3719 - 2015校内选拔
时间限制 : 5 秒
内存限制 : 128 MB
<span style="font-size:24pt;"><span>•</span></span><span style="font-family:宋体;color:black;font-size:24pt;">今有</span><span style="font-family:Arial;color:black;font-size:24pt;">7</span><span style="font-family:宋体;color:black;font-size:24pt;">对数字:两个</span><span style="font-family:Arial;color:black;font-size:24pt;">1</span><span style="font-family:宋体;color:black;font-size:24pt;">,两个</span><span style="font-family:Arial;color:black;font-size:24pt;">2</span><span style="font-family:宋体;color:black;font-size:24pt;">,两个</span><span style="font-family:Arial;color:black;font-size:24pt;">3</span><span style="font-family:宋体;color:black;font-size:24pt;">,</span><span style="font-family:Arial;color:black;font-size:24pt;">...</span><span style="font-family:宋体;color:black;font-size:24pt;">两个</span><span style="font-family:Arial;color:black;font-size:24pt;">7</span><span style="font-family:宋体;color:black;font-size:24pt;">,把它们排成一行。</span>
<span style="font-size:24pt;"><span>•</span></span><span style="font-family:宋体;color:black;font-size:24pt;">要求,两个</span><span style="font-family:Arial;color:black;font-size:24pt;">1</span><span style="font-family:宋体;color:black;font-size:24pt;">间有</span><span style="font-family:Arial;color:black;font-size:24pt;">1</span><span style="font-family:宋体;color:black;font-size:24pt;">个其它数字,两个</span><span style="font-family:Arial;color:black;font-size:24pt;">2</span><span style="font-family:宋体;color:black;font-size:24pt;">间有</span><span style="font-family:Arial;color:black;font-size:24pt;">2</span><span style="font-family:宋体;color:black;font-size:24pt;">个其它数字,以此类推,两个</span><span style="font-family:Arial;color:black;font-size:24pt;">7</span><span style="font-family:宋体;color:black;font-size:24pt;">之间有</span><span style="font-family:Arial;color:black;font-size:24pt;">7</span><span style="font-family:宋体;color:black;font-size:24pt;">个其它数字。如下就是一个符合要求的排列:</span>
<span style="font-size:24pt;"><span>•</span></span><span style="font-family:Arial;color:black;font-size:24pt;">17126425374635</span>
<span style="font-size:24pt;"><span>•</span></span><span style="font-family:宋体;color:black;font-size:24pt;">当然,如果把它倒过来,也是符合要求的。</span>
<span style="font-size:24pt;"><span>•</span></span><span style="font-family:宋体;color:black;font-size:24pt;">请你找出另一种符合要求的排列法,并且这个排列法是以</span><span style="font-family:Arial;color:black;font-size:24pt;">74</span><span style="font-family:宋体;color:black;font-size:24pt;">开头的。</span>
<span style="font-size:24pt;"><span>•</span></span><span style="font-family:宋体;color:black;font-size:24pt;">注意:只填写这个</span><span style="font-family:Arial;color:black;font-size:24pt;">14</span><span style="font-family:宋体;color:black;font-size:24pt;">位的整数,不能填写任何多余的内容,比如说明注释等。</span>
<span style="font-size:24pt;"><span>•</span></span><span style="font-family:Arial;color:black;font-size:24pt;">74****4*7*****</span>
<span style="font-size:24pt;"><span>•</span></span><span style="font-family:Arial;color:black;font-size:24pt;">741*1*4*7*****</span><span style="font-family:Arial;color:black;font-size:24pt;"> </span>