以一己之力将难度8变成了难度7

#include <iostream>
#include <stack>
#include <cmath>
#include <vector>
#include <string.h>
#include <queue>
#include <stdio.h>
#include <iomanip>
#include <cstdio>
#include <algorithm>
#define int long long
using namespace std;
const int N = 1e5 + 10;
const int INF = 0x3f3f3f3f;
int a[N];
signed main()
{
    int n;
    cin >> n;
    for(int i = 1; i <= n; i++)
    {
        cin >> a[i];
    }
    a[n + 1] = INF;
    a[0] = -INF;
    int x;
    bool flag = 0;
    cin >> x;
    for(int i = 1; i <= n; i++)
    {
        if(x > a[i - 1] && x <= a[i])
        {
            cout << x << " ";
            flag = 1;
        }
        cout << a[i] << " ";
    }
    if(flag == 0)
    {
        cout << x << endl;
    }
	return 0;
}