View Compilation Error

0_0_37810796_24478.cpp: In function 'int dfs(int, int)':
0_0_37810796_24478.cpp:17:2: error: 'sz' was not declared in this scope
  sz[u]=1;
  ^
0_0_37810796_24478.cpp: In function 'void dp(int, int)':
0_0_37810796_24478.cpp:27:9: error: 'sz' was not declared in this scope
  sum[u]=sz[u];
         ^