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1422. 分割字符串的最大得分

给你一个由若干 0 和 1 组成的字符串 s ,请你计算并返回将该字符串分割成两个 非空 子字符串(即 子字符串和 子字符串)所能获得的最大得分。

「分割字符串的得分」为 子字符串中 0 的数量加上 子字符串中 1 的数量。

示例 1:

输入: s = "011101"
输出: 5
解释:
将字符串 s 划分为两个非空子字符串的可行方案有:
左子字符串 = "0" 且 右子字符串 = "11101",得分 = 1 + 4 = 5
左子字符串 = "01" 且 右子字符串 = "1101",得分 = 1 + 3 = 4
左子字符串 = "011" 且 右子字符串 = "101",得分 = 1 + 2 = 3
左子字符串 = "0111" 且 右子字符串 = "01",得分 = 1 + 1 = 2
左子字符串 = "01110" 且 右子字符串 = "1",得分 = 2 + 1 = 3

示例 2:

输入: s = "00111"
输出: 5
解释: 当 左子字符串 = "00" 且 右子字符串 = "111" 时,我们得到最大得分 = 2 + 3 = 5

示例 3:

输入: s = "1111"
输出: 3

提示:

  • 2 <= s.length <= 500
  • 字符串 s 仅由字符 '0''1' 组成。

题解 (Rust)

1. 题解

impl Solution {
    pub fn max_score(s: String) -> i32 {
        let s = s.into_bytes();
        let mut score_l = (b'1' - s[0]) as i32;
        let mut score_r = s[1..].iter().filter(|&&ch| ch == b'1').count() as i32;
        let mut ret = score_l + score_r;

        for i in 1..(s.len() - 1) {
            match s[i] {
                b'0' => score_l += 1,
                _ => score_r -= 1,
            }
            ret = ret.max(score_l + score_r);
        }

        ret
    }
}