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【C】格子里的路

作者:姜南 / 发布于2012/2/21/ 633

<div><span class="preprocessor"><span id="1329783616338S" style="display: none;"></span>#include <stdio.h></span></div>
<div><span class="preprocessor">
</span></div>
<div></div>
<div><span class="datatypes">double</span><span> cnk(</span><span class="datatypes">double</span><span> n,</span><span class="datatypes">double</span><span> k){</span></div>
<div><span>    </span><span class="datatypes">double</span><span> i,c=1;</span></div>
<div><span>    </span><span class="keyword">if</span><span> (k>n-k) k=n-k;</span></div>
<div><span>    </span><span class="keyword">for</span><span>(i=n;i>n-k;i--) c*=i/(i-n+k);</span></div>
<div><span>    </span><span class="keyword">return</span><span> c;</span></div>
<div><span>}</span></div>
<div><span>
</span></div>
<div></div>
<div><span class="datatypes">int</span><span> main(){</span></div>
<div><span>    </span><span class="datatypes">double</span><span> n,k;</span></div>
<div><span>    </span><span class="keyword">while</span><span>(1){</span></div>
<div><span>        scanf(</span><span class="string">"%lf%lf"</span><span>,&n,&k);</span></div>
<div><span>        </span><span class="keyword">if</span><span>(n+k==0) </span><span class="keyword">break</span><span>;</span></div>
<div><span>        printf(</span><span class="string">"%.0lf/n"</span><span>,cnk(n+k,k));</span></div>
<div><span>    }</span></div>
<div><span>    </span><span class="keyword">return</span><span> 0;</span></div>
<div><span>}</span></div>
<div><span id="1329783616580E" style="display: none;"></span></div>

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