View Compilation Error

0_0_14712050_16066.cpp: In function 'void dfs(int, int)':
0_0_14712050_16066.cpp:34:33: error: 'memset' was not declared in this scope
  memset(g[cur], 0xC0, K + 1 << 3);
                                 ^
0_0_14712050_16066.cpp: In function 'void work()':
0_0_14712050_16066.cpp:60:29: error: 'memset' was not declared in this scope
  memset(pre, -1, sizeof(pre));
                             ^