View Compilation Error

0_0_24822399_9900.cpp: In function 'void work()':
0_0_24822399_9900.cpp:33:3: error: 'du' was not declared in this scope
   du[from]++;du[to]++; 
   ^
0_0_24822399_9900.cpp:37:6: error: 'du' was not declared in this scope
   if(du[i]&1)as=0;
      ^