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34 lines
819 B
C++
34 lines
819 B
C++
#define _CRT_SECURE_NO_WARNINGS
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#define _SILENCE_CXX17_C_HEADER_DEPRECATION_WARNING
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#include <bits/stdc++.h>
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using namespace std;
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const int N = 2e5 + 50;
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int adj[N], nxt[N], to[N], ecnt;
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inline void addEdge(int f, int t)
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{
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ecnt++;
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nxt[ecnt] = adj[f];
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adj[f] = ecnt;
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to[ecnt] = t;
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}
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int main()
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{
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int n, m;
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scanf("%d%d", &n, &m);
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for (int i = 0, x, y; i < m; i++)
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scanf("%d%d", &x, &y), addEdge(x, y), addEdge(y, x);
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set<int> vis, tov;
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tov.insert(1);
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while (vis.size() != n)
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{
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int cur = *tov.begin();
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tov.erase(tov.begin());
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vis.insert(cur);
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printf("%d ", cur);
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for (int e = adj[cur]; e; e = nxt[e])
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if (vis.count(to[e]) == 0)
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tov.insert(to[e]);
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}
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return 0;
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}
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