熟悉地形

<p><!--[if gte mso 9]><xml><w:WordDocument><w:BrowserLevel>MicrosoftInternetExplorer4</w:BrowserLevel><w:DisplayHorizontalDrawingGridEvery>0</w:DisplayHorizontalDrawingGridEvery><w:DisplayVerticalDrawingGridEvery>2</w:DisplayVerticalDrawingGridEvery><w:DocumentKind>DocumentNotSpecified</w:DocumentKind><w:DrawingGridVerticalSpacing>7.8</w:DrawingGridVerticalSpacing><w:View>Normal</w:View><w:Compatibility></w:Compatibility><w:Zoom>0</w:Zoom></w:WordDocument></xml><![endif]--></p> <p style="text-indent: 21pt; margin-bottom: 0pt; margin-top: 0pt; text-align: left;" class="p0"><span style="font-size: 10.5pt; font-family: '宋体';">刚入学的时候总喜欢瞎逛以熟悉地形，当然也适用于网游<font face="Times New Roman">-_-</font></span></p> <p style="text-indent: 21pt; margin-bottom: 0pt; margin-top: 0pt; text-align: left;" class="p0"><span style="font-size: 10.5pt; font-family: '宋体';">话说有items人在<font face="Times New Roman">10^9*10^9</font><font face="宋体">的地方乱走，当然他希望不重复经过相同的位置，给出他的初始位置和走</font><font face="Times New Roman">m</font><font face="宋体">步的指令，问是否有存在某items位置被他走过两次（在初始位置但还没执行指令也认为初始位置被走过，且一步为一items单位长度）</font></span></p>

<p><!--[if gte mso 9]><xml><w:WordDocument><w:BrowserLevel>MicrosoftInternetExplorer4</w:BrowserLevel><w:DisplayHorizontalDrawingGridEvery>0</w:DisplayHorizontalDrawingGridEvery><w:DisplayVerticalDrawingGridEvery>2</w:DisplayVerticalDrawingGridEvery><w:DocumentKind>DocumentNotSpecified</w:DocumentKind><w:DrawingGridVerticalSpacing>7.8</w:DrawingGridVerticalSpacing><w:View>Normal</w:View><w:Compatibility></w:Compatibility><w:Zoom>0</w:Zoom></w:WordDocument></xml><![endif]--></p> <p style="text-indent: 21pt; margin-bottom: 0pt; margin-top: 0pt; text-align: left;" class="p0"><span style="font-size: 10.5pt; font-family: '宋体';">Page 一行输入两items整数，<font face="Times New Roman">-10^9&lt;=x</font><font face="宋体">，</font><font face="Times New Roman">y&lt;=10^9</font><font face="宋体">，表示初始位置，Page 二行输入一items数</font><font face="Times New Roman">m</font><font face="宋体">，表示</font><font face="Times New Roman">m</font><font face="宋体">步指令，</font><font face="Times New Roman">m&lt;=50</font><font face="宋体">。Page 三行输入一串指令</font><font face="Times New Roman">(m</font><font face="宋体">items</font><font face="Times New Roman">)</font><font face="宋体">，指令只有</font><font face="Times New Roman">4</font><font face="宋体">种：</font><font face="Times New Roman">UDLR</font><font face="宋体">，</font><font face="Times New Roman">U</font><font face="宋体">表示向上走，</font><font face="Times New Roman">D</font><font face="宋体">表示向下走，</font><font face="Times New Roman">L</font><font face="宋体">表示向左走，</font><font face="Times New Roman">R</font><font face="宋体">表示向右走。</font></span></p>

<p><!--[if gte mso 9]><xml><w:WordDocument><w:BrowserLevel>MicrosoftInternetExplorer4</w:BrowserLevel><w:DisplayHorizontalDrawingGridEvery>0</w:DisplayHorizontalDrawingGridEvery><w:DisplayVerticalDrawingGridEvery>2</w:DisplayVerticalDrawingGridEvery><w:DocumentKind>DocumentNotSpecified</w:DocumentKind><w:DrawingGridVerticalSpacing>7.8</w:DrawingGridVerticalSpacing><w:View>Normal</w:View><w:Compatibility></w:Compatibility><w:Zoom>0</w:Zoom></w:WordDocument></xml><![endif]--><span style="font-size: 10.5pt; font-family: '宋体';">每items测试数据一行，如果存在重复走过的格子输出<font face="Times New Roman">Yes</font><font face="宋体">，否则输出</font><font face="Times New Roman">No</font><font face="宋体">。</font></span></p>