View Compilation Error

0_0_13499274_5537.cpp: In function 'void init(int)':
0_0_13499274_5537.cpp:24:29: error: 'memset' was not declared in this scope
  memset(res, -1, sizeof(res));
                             ^
0_0_13499274_5537.cpp: In function 'int main()':
0_0_13499274_5537.cpp:44:30: error: 'memset' was not declared in this scope
    memset(vis, 0, sizeof(vis));
                              ^