View Compilation Error

0_0_29150393_26841.cpp: In function 'void solve(int, int, int, int, int)':
0_0_29150393_26841.cpp:75:24: error: 'flagl' was not declared in this scope
  if (qstart <= mid && !flagl) solve(rt << 1, l, mid, qstart, qend);
                        ^
0_0_29150393_26841.cpp:76:21: error: 'flagr' was not declared in this scope
  if (qend > mid && !flagr) solve(rt << 1 | 1, mid + 1, r, qstart, qend);
                     ^