提出 #64374143

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ソースコード 拡げる

#!/usr/bin/env python
import os
import sys
from io import BytesIO, IOBase


def main():
    n = int(input())
    a = list(map(int,input().split()))
    asum = [0]
    for elem in a:
        asum.append(asum[-1] ^ elem)
    
    ans = [None] * (n * n)
    def getans(i, j):
        if i > j:
            return 0
        return ans[i * n + j]
    def setans(i, j, x):
        ans[i * n + j] = x

    for l in range(1, n + 1):
        for i in range(n - l + 1):
            start = i
            end = i + l - 1
            curans = float("inf")
            if l % 2 == 1:
                for j in range(0, l, 2):
                    curans = min(getans(start, start + j - 1) + getans(start + j + 1, end), curans)
                setans(start, end, curans)
            else:
                for j in range(2, l, 2):
                    curans = min(getans(start, start + j - 1) + getans(start + j, end), curans)
                for j in range(1, l, 2):
                    curans = min(getans(start, start + j - 1) + getans(start + j, end) + 2 * (asum[end + 1] ^ asum[start]), curans)
                setans(start, end, curans)
    if n % 2 == 0:
        print(getans(0, n - 1))
    if n % 2 == 1:
        print(getans(0, n - 1) + asum[-1])

# region fastio

BUFSIZE = 8192


class FastIO(IOBase):
    newlines = 0

    def __init__(self, file):
        self._file = file
        self._fd = file.fileno()
        self.buffer = BytesIO()
        self.writable = "x" in file.mode or "r" not in file.mode
        self.write = self.buffer.write if self.writable else None

    def read(self):
        while True:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            if not b:
                break
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines = 0
        return self.buffer.read()

    def readline(self):
        while self.newlines == 0:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            self.newlines = b.count(b"\n") + (not b)
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines -= 1
        return self.buffer.readline()

    def flush(self):
        if self.writable:
            os.write(self._fd, self.buffer.getvalue())
            self.buffer.truncate(0), self.buffer.seek(0)


class IOWrapper(IOBase):
    def __init__(self, file):
        self.buffer = FastIO(file)
        self.flush = self.buffer.flush
        self.writable = self.buffer.writable
        self.write = lambda s: self.buffer.write(s.encode("ascii"))
        self.read = lambda: self.buffer.read().decode("ascii")
        self.readline = lambda: self.buffer.readline().decode("ascii")


sys.stdin, sys.stdout = IOWrapper(sys.stdin), IOWrapper(sys.stdout)
input = lambda: sys.stdin.readline().rstrip("\r\n")

# endregion

if __name__ == "__main__":
    main()

提出情報

ジャッジ結果