View Compilation Error

0_0_21439654_29352.cpp: In member function 'int RXD_and_dividing::dfs(int)':
0_0_21439654_29352.cpp:31:3: error: 'num' was not declared in this scope
   num[id]=1;
   ^
0_0_21439654_29352.cpp: In member function 'void RXD_and_dividing::work()':
0_0_21439654_29352.cpp:57:13: error: 'num' was not declared in this scope
    ans+=min(num[i],K)*1ll*dist[id].val;
             ^
0_0_21439654_29352.cpp:57:32: error: 'id' was not declared in this scope
    ans+=min(num[i],K)*1ll*dist[id].val;
                                ^