View Compilation Error

0_0_18901965_8039.cpp: In function 'bool dinic_bfs()':
0_0_18901965_8039.cpp:18:33: 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_18901965_8039.cpp: In function 'int main()':
0_0_18901965_8039.cpp:75:35: error: 'memset' was not declared in this scope
         memset(edge,0,sizeof(edge));  
                                   ^