View Compilation Error

0_0_8699495_25828.cpp: In function `int LIS(const int*, const int&)':
0_0_8699495_25828.cpp:24: error: `prea' undeclared (first use this function)
0_0_8699495_25828.cpp:24: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_8699495_25828.cpp: In function `int LISD(const int*, const int&)':
0_0_8699495_25828.cpp:43: error: `preb' undeclared (first use this function)