View Compilation Error

0_0_3170168_25113.cpp: In function `void solve()':
0_0_3170168_25113.cpp:126: error: `ik' undeclared (first use this function)
0_0_3170168_25113.cpp:126: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_3170168_25113.cpp:126: error: `k' undeclared (first use this function)