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<title>●试题五</title>
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<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>●试题五<span
lang=EN-US><o:p></o:p></span></span></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>【答案】（</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>1</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>）</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>color</span><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>［</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>*ip</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>］（</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>2</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>）</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>adj</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>［</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>i</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>］［</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>j</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>］</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'> != 0 && color</span><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>［</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>j</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>］</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'> == c<o:p></o:p></span></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>（</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>3</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>）</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>i,k,adj,color</span><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>（</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>4</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>）</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>select </span><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>（</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>i,c+l,adj,color</span><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>）（</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>5</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>）</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>color</span><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>［</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>i</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>］</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>=c<o:p></o:p></span></p>
<p class=MsoNormal align=left style='text-align:left;mso-layout-grid-align:
none;text-autospace:none'><span style='mso-bidi-font-size:10.5pt;font-family:
宋体;mso-hansi-font-family:"Times New Roman"'>【解析】（</span><span lang=EN-US
style='mso-bidi-font-size:10.5pt'>1</span><span style='mso-bidi-font-size:10.5pt;
font-family:宋体;mso-hansi-font-family:"Times New Roman"'>）</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>Back</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>（）函数将</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>color</span><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>数组中紧邻</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>*ip</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>位置的，颜色值为</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>4</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>的一个连续区域的元素赋值为－</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>1</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>。（</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>2</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>）</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>colorOK</span><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>（）判断区域</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>i</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>对其之前的所有区域是否可以着色</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>c</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>。该句是检查</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>i</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>的相邻区域是否已有颜色为</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>c</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>的。（</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>3</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>）这是</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>colorOK</span><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>的参数列表。</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>Select</span><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>为区域</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>i</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>选择一种颜色，使用</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>colorok</span><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>函数对各种颜色（值为</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>c</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>～</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>4</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>的一种，不一定是所有颜色）分别进行检查。（</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>4</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>）</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>Coloring</span><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>（）函数寻找各种着色方案。它先从区域</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>0</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>开始，检查颜色，并着色（着色的顺序总是从小色值的颜色开始的）。当发现某一区域无法着色时，就使用</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>back</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>（）函数，将该区域之前的一个连贯区域进行洗色（对应</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>color</span><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>数组中赋值为－</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>1</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>）并回溯，并从回溯后的位置，重新开始进行颜色检查和赋色，但使用的色值比该位置洗色前的颜色值更大。若所有区域均已着色，则输出该着色方案。然后，使用</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>back</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>函数，重新进行着色。当所有颜色方案均已找到后，函数结束。（</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>5</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>）该句对区域</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>i</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>赋颜色</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>c</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>。</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>c</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>为之前</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>select</span><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>函数所选出的可以用的颜色。</span><span
style='font-size:8.5pt;font-family:"MS Sans Serif";mso-font-kerning:0pt;
mso-ansi-language:ZH-CN'><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></p>
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