题解 | #ZOJ#

#include<iostream>
#include<stdio.h>
#include<cstring>
#include<map>
using namespace std;

int main() {
    string s;
    while (cin >> s) {
        map<char, int>m;
        m['Z'] = m['O'] = m['J'];
        //统计字频
        for(int i = 0; i < s.length(); i++)
        {
            m[s[i]]++;
        }

        //按照ZOJ顺序输出
        while(m['Z'] > 0 || m['O'] > 0 || m['J'] > 0)
        {
            if(m['Z'] > 0)
                cout << 'Z';
                m['Z'] --;//一定要更新字频
            if(m['O'] > 0)
                cout << 'O';
                m['O'] --;
            if(m['J'] > 0)
                cout << 'J';
                m['J'] --;
        }
    }
    return 0;
}