test.cpp

#include <bits/stdc++.h>
using namespace std;

#define all(x) begin(x), end(x)
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ll> vll;
typedef vector<vll> vvll;
typedef vector<bool> vb;
typedef vector<vb> vvb;

int main() {
    cin.tie(0)->sync_with_stdio(0);

    const int N = 100;
    vi nums;
    for (int i = 0; i < N; i++) {
        nums.push_back(i);
        int pos = i / 2;
        int val = *nums.begin();
        nums.erase(nums.begin());
        nums.insert(nums.begin() + pos, val);

        for (auto x : nums) {
            cout << x << " ";
        }
        cout << endl;
    }
}