12. c.90 II

#include<bits/stdc++.h>

using namespace std;


#define Line cout << endl << "-------------------------------------------\n\n"
#define forn(i, n) for(int i = 0; i < int(n);i++)
const int INF = 1e9 + 13;
const int N = 1e5 + 13;


int main(){
    int n, t; cin >> n >> t;
    while(!t){
        cout << "enter another digit/n>";
        cin >> t;
    }
    vector<int> a(n);
    forn(i, n)
        cin >> a[i];
    vector<int>::iterator it;
    forn(i, a.size())
            if (a[i] == t)
            {
                it = a.begin() + i++;
                a.insert(it, 0);
            }
   forn(i, a.size())
        cout << a[i] << ' ';
}