python/TangDou/AcWing/TiaoZhanChengXuSheJi/POJ3617.cpp

#include <iostream>
using namespace std;
const int N = 2010;
char s[N];

int main() {
    int n;
    cin >> n;
    for (int i = 0; i < n; i++) cin >> s[i];

    int a = 0, b = n - 1, idx = 0;

    while (a <= b) {
        bool left = false;
        for (int i = 0; a + i <= b; i++) { // 若首位相等则比较下一个
            if (s[a + i] < s[b - i]) {
                left = true;
                break;
            }
            if (s[a + i] > s[b - i]) {
                left = false;
                break;
            }
        }
        if (left)
            putchar(s[a++]);
        else
            putchar(s[b--]);
        idx++;

        if (idx == 80) {
            idx = 0;
            puts("");
        }
    }
    return 0;
}