View Compilation Error

0_0_24693777_6944.cpp: In function 'void Dijkstra(int)':
0_0_24693777_6944.cpp:16:9: error: 'used' was not declared in this scope
         used[i]=false;  
         ^
0_0_24693777_6944.cpp:25:18: error: 'used' was not declared in this scope
             if( !used[u] && ( v==-1 || d[u]<d[v]) )  
                  ^
0_0_24693777_6944.cpp:28:9: error: 'used' was not declared in this scope
         used[v]=true;  
         ^
0_0_24693777_6944.cpp:31:44: error: 'Min' was not declared in this scope
             d[u]=Min( d[u],d[v]+cost[v][u] );  
                                            ^