View Compilation Error

0_0_12052510_3881.cpp: In function `void lis(int*, int)':
0_0_12052510_3881.cpp:58: error: `a' undeclared (first use this function)
0_0_12052510_3881.cpp:58: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_12052510_3881.cpp:58: error: expected `;' before "else"