#775005 (PyPy3) No.1995 CHIKA Road

• 問題: No.1995 CHIKA Road
• ユーザー: 👑 rin204
• 提出日時: 2022-07-01 21:45:30
• 言語: PyPy3 (7.3.15)
• 結果: AC
• 実行時間: 483 ms / 2,000 ms
• コード長: 2,030 bytes
• コンパイル時間: 294 ms
• コンパイル使用メモリ: 82,048 KB
• 実行使用メモリ: 167,228 KB
• 最終ジャッジ日時: 2024-11-26 04:35:19
• 合計ジャッジ時間: 10,368 ms
• ジャッジサーバーID （参考情報）: judge4 / judge3

ファイルパターン	結果
sample	AC * 3
other	AC * 37

ソースコード

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class SegTree:
    def __init__(self, n, e, ope, lst=[]):
        self.N0 = 2 ** (n - 1).bit_length()
        self.e = e
        self.ope = ope
        self.data = [e] * (2 * self.N0)
        if lst:
            for i in range(n):
                self.data[self.N0 + i] = lst[i]
            for i in range(self.N0 - 1, 0, -1):
                self.data[i] = self.ope(self.data[2 * i], self.data[2 * i + 1])
    
    def build(self):
        for i in range(self.N0 - 1, 0, -1):
            self.data[i] = self.ope(self.data[2 * i], self.data[2 * i + 1])
                
    def update(self, i, x): #a_iの値をxに更新
        i += self.N0
        self.data[i] = x
        while i > 1:
            i >>= 1
            self.data[i] = self.ope(self.data[2 * i], self.data[2 * i + 1])
    
    def add(self, i, x):
        self.update(i, x + self.get(i))
    def set(self, i, x):
        self.data[self.N0 + i] = x
    
    def query(self, l, r): #区間[l, r)での演算結果
        if r <= l:
            return self.e
        lres = self.e
        rres = self.e
        l += self.N0
        r += self.N0
        while l < r:
            if l & 1:
                lres = self.ope(lres, self.data[l])
                l += 1
            if r & 1:
                r -= 1
                rres = self.ope(self.data[r], rres)
            l >>= 1
            r >>= 1
        return self.ope(lres, rres)
    
    def get(self, i): #a_iの値を返す
        return self.data[self.N0 + i]
n, m = map(int, input().split())
se = set()
ab = [list(map(int, input().split())) for _ in range(m)]
for a, b in ab:
    se.add(a)
    se.add(b)
se.add(1)
le = len(se)
lst = sorted(se)
dic = {l:i for i, l in enumerate(lst)}
R = [[] for _ in range(le)]
for a, b in ab:
    a = dic[a]
    b = dic[b]
    R[b].append(a)
seg = SegTree(le, -1 << 30, max)
seg.update(0, 0)
for r in range(le):
    for l in R[r]:
        tmp = seg.query(0, l + 1) + 1
        if seg.get(r) < tmp:
            seg.update(r, tmp)
print(2 * (n - 1) - seg.query(0, le))
 
 
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