View Compilation Error

0_0_28133163_28083.cpp: In function 'void solve()':
0_0_28133163_28083.cpp:25:22: error: 'memset' was not declared in this scope
  memset(V,0,sizeof(V));
                      ^
0_0_28133163_28083.cpp:30:2: error: 'cin' was not declared in this scope
  cin>>inn;
  ^