View Compilation Error

0_0_15971708_16840.cpp: In function 'int find_kth(int)':
0_0_15971708_16840.cpp:9:12: error: 'maxn' was not declared in this scope
 if (ans >= maxn|| cnt + c[ans] >= k)
            ^
0_0_15971708_16840.cpp:9:25: error: 'c' was not declared in this scope
 if (ans >= maxn|| cnt + c[ans] >= k)
                         ^