View Compilation Error

0_0_10287533_16877.cpp:11: error: `Void' does not name a type
0_0_10287533_16877.cpp: In function `int query(int, int, int)':
0_0_10287533_16877.cpp:50: error: non-lvalue in assignment
0_0_10287533_16877.cpp: In function `int main()':
0_0_10287533_16877.cpp:63: error: `i' undeclared (first use this function)
0_0_10287533_16877.cpp:63: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_10287533_16877.cpp:69: error: `sort' undeclared (first use this function)
0_0_10287533_16877.cpp:77: error: `build_tree' undeclared (first use this function)