View Compilation Error

0_0_33377125_26040.cpp: In function 'int ok(int, int, int, int)':
0_0_33377125_26040.cpp:127:16: error: 'lcp' was not declared in this scope
   if(lcp(mid, p) >= r-l+1) ed = mid;
                ^
0_0_33377125_26040.cpp:135:16: error: 'lcp' was not declared in this scope
   if(lcp(mid, p) >= r-l+1) st = mid;
                ^
0_0_33377125_26040.cpp: In function 'void erase(int, int, int&)':
0_0_33377125_26040.cpp:159:13: error: expected ')' at end of input
  while(ok(l+2
             ^
0_0_33377125_26040.cpp:159:13: error: expected ')' at end of input
0_0_33377125_26040.cpp:159:13: error: expected statement at end of input
0_0_33377125_26040.cpp:159:13: error: expected '}' at end of input