結果

問題 No.2854 -1 Subsequence
ユーザー rlangevin
提出日時 2024-09-10 00:46:11
言語 PyPy3
(7.3.15)
結果
WA  
実行時間 -
コード長 3,556 bytes
コンパイル時間 375 ms
コンパイル使用メモリ 82,380 KB
実行使用メモリ 112,592 KB
最終ジャッジ日時 2024-09-10 00:46:22
合計ジャッジ時間 9,162 ms
ジャッジサーバーID
（参考情報） 		judge2 / judge1
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ファイルパターン 結果
other AC * 30 WA * 10
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 #
プレゼンテーションモードにする

class SegmentTree:
    def __init__(self,
                n,
                identity_e,
                combine_f,
                ):
        self._n = n
        self._size = 1
        while self._size < self._n:
            self._size <<= 1
        self._identity_e = identity_e
        self._combine_f = combine_f
        self._node = [self._identity_e] * (2 * self._size)
    def build(self, array):
        assert len(array) == self._n
        for index, value in enumerate(array, start=self._size):
            self._node[index] = value
        for index in range(self._size - 1, 0, -1):
            self._node[index] = self._combine_f(
                self._node[index << 1 | 0],
                self._node[index << 1 | 1]
            )
    def update(self, index, value):
        i = self._size + index
        self._node[i] = value
        while i > 1:
            i >>= 1
            self._node[i] = self._combine_f(
                self._node[i << 1 | 0],
                self._node[i << 1 | 1]
            )
    def fold(self, L, R):
        L += self._size
        R += self._size
        value_L = self._identity_e
        value_R = self._identity_e
        while L < R:
            if L & 1:
                value_L = self._combine_f(value_L, self._node[L])
                L += 1
            if R & 1:
                R -= 1
                value_R = self._combine_f(self._node[R], value_R)
            L >>= 1
            R >>= 1
        return self._combine_f(value_L, value_R)
    def get(self, p):
        return self._node[p + self._size]
    def max_right(self, l, f):
        assert 0 <= l <= self._n
        assert f(self._identity_e)
        if l == self._n:
            return self._n
        l += self._size
        sm = self._identity_e
        while True:
            while l % 2 == 0:
                l >>= 1
            if not f(self._combine_f(sm, self._node[l])):
                while l < self._size:
                    l <<= 1
                    if f(self._combine_f(sm, self._node[l])):
                        sm = self._combine_f(sm, self._node[l])
                        l += 1
                return l - self._size
            sm = self._combine_f(sm, self._node[l])
            l += 1
            if l & -l == l:
                break
        return self._n
    def min_left(self, r, f):
        assert 0 <= r <= self._n
        assert f(self._identity_e)
        if r == 0:
            return 0
        r += self._size
        sm = self._identity_e
        while True:
            r -= 1
            while r > 1 and r % 2:
                r >>= 1
            if not f(self._combine_f(self._node[r], sm)):
                while r < self._size:
                    r = 2 * r + 1
                    if f(self._combine_f(self._node[r], sm)):
                        sm = self._combine_f(self._node[r], sm)
                        r -= 1
                return r + 1 - self._size
            sm = self._combine_f(self._node[r], sm)
            if r & -r == r:
                break
        return 0
    def __str__(self):
        temp = []
        for i in range(self._n):
            temp.append(str(self.fold(i, i + 1)))
        return ' '.join(temp)
N = int(input())
A = list(map(int, input().split()))
inf = 10 ** 18
dp0 = SegmentTree(N + 1, -inf, max)
dp1 = SegmentTree(N + 1, -inf, max)
dp1.update(0, 0)
for i in range(N):
    v0 = dp1.fold(0, i + 1) - A[i]
    v1 = dp0.fold(0, i + 1) + A[i]
    dp0.update(i + 1, v0)
    dp1.update(i + 1, v1)
    
print(max(dp0.fold(0, N + 1), dp1.fold(0, N + 1)))
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