color:black;mso-font-kerning:0pt'>t a g</span><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>為</span><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>1</span><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>表示其他情形，那么在到達亞特蘭大后，狀態(tài)的三維數(shù)組將變?yōu)椋?/span></span><span lang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>0</span><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>，亞特蘭大，紐約），它對應(yīng)的最優(yōu)路徑是經(jīng)由芝加哥的那條路徑。<spanlang=EN-US><o:p></o:p></span></span></p><p class=MsoNormal align=left style='text-align:left;text-indent:20.0pt;mso-char-indent-count:2.0;mso-char-indent-size:10.0pt;mso-layout-grid-align:none;text-autospace:none'><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>當(dāng)最優(yōu)決策序列中包含最優(yōu)決策子序列時，可建立動態(tài)規(guī)劃遞歸方程（ </span><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>d y n a m i c -programming recurrenceequation</span><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>），它可以幫助我們高效地解決問題。<span lang=EN-US><o:p></o:p></span></span></p><p class=MsoNormal align=left style='text-align:left;text-indent:20.1pt;mso-char-indent-count:2.0;mso-char-indent-size:10.05pt;mso-layout-grid-align:none;text-autospace:none'><b><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>例<span lang=EN-US>3</span></span></b><b><spanlang=EN-US style='font-size:10.0pt;font-family:Arial;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>-4 [0/1</span></b><b><spanstyle='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>背包</span></b><b><span lang=EN-US style='font-size:10.0pt;font-family:Arial;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>]</span></b><spanlang=EN-US style='font-size:10.0pt;font-family:Arial;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'> </span><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>在例<spanlang=EN-US>3</span></span><span lang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'> - 2</span><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>的</span><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>0 / 1</span><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>背包問題中，最優(yōu)決策序列由最優(yōu)決策子序列組成。假設(shè)</span><i><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>f </span></i><span lang=EN-USstyle='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>(<i>i</i>,<i>y</i>) </span><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>表示例</span><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>1 5 - 2</span><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>中剩余容量為</span><i><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>y</span></i><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>，剩余物品為</span><i><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>i</span></i><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>，</span><i><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>i </span></i><span lang=EN-USstyle='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>+ 1</span><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>，<span lang=EN-US>.，</span></span><i><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>n </span></i><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>時的最優(yōu)解的值，即：和利用最優(yōu)序列由最優(yōu)子序列構(gòu)成的結(jié)論，可得到</span><i><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>f </span></i><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>的遞歸式。</span><i><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>f </span></i><span lang=EN-USstyle='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>( 1 ,<i>c</i>) </span><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>是初始時背包問題的最優(yōu)解。可使用（ </span><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>1 5 - 2</span><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>）式通過遞歸或迭代來求解</span><i><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>f </span></i><span lang=EN-USstyle='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>( 1 ,<i>c</i>)</span><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>。從</span><i><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>f </span></i><span lang=EN-USstyle='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>(<i>n</i>, * )</span><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>開始迭式， </span><i><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>f </span></i><span lang=EN-USstyle='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>(<i>n</i>, * )</span><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>由（</span><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>1 5 - 1</span><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>）式得出，然后由（ </span><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>1 5 - 2</span><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>）式遞歸計算</span><i><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>f </span></i><span lang=EN-USstyle='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>(<i>i</i>,*) ( <i>i</i>=<i>n</i>- 1</span><spanstyle='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>，</span><i><span lang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>n</span></i><span lang=EN-USstyle='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>- 2</span><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>，<span lang=EN-US>.， </span></span><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>2 )</span><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>，最后由（ </span><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>1 5 - 2</span><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>）式得出</span><i><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>f </span></i><span lang=EN-USstyle='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>( 1 ,<i>c</i>)</span><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>。<span lang=EN-US><o:p></o:p></span></span></p><p class=MsoNormal align=left style='text-align:left;text-indent:20.0pt;mso-char-indent-count:2.0;mso-char-indent-size:10.0pt;mso-layout-grid-align:none;text-autospace:none'><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>對于例</span><span lang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>1 5- 2</span><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>，若</span><span lang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>0</span><spanstyle='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>≤</span><i><span lang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>y</span></i><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>＜</span><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>1 0</span><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>，則</span><i><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>f </span></i><span lang=EN-USstyle='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>( 3 ,<i>y</i>) = 0</span><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>；若</span><i><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>y</span></i><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>≥</span><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>1 0</span><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>，</span><i><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>f </span></i><span lang=EN-USstyle='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>( 3 ,<i>y</i>) = 1 5</span><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>。利用遞歸式（</span><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>1 5 - 2</span><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>），可得</span><i><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>f </span></i><span lang=EN-USstyle='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>(2, <i>y</i>) = 0 ( 0</span><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>≤</span><i><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>y</span></i><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>＜</span><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>10 )</span><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>；</span><i><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>f</span></i><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>（</span><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>2</span><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>，</span><i><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>y</span></i><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>）</span><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>= 1 5</span><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>（</span><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>1 0</span><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>≤</span><i><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>y</span></i><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>＜</span><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>1 4</span><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>）；</span><i><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>f</span></i><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>（</span><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>2</span><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>，</span><i><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>y</span></i><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>）</span><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>= 1 8</span><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>（</span><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>1 4</span><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>≤</span><i><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>y</span></i><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>＜</span><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>2 4</span><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>）和</span><i><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>f</span></i><span style='font-size:10.0pt;font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>（</span><spanlang=EN-US style='font-size:10.0pt;mso-fareast-font-family:仿宋_GB2312;color:black;mso-font-kerning:0pt'>2</spa