eeee. In the fourth case we cannot reach the goal regardless of where we introduce the symlink.</div><br />
<div><br />
<div>1&lt;=K,S&lt;=1 000 000</div><br />
<div>N,M&lt;=3000</div><br />
<div>求译文!请发至lydsy2012@163.com</div><br />
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