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View Compilation Error

0_0_6290993_30193.cpp: In function `int query(int, int, int)':
0_0_6290993_30193.cpp:37: error: `tree' undeclared (first use this function)
0_0_6290993_30193.cpp:37: error: (Each undeclared identifier is reported only once for each function it appears in.)


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