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50 lines
932 B
50 lines
932 B
2 years ago
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#include <bits/stdc++.h>
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using namespace std;
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const int N = 520;
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int g[N][N]; // 路径
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int in[N]; // 入度
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int ans[N];
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int n, m;
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/*
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4 3
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1 2
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2 3
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4 3
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1 2 4 3
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*/
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void toposort() {
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for (int i = 1; i <= n; i++) {
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int k = 1;
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while (in[k] != 0) k++;
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ans[i] = k;
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in[k] = -1;
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for (int j = 1; j <= n; j++) {
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if (g[k][j])
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in[j]--;
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}
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}
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}
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void init() {
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memset(in, 0, sizeof in);
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memset(ans, 0, sizeof ans);
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memset(g, 0, sizeof g);
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}
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int main() {
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while (~scanf("%d%d", &n, &m)) {
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init();
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while (m--) {
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int x, y;
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cin >> x >> y;
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if (g[x][y]) continue;
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g[x][y] = 1;
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in[y]++;
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}
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toposort();
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for (int i = 1; i < n; i++) cout << ans[i] << " ";
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cout << ans[n] << endl;
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}
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return 0;
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}
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