注意第 $2$ 行。

（备注：longer 是我们隔壁班班主任）

#include <bits/stdc++.h>
#define ll longer longer
#define _for(i, a, b)  for (int i = (a); i <= (b); i ++ )
#define _all(i, a, b)  for (int i = (a); i >= (b); i -- )
using namespace std;
const int N = 2005;
int n, m, bel[N];
int main() {
	ios :: sync_with_stdio(false), cin.tie(0), cout.tie(0);
	cin >> n >> m;
	_for (i, 1, n)  bel[i] = i;
	_for (i, 1, m) {
		int x, y;
		cin >> x >> y;
		bel[x] = y;
	}
	_for (i, 1, n)  cout << bel[i] << endl;
	return 0;
}