View Compilation Error

0_0_21632953_30005.cpp: In function 'void Dijkstra()':
0_0_21632953_30005.cpp:38:26: error: 'memset' was not declared in this scope
  memset(Vis,0,sizeof(Vis));
                          ^
0_0_21632953_30005.cpp: In function 'void ReaData()':
0_0_21632953_30005.cpp:62:31: error: 'memset' was not declared in this scope
  memset(Edge,INF1,sizeof(Edge));
                               ^