View Compilation Error

0_0_37767498_16472.cpp: In function 'int querry_tree(int, int, int, int, int)':
0_0_37767498_16472.cpp:57:19: error: 'maxn_right' was not declared in this scope
   if (maxn_left > maxn_right)
                   ^
0_0_37767498_16472.cpp:59:10: error: 'maxn_right' was not declared in this scope
   return maxn_right;
          ^