View Compilation Error

0_0_32020184_9424.cpp: In function 'void dijsktra(int)':
0_0_32020184_9424.cpp:13:32: error: 'memset' was not declared in this scope
  memset(Zheng, 0, sizeof(Zheng));
                                ^
0_0_32020184_9424.cpp: In function 'int main()':
0_0_32020184_9424.cpp:36:29: error: 'memset' was not declared in this scope
   memset(Lu, Max, sizeof(Lu));
                             ^