nt-content"><div style="position: relative; overflow: hidden;"><p>Byteotia城市有n个 towns m条双向roads. 每条 road 连接 两个不同的 towns ,没有重复的road. 所有towns连通。</p></div></div></div></div><div class="row"><div class="column"><h4 class="ui top attached block header">输入格式</h4><div class="ui bottom attached segment font-content"><div style="position: relative; overflow: hidden;"><div class=content><p>输入n&lt;=100000 m&lt;=500000及m条边</p></div></div></div></div>