View Compilation Error

0_0_22527685_517.cpp: In member function 'bool Dinic::BFS()':
0_0_22527685_517.cpp:58:25: error: 'memset' was not declared in this scope
   memset(b, 0, sizeof(b));
                         ^
0_0_22527685_517.cpp: In member function 'int Dinic::MaxFlow(unsigned int, unsigned int)':
0_0_22527685_517.cpp:99:30: error: 'memset' was not declared in this scope
    memset(cur, 0, sizeof(cur));
                              ^
0_0_22527685_517.cpp: In function 'void Input(Dinic&)':
0_0_22527685_517.cpp:107:28: error: 'memset' was not declared in this scope
  memset(Dif, 0, sizeof(Dif));
                            ^