View Compilation Error

0_0_39325765_23027.cpp: In function 'void dfs(int, int)':
0_0_39325765_23027.cpp:26:26: error: 'i' was not declared in this scope
   26 |     for(int t=head[v];~t;i=es[t].nex){
      |                          ^
0_0_39325765_23027.cpp:31:34: error: 'w' was not declared in this scope
   31 |             dp[v][i]+=dp[u][0]+2*w;//非常重要
      |                                  ^