movezerostoend.cpp

#include <bits/stdc++.h>

// Aarif Khan
// Codechef: https://www.codechef.com/users/aarifkhan_7
// Github: https://github.com/aarifkhan7

#define pi (3.141592653589)
#define MOD 1e9+7
#define ll long long int
#define all(x) x.begin(), x.end()
#define range(a, b) for(int i = a; i < b; i++)
#define range1(a, b) for(int j = a; j < b; j++)
#define inint(x) int x; cin >> x;
#define inarr(x, n) int arr[n]; range(0, n){cin >> x[i];}
#define inll(x) ll x; cin >> x;
#define instr(x) string x; cin >> x; 
#define printc(cont) for(auto x : cont) cout << x << ' '; cout << '\n';
#define printp(cont) for(auto x : cont) cout << x.first << ' ' << x.second << '\n';
#define fast ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);
#define pii pair<int,int>
#define vi vector<int>
#define pb push_back
#define mp make_pair

using namespace std;

void swap(int * a, int * b){
    int tmp = *a;
    *a = *b;
    *b = tmp;
}

int main()
{
    fast;
    inint(n); inarr(arr, n);
    int p1 = 0;
    int p2 = n-1;
    while(p1 < p2){
        while(arr[p1] != 0 && p1 < n){
            p1++;
        }
        while(arr[p2] == 0 && p2 > -1){
            p2--;
        }
        if(p1 < p2){
            swap(&arr[p1], &arr[p2]);
        }
    }
    printc(arr);
    return 0;
}