36 lines
680 B
C++
36 lines
680 B
C++
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#include <bits/stdc++.h>
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using namespace std;
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const int N = 100010;
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int b[N], in[N];
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int main() {
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int n, m;
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cin >> n >> m;
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for (int i = 1; i <= n; i++) {
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int x, y;
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cin >> x >> y;
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in[y]++;
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b[x] = y;
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}
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int head = 0;
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for (int i = 1; i <= n; i++)
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if (in[i] == 0) {
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head = i;
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break;
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}
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for (int i = 1; i <= m; i++) {
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int x, y;
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cin >> x >> y;
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int t = b[x];
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b[x] = y;
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b[y] = t;
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}
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cout << head << endl;
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int x = b[head];
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while(x){
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cout << x << endl;
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x = b[x];
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}
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return 0;
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}
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