View Compilation Error

0_0_33781102_27907.cpp: In member function 'll fhqTreap::push(int, int)':
0_0_33781102_27907.cpp:208:37: error: 'c' was not declared in this scope
       if (sz == x) return a = merge(c, d), 0;
                                     ^
0_0_33781102_27907.cpp:208:37: note: suggested alternative:
0_0_33781102_27907.cpp:31:75: note:   'FastIO::c'
   char ibuf[SIZE], *iS, *iT, obuf[SIZE], *oS = obuf, *oT = oS + SIZE - 1, c, qu[100]; int f, qr;
                                                                           ^
0_0_33781102_27907.cpp:208:40: error: 'd' was not declared in this scope
       if (sz == x) return a = merge(c, d), 0;
                                        ^