View Compilation Error

0_0_33258284_21819.cpp: In function 'int main()':
0_0_33258284_21819.cpp:80:41: error: 'qu' was not declared in this scope
                 las_ans = tree[1] > r ? qu
                                         ^
0_0_33258284_21819.cpp:80:41: error: expected ':' at end of input
0_0_33258284_21819.cpp:80:41: error: expected primary-expression at end of input
0_0_33258284_21819.cpp:80:41: error: expected '}' at end of input
0_0_33258284_21819.cpp:80:41: error: expected '}' at end of input
0_0_33258284_21819.cpp:80:41: error: expected '}' at end of input
0_0_33258284_21819.cpp:80:41: error: expected '}' at end of input