View Compilation Error

0_0_28874691_22114.cpp: In function 'bool dinic_bfs()':
0_0_28874691_22114.cpp:18:30: error: 'memset' was not declared in this scope
  memset(level,0,sizeof(level));//初始化顶点的层次 为0
                              ^
0_0_28874691_22114.cpp: In function 'int main()':
0_0_28874691_22114.cpp:75:29: error: 'memset' was not declared in this scope
   memset(edge,0,sizeof(edge));
                             ^