View Compilation Error

0_0_15770230_25821.cpp: In function 'void dijkstra()':
0_0_15770230_25821.cpp:11:28: error: 'memset' was not declared in this scope
  memset(vis, 0, sizeof(vis));
                            ^
0_0_15770230_25821.cpp: In function 'int main()':
0_0_15770230_25821.cpp:38:28: error: 'memset' was not declared in this scope
   memset(mp, -1, sizeof(mp));
                            ^