View Compilation Error

0_0_17570395_2231.cpp: In function 'void init(int)':
0_0_17570395_2231.cpp:23:9: error: 'v' was not declared in this scope
         v[i].clear();  
         ^
0_0_17570395_2231.cpp: In function 'void dfs(int, int)':
0_0_17570395_2231.cpp:47:19: error: 'v' was not declared in this scope
     for(int j=0;j<v[i].size();j++)  
                   ^
0_0_17570395_2231.cpp:50:20: error: 'struct nod' has no member named 'to'
         if(vis[nex.to])  continue;  
                    ^
0_0_17570395_2231.cpp:51:20: error: 'struct nod' has no member named 'to'
         Tarjan(nex.to,val+nex.id);  
                    ^
0_0_17570395_2231.cpp:51:33: error: 'Tarjan' was not declared in this scope
         Tarjan(nex.to,val+nex.id);  
                                 ^
0_0_17570395_2231.cpp:52:18: error: 'struct nod' has no member named 'to'
         un(i,nex.to);  
                  ^