View Compilation Error

0_0_16212296_1561.cpp: In function 'int StoerWagner(int)':
0_0_16212296_1561.cpp:13:26: error: 'memset' was not declared in this scope
  memset(d,false,sizeof(d));//表示是否已被合并
                          ^
0_0_16212296_1561.cpp: In function 'bool BFS(int)':
0_0_16212296_1561.cpp:53:34: error: 'memset' was not declared in this scope
  memset(visit,false,sizeof(visit));
                                  ^
0_0_16212296_1561.cpp: In function 'int main()':
0_0_16212296_1561.cpp:77:23: error: 'memset' was not declared in this scope
   memset(g,0,sizeof(g));
                       ^