View Compilation Error

0_0_33031367_11911.cpp: In function 'int main()':
0_0_33031367_11911.cpp:67:29: error: 'Q' was not declared in this scope
     while(~scanf("%d%d",&n,&Q))
                             ^
0_0_33031367_11911.cpp:82:25: error: 'u' was not declared in this scope
             int LCA=lca(u,v);
                         ^
0_0_33031367_11911.cpp:82:27: error: 'v' was not declared in this scope
             int LCA=lca(u,v);
                           ^