View Compilation Error

0_0_32582413_774.cpp: In function 'int main()':
0_0_32582413_774.cpp:13:9: error: 'vector' was not declared in this scope
         vector<int> w; for (int i = 0; i < 50009; i += 1) w.push_back(i);
         ^
0_0_32582413_774.cpp:13:16: error: expected primary-expression before 'int'
         vector<int> w; for (int i = 0; i < 50009; i += 1) w.push_back(i);
                ^
0_0_32582413_774.cpp:13:59: error: 'w' was not declared in this scope
         vector<int> w; for (int i = 0; i < 50009; i += 1) w.push_back(i);
                                                           ^