View Compilation Error

0_0_3881251_4635.cpp: In function `int getsum(int)':
0_0_3881251_4635.cpp:13: error: `tree' undeclared (first use this function)
0_0_3881251_4635.cpp:13: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_3881251_4635.cpp: In function `void update(int, int)':
0_0_3881251_4635.cpp:22: error: `tree' undeclared (first use this function)