C++ 代码
#include <cstdio>
#include <cstring>
#include <iostream>
#include <algorithm>
using namespace std;
int usd[1000000];
int main()
{
int n;
cin>>n;
int maxx = -1 , minn = 100001;
for (int i = 1;i <= n; i++)
{
int x;
while(cin>>x)
{
maxx = max(maxx,x);
minn = min(minn,x);
usd[x]++;
}
}
int f1,f2;
for(int i = minn;i <= maxx;i++)
{
if(usd[i] == 0) f1 = i;
if(usd[i] == 2) f2 = i;
}
cout<<f1<<' '<<f2<<endl;
return 0;
}