View Compilation Error

0_0_34655940_5889.cpp: In function 'void Dijkstra(int)':
0_0_34655940_5889.cpp:10:31: error: 'memset' was not declared in this scope
     memset(used,0,sizeof(used));   
                               ^
0_0_34655940_5889.cpp: In function 'int main()':
0_0_34655940_5889.cpp:38:35: error: 'memset' was not declared in this scope
         memset(map,INF,sizeof(map));
                                   ^