結果

問題 No.2321 Continuous Flip
ユーザー lam6er
提出日時 2025-04-09 20:56:09
言語 PyPy3
(7.3.15)
結果
TLE  
実行時間 -
コード長 3,800 bytes
コンパイル時間 340 ms
コンパイル使用メモリ 82,296 KB
実行使用メモリ 55,340 KB
最終ジャッジ日時 2025-04-09 20:57:41
合計ジャッジ時間 7,766 ms
ジャッジサーバーID
（参考情報） 		judge4 / judge1
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 4
other TLE * 1 -- * 29
権限があれば一括ダウンロードができます

ソースコード

diff # 

import sys
import heapq

class SegmentTreeNode:
    def __init__(self, left, right):
        self.left = left
        self.right = right
        self.even_sum = 0
        self.odd_sum = 0
        self.flipped = False
        self.left_child = None
        self.right_child = None

class SegmentTree:
    def __init__(self, data):
        self.n = len(data)
        self.root = self.build_tree(data, 0, self.n - 1)
    
    def build_tree(self, data, l, r):
        node = SegmentTreeNode(l, r)
        if l == r:
            node.even_sum = data[l]
            node.odd_sum = 0
            return node
        mid = (l + r) // 2
        node.left_child = self.build_tree(data, l, mid)
        node.right_child = self.build_tree(data, mid + 1, r)
        node.even_sum = node.left_child.even_sum + node.right_child.even_sum
        node.odd_sum = node.left_child.odd_sum + node.right_child.odd_sum
        return node
    
    def push_down(self, node):
        if node.flipped and node.left_child:
            node.left_child.flipped = not node.left_child.flipped
            node.left_child.even_sum, node.left_child.odd_sum = node.left_child.odd_sum, node.left_child.even_sum
            node.right_child.flipped = not node.right_child.flipped
            node.right_child.even_sum, node.right_child.odd_sum = node.right_child.odd_sum, node.right_child.even_sum
            node.flipped = False
    
    def flip_range(self, l, r):
        self._flip_range(self.root, l, r)
    
    def _flip_range(self, node, l, r):
        if node.right < l or node.left > r:
            return
        if l <= node.left and node.right <= r:
            node.even_sum, node.odd_sum = node.odd_sum, node.even_sum
            node.flipped = not node.flipped
            return
        self.push_down(node)
        self._flip_range(node.left_child, l, r)
        self._flip_range(node.right_child, l, r)
        node.even_sum = node.left_child.even_sum + node.right_child.even_sum
        node.odd_sum = node.left_child.odd_sum + node.right_child.odd_sum
    
    def query_sum(self, l, r):
        return self._query_sum(self.root, l, r)
    
    def _query_sum(self, node, l, r):
        if node.right < l or node.left > r:
            return (0, 0)
        if l <= node.left and node.right <= r:
            return (node.even_sum, node.odd_sum)
        self.push_down(node)
        left_even, left_odd = self._query_sum(node.left_child, l, r)
        right_even, right_odd = self._query_sum(node.right_child, l, r)
        return (left_even + right_even, left_odd + right_odd)

def main():
    import sys
    input = sys.stdin.read
    data = input().split()
    ptr = 0
    N = int(data[ptr])
    ptr +=1
    M = int(data[ptr])
    ptr +=1
    C = int(data[ptr])
    ptr +=1
    A = list(map(int, data[ptr:ptr+N]))
    ptr +=N
    intervals = []
    for _ in range(M):
        L = int(data[ptr])-1
        ptr +=1
        R = int(data[ptr])-1
        ptr +=1
        intervals.append( (L, R) )
    
    st = SegmentTree(A)
    heap = []
    for i in range(M):
        L, R = intervals[i]
        even, odd = st.query_sum(L, R)
        gain = even - odd - C
        heapq.heappush(heap, (-gain, i, L, R))
    
    total = 0
    processed = set()
    while heap:
        neg_gain, i, L, R = heapq.heappop(heap)
        gain = -neg_gain
        if gain <=0:
            continue
        current_even, current_odd = st.query_sum(L, R)
        current_gain = current_even - current_odd - C
        if current_gain != gain:
            if current_gain >0:
                heapq.heappush(heap, (-current_gain, i, L, R))
            continue
        total += current_gain
        st.flip_range(L, R)
        heapq.heappush(heap, (-current_gain, i, L, R))
    
    print(total)
    
if __name__ == "__main__":
    main()
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