View Compilation Error

0_0_19363576_11505.cpp: In function 'long long int query(int, int, int, int, int)':
0_0_19363576_11505.cpp:45:27: error: 'tree' was not declared in this scope
  if (ql==l&&qr==r) return tree[now].sum;
                           ^
0_0_19363576_11505.cpp:46:24: error: 'tree' was not declared in this scope
  ll temp=1ll*(qr-ql+1)*tree[now].lazy;
                        ^