !q; j++) ^ user.cpp: In function ‘int main()’: user.cpp:17:35: 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:18:37: 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:20:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &m); ^ user.cpp:22:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &a, &x); ^