#744974 (Python3) No.1868 Teleporting Cyanmond

• 問題: No.1868 Teleporting Cyanmond
• ユーザー: tktk_snsn
• 提出日時: 2022-03-11 21:42:41
• 言語: Python3 (3.13.1 + numpy 2.2.1 + scipy 1.14.1)
• 結果: AC
• 実行時間: 380 ms / 2,000 ms
• コード長: 3,494 bytes
• コンパイル時間: 256 ms
• コンパイル使用メモリ: 12,672 KB
• 実行使用メモリ: 20,844 KB
• 最終ジャッジ日時: 2024-09-16 01:54:37
• 合計ジャッジ時間: 4,998 ms
• ジャッジサーバーID （参考情報）: judge3 / judge1

ファイルパターン	結果
sample	AC * 3
other	AC * 25

ソースコード

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class SegTree(object):
    def __init__(self, N, op_data, u_data):
        self._n = N
        self.log = (N-1).bit_length()
        self.size = 1 << self.log
        self.op = op_data
        self.e = u_data
        self.data = [u_data] * (2 * self.size)
        # self.len = [1] * (2 * self.size)
    def __repr__(self):
        res = [self.get(i) for i in range(self._n)]
        return " ".join(map(str, res))
    def _update(self, i):
        self.data[i] = self.op(self.data[i << 1], self.data[i << 1 | 1])
    def initialize(self, arr=None):
        """ segtreeをarrで初期化する。len(arr) == Nにすること """
        if arr:
            for i, a in enumerate(arr, self.size):
                self.data[i] = a
        for i in reversed(range(1, self.size)):
            self._update(i)
            # self.len[i] = self.len[i << 1] + self.len[i << 1 | 1]
    def update(self, p, x):
        """ data[p] = x とする (0-indexed)"""
        p += self.size
        self.data[p] = x
        for i in range(1, self.log + 1):
            self._update(p >> i)
    def get(self, p):
        """ data[p]を返す """
        return self.data[p + self.size]
    def prod(self, l, r):
        """
        op_data(data[l], data[l+1], ..., data[r-1])を返す (0-indexed)
        """
        sml = self.e
        smr = self.e
        l += self.size
        r += self.size
        while l < r:
            if l & 1:
                sml = self.op(sml, self.data[l])
                l += 1
            if r & 1:
                r -= 1
                smr = self.op(self.data[r], smr)
            l >>= 1
            r >>= 1
        return self.op(sml, smr)
    def all_prod(self):
        """ op(data[0], data[1], ... data[N-1])を返す """
        return self.data[1]
    def max_right(self, l, func):
        """
        func(l, l+1, ..., r-1) = True,
        func(l, l+1, ..., r-1, r) = Falseとなる r を返す
        """
        if l == self._n:
            return self._n
        l += self.size
        sm = self.e
        while True:
            while l % 2 == 0:
                l >>= 1
            if not func(self.op(sm, self.data[l])):
                while l < self.size:
                    l <<= 1
                    if func(self.op(sm, self.data[l])):
                        sm = self.op(sm, self.data[l])
                        l += 1
                return l - self.size
            sm = self.op(sm, self.data[l])
            l += 1
            if (l & -l) == l:
                break
        return self._n
    def min_left(self, r, func):
        """
        func(     l, l+1, ..., r-1) = True,
        func(l-1, l, l+1, ..., r-1) = Falseとなる l を返す
        """
        if r == 0:
            return 0
        r += self.size
        sm = self.e
        while True:
            r -= 1
            while r > 1 and r & 1:
                r >>= 1
            if not func(self.op(self.data[r], sm)):
                while r < self.size:
                    r = r << 1 | 1
                    if func(self.op(self.data[r], sm)):
                        sm = self.op(self.data[r], sm)
                        r -= 1
                return r + 1 - self.size
            sm = self.op(self.data[r], sm)
            if (r & -r) == r:
                break
        return 0
N = int(input())
A = list(map(int, input().split()))
seg = SegTree(N, max, 0)
seg.initialize(A)
ans = 0
now = 1
while now < N:
    now = seg.prod(0, now)
    ans += 1
print(ans)
 
 
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