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View Compilation Error

0_0_20294622_20519.cpp:13:2: error: 'Tree' does not name a type
  Tree *left = NULL, *right = NULL;
  ^
0_0_20294622_20519.cpp: In function 'Tree* build(int, int, int*)':
0_0_20294622_20519.cpp:18:3: error: 'Root' was not declared in this scope
   Root = new Tree;
   ^


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