C++代码（stringstream）

#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
#include <string>
#include <sstream>

using namespace std;
typedef long long ll;
const int INF = 1e8;
const int N = 100005;
int cnt[N];
int n;

int main()
{
    int a;
    string s;
    int maxn = -INF, minn = INF;

    cin >> n;
    getline(cin, s);//读一个换行
    while(n--){
        getline(cin,s);//默认到换行符截止
        stringstream sin;//声明一个流的输入输出类
        sin << s;//将s的内容放入流
        while(sin >> a){//将流中的值放入a
            cnt[a]++;
            if(a > maxn) maxn = a;
            if(a < minn) minn = a;
        }
    }

    int x, y;
    for(int i = minn; i < maxn; i ++)
    {
        if(cnt[i] > 1) x = i;
        else if(cnt[i] == 0) y = i;
    }
    cout << y << " " << x << endl;
    return 0;
}