View Compilation Error

0_0_37106529_1331.cpp: In function 'bool check(int, int, int)':
0_0_37106529_1331.cpp:33:26: error: 'x' was not declared in this scope
  if (d>1 && query(le,ri, x)<1){
                          ^
0_0_37106529_1331.cpp: In function 'void solve()':
0_0_37106529_1331.cpp:52:11: error: 'read' was not declared in this scope
  n = read(), m = read();
           ^