Блог пользователя wadhwasahil

Lazy Propagation in segment tree
Автор wadhwasahil, история, 9 лет назад, По-английски

I know about segment trees. But here I am stuck.I want to set all the values within an interval [l,r] to a constant c. and now after doing all the updates on the array, I want to find a[i] where 0<i<=n.

  • Проголосовать: нравится
  • -6
  • Проголосовать: не нравится

»
9 лет назад, # |
  Проголосовать: нравится -6 Проголосовать: не нравится

I want the ith element a[i] after many updations .

a[]={1,2,3,4,5};

query1=1 4 3 // this means change the value of all elements to 3 in the range [1,4] so after first query a becomes a[]={3,3,3,3,4,5};

query2= 3 4 1 // this means change the value of all elements to 4 in range [3,4] a become a[]={3,3,1,1,4,5}

so I want the value of a[3](which is 1 in this case) after many queries. Hope you guys understood the question.

→ Ответить