【滑动窗口】BISHI47 交换到最大

思路

求解代码

public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));

        int t = Integer.parseInt(br.readLine());

        while (t-- > 0) {

            String str = br.readLine();
            char[] s = str.toCharArray();
            int n = s.length;

            for (int i = 0; i < n; i++) {
                int max_val = s[i] - '0';
                int max_index = i;
                // 在窗口内寻找能产生最大价值的来源
                for (int j = i; j < Math.min(i + 10, n); j++) {
                    int cur_val = (s[j] - '0') - (j - i);
                    if (cur_val > max_val) {
                        max_val = cur_val;
                        max_index = j;
                    }
                }
                // 物理移动来源字符到当前位置i
                int tmp_index = max_index;
                while (tmp_index > i) {
                    char tmp_val = s[tmp_index];
                    s[tmp_index] = s[tmp_index - 1];
                    s[tmp_index - 1] = tmp_val;
                    tmp_index--;
                }
                // 将当前位置i的字符值更新为计算出的最优值
                s[i] = (char) (max_val + '0');
            }

            out.println(new String(s));
        }
        out.flush();
        out.close();
        br.close();
    }