class Node:
def __init__(self, l, r):
self.left = None
self.right = None
self.l = l
self.r = r
self.mid = (l + r) >> 1
self.v = 0
self.add = 0
class SegmentTree:
def __init__(self):
self.root = Node(1, 10**5 + 10)
def modify(self, l, r, v, node=None):
if l > r:
return
if node is None:
node = self.root
if node.l >= l and node.r <= r:
node.v = node.r - node.l + 1
node.add = v
return
self.pushdown(node)
if l <= node.mid:
self.modify(l, r, v, node.left)
if r > node.mid:
self.modify(l, r, v, node.right)
self.pushup(node)
def query(self, l, r, node=None):
if l > r:
return 0
if node is None:
node = self.root
if node.l >= l and node.r <= r:
return node.v
self.pushdown(node)
v = 0
if l <= node.mid:
v += self.query(l, r, node.left)
if r > node.mid:
v += self.query(l, r, node.right)
return v
def pushup(self, node):
node.v = node.left.v + node.right.v
def pushdown(self, node):
if node.left is None:
node.left = Node(node.l, node.mid)
if node.right is None:
node.right = Node(node.mid + 1, node.r)
if node.add:
left, right = node.left, node.right
left.v = left.r - left.l + 1
right.v = right.r - right.l + 1
left.add = node.add
right.add = node.add
node.add = 0
class Solution:
def amountPainted(self, paint: List[List[int]]) -> List[int]:
tree = SegmentTree()
res = []
for i, (start, end) in enumerate(paint):
l, r = start + 1, end
v = tree.query(l, r)
res.append(r - l + 1 - v)
tree.modify(l, r, 1)
return res