View Compilation Error

0_0_38605332_14889.cpp:12:1: error: 'vector' does not name a type; did you mean 'wctob'?
 vector<int>a[N];
 ^~~~~~
 wctob
0_0_38605332_14889.cpp: In function 'long long int kmp(long long int)':
0_0_38605332_14889.cpp:19:11: error: 'a' was not declared in this scope
  int sz = a[x].size();
           ^
0_0_38605332_14889.cpp: In function 'void solve()':
0_0_38605332_14889.cpp:39:3: error: 'a' was not declared in this scope
   a[i % k].push_back(x);
   ^
0_0_38605332_14889.cpp:58:29: error: 'a' was not declared in this scope
  for (int i = 0; i < k; i++)a[i].clear();
                             ^