Eroare de compilare: user.cpp:12:1: error: ‘vector’ does not name a type vector< vector<int> > a; ^~~~~~ user.cpp: In function ‘void Add(int)’: user.cpp:17:5: error: ‘a’ was not declared in this scope a[h].push_back(x); ^ user.cpp: In function ‘void Delete(int)’: user.cpp:22:34: error: ‘a’ was not declared in this scope for (unsigned int i = 0; i < a[h].size(); i ++) ^ user.cpp: In function ‘bool Query(int)’: user.cpp:32:34: error: ‘a’ was not declared in this scope for (unsigned int i = 0; i < a[h].size(); i ++) ^ user.cpp: In function ‘int main()’: user.cpp:40:5: error: ‘a’ was not declared in this scope a = vector< vector<int> >(MOD); ^ user.cpp:40:9: error: ‘vector’ was not declared in this scope a = vector< vector<int> >(MOD); ^~~~~~ user.cpp:40:24: error: expected primary-expression before ‘int’ a = vector< vector<int> >(MOD); ^~~