View Compilation Error

0_0_16108374_5471.cpp:34:9: error: stray '#' in program
     else#include <iostream>
         ^
0_0_16108374_5471.cpp: In function 'void build_tree(int, int, int)':
0_0_16108374_5471.cpp:34:10: error: 'include' was not declared in this scope
     else#include <iostream>
          ^
0_0_16108374_5471.cpp:34:27: error: expected primary-expression before '>' token
     else#include <iostream>
                           ^
0_0_16108374_5471.cpp:47:1: error: expected primary-expression before 'using'
 using namespace std;
 ^
0_0_16108374_5471.cpp:59:1: error: a function-definition is not allowed here before '{' token
 {
 ^
0_0_16108374_5471.cpp:242:1: error: expected '}' at end of input
 }
 ^