View Compilation Error

0_0_26919396_5909.cpp: In function 'void Push_up(int)':
0_0_26919396_5909.cpp:59:19: error: 'lch' was not declared in this scope
     tr[x].sz = tr[lch].sz + tr[rch].sz + tr[x].szz;
                   ^
0_0_26919396_5909.cpp:59:32: error: 'rch' was not declared in this scope
     tr[x].sz = tr[lch].sz + tr[rch].sz + tr[x].szz;
                                ^
0_0_26919396_5909.cpp: In function 'void Delete(long long int)':
0_0_26919396_5909.cpp:122:5: error: 'rch' was not declared in this scope
     rch = 0;
     ^
0_0_26919396_5909.cpp:123:16: error: 'lch' was not declared in this scope
     LL sz = tr[lch].sz;
                ^