归并排序: ^hG
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package org.rut.util.algorithm.support; qb^jcy
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import org.rut.util.algorithm.SortUtil; E5-f{Qc
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/** :6~DOvY
* @author treeroot ]2^tV.^S^
* @since 2006-2-2 'S_kD! BO
* @version 1.0 ttazY#
*/ !1i(6 ?~#4
public class MergeSort implements SortUtil.Sort{ :)!X%2_
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/* (non-Javadoc) G#V}9l8Q
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) AJ0qq
*/ q+A^JjzT
public void sort(int[] data) { ?vHow$
int[] temp=new int[data.length]; 4>q^W $
mergeSort(data,temp,0,data.length-1); PV_E3,RY
} q1 :Y]Rbe
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private void mergeSort(int[] data,int[] temp,int l,int r){ (~YFm"S
int mid=(l+r)/2; _{.=zv|3
if(l==r) return ; 5hNjJqu
mergeSort(data,temp,l,mid); 1J}i :i&
mergeSort(data,temp,mid+1,r); )_*<uSl
for(int i=l;i<=r;i++){ d2b L_
temp=data; +UzFHiGy#
} ]SNA2?q
int i1=l; ZTCzD8
int i2=mid+1; d3A= (/>D
for(int cur=l;cur<=r;cur++){ qT`sPEs;V
if(i1==mid+1) ]dZ8]I<$C
data[cur]=temp[i2++]; g[VVxp!C<
else if(i2>r) "qEi$a&]
data[cur]=temp[i1++]; 4@,d{qp~
else if(temp[i1] data[cur]=temp[i1++]; OBGA~E;%
else ;]ojfR=?%
data[cur]=temp[i2++]; Ka[@-XH
} Kjbz\~
} sE*A,z?
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改进后的归并排序: =bJj;bc'5
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package org.rut.util.algorithm.support; 5):2;h k
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import org.rut.util.algorithm.SortUtil; zd)2@jX=
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/** )9~1XiS,
* @author treeroot kV@*5yc?R
* @since 2006-2-2 Lod$&k@@
* @version 1.0 .@0 i,7S
*/ 1:-^*
public class ImprovedMergeSort implements SortUtil.Sort { __U;fH{c
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private static final int THRESHOLD = 10; TGnyN'P|
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/* M8Y\1#~
* (non-Javadoc) m5HP56a
* EjsAV F
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) jEQr{X7bEL
*/ x`'2oz=,F4
public void sort(int[] data) { IY@)
int[] temp=new int[data.length]; j%%l$i~
mergeSort(data,temp,0,data.length-1); 3L24|-GxH
} &5&C
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private void mergeSort(int[] data, int[] temp, int l, int r) { '}a[9v76
int i, j, k; }s;W{Q
int mid = (l + r) / 2; ># FO0R
if (l == r) 8l|v#^v
return; 7
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if ((mid - l) >= THRESHOLD) fMjn8.
mergeSort(data, temp, l, mid); S5eQHef
else zx7*Bnu0
insertSort(data, l, mid - l + 1); L@*0wx`fU
if ((r - mid) > THRESHOLD) b* 4[)Yg4
mergeSort(data, temp, mid + 1, r);
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else ,|?-\?I
insertSort(data, mid + 1, r - mid); 5.J$0wK'6
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for (i = l; i <= mid; i++) { ?>lvV+3^`
temp = data; u@SE)qg
} ajy.K'B*
for (j = 1; j <= r - mid; j++) { >SJ#
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temp[r - j + 1] = data[j + mid]; &(!Sy?tNe
} x{u7# s1|/
int a = temp[l]; pm<zw-
int b = temp[r]; {r2-^QHF
for (i = l, j = r, k = l; k <= r; k++) { YQ>P{I%J
if (a < b) { ;I'pC?!y
data[k] = temp[i++];
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a = temp; 7&G[mOx0
} else { bK `'zi
data[k] = temp[j--]; ]a|3"DP5
b = temp[j]; b&u o^G,
} <Sn5ME<*
} azMrY<
} } G$rr.G
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/** v'`9^3(-
* @param data 5q[0;`J
* @param l ehEXC
* @param i Fy-+? ~
*/ Y7R"~IA$
private void insertSort(int[] data, int start, int len) { |xaJv:96%
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1);
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} T:Dp+m!\{
} ]saf<?fzr
} mLM$dk3
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}