{"id":328,"date":"2016-08-27T01:28:07","date_gmt":"2016-08-26T17:28:07","guid":{"rendered":"http:\/\/www.bookcard.net\/wordpress\/?p=328"},"modified":"2016-08-27T11:41:56","modified_gmt":"2016-08-27T03:41:56","slug":"algorithm_quicksort_while","status":"publish","type":"post","link":"https:\/\/www.bookcard.net\/wordpress\/algorithm_quicksort_while\/","title":{"rendered":"\u6392\u5e8f\u7b97\u6cd5-\u5feb\u901f\u6392\u5e8f(\u975e\u9012\u5f52)"},"content":{"rendered":"

\u6392\u5e8f\u7b97\u6cd5-\u5feb\u901f\u6392\u5e8f(\u975e\u9012\u5f52)<\/p>\n

1.\u9009\u5219\u6700\u53f3\u5219\u7684\u5143\u7d20\u4f5c\u4e3a\u5212\u5206\u5143\u7d20v,\u7136\u540e\u4ece\u5de6\u5219\u626b\u63cf\u5c0f\u4e8ev\u7684\u5143\u7d20,\u7136\u540e\u4ece\u53f3\u5219\u626b\u63cf\u5927\u4e8ev\u7684\u5143\u7d20.
\n\u4ea4\u6362\u90a3\u4e9b\u4f7f\u626b\u63cf\u505c\u6b62\u7684\u5143\u7d20.
\n2.\u91cd\u590d\u8fdb\u884c\u8fd9\u6837\u7684\u8fc7\u7a0b\u76f4\u5230\u4e24\u4e2a\u6307\u9488\u76f8\u9047.
\n3.\u7136\u540e\u5206\u522b\u5bf9\u5de6\u53f3\u4e24\u6b65\u5206\u8fdb\u884c\u9012\u5f52\u5904\u7406.\u6700\u7ec8\u5f97\u5230\u4e00\u4e2a\u6392\u597d\u5e8f\u7684\u6570\u7ec4.<\/p>\n

\/\/ \u5168\u5c40\u6570\u636e
\nint stack[128];\/\/ \u5806\u6808
\nint ps;\/\/ \u5806\u6808\u6307\u9488
\n\/\/\u521d\u59cb\u5316\u5806\u6808
\nvoid init()
\n{
\nps = 0;
\n}<\/p>\n

\/\/\u5806\u6808\u662f\u5426\u4e3a\u7a7a
\nint IsEmpty()
\n{
\nif(ps == 0)
\nreturn 1;
\nelse
\nreturn 0;
\n}<\/p>\n

\/\/ \u538b\u5165
\nvoid push(int v)
\n{
\nstack[ps]=v;
\n++ps;\/\/ \u6307\u9488\u52a0\u4e00
\n}<\/p>\n

\/\/ \u5f39\u51fa
\nint pop()
\n{
\nif(ps == 0)
\nreturn = 0;
\n–ps;\/\/ \u6307\u9488\u51cf\u4e00
\nreturn stack[ps];
\n}<\/p>\n

\u4e0b\u9762\u7ed9\u51faC\u4ee3\u7801\u7684\u5b9e\u73b0.
\n\/\/\u5feb\u901f\u6392\u5e8f(\u975e\u9012\u5f52)
\n\/\/a:\u6570\u7ec4
\n\/\/l:\u6570\u7ec4\u7684\u5de6\u5219\u7d22\u5f15
\n\/\/r:\u6570\u7ec4\u7684\u53f3\u5219\u7d22\u5f15
\nvoid quicksort(int a[],int l,int r)
\n{
\ninit();
\npush(l);
\npush(r);<\/p>\n

while(IsEmpty())
\n{
\nl=pop();
\nr=pop();
\nif(r<=l)
\ncontinue;
\ni=partition(a,l,r);
\nif(i-l < r-i)
\n{
\npush(l);
\npush(i-1);<\/p>\n

push(i+1);
\npush(r);
\n}
\nelse
\n{
\npush(i+1);
\npush(r);<\/p>\n

push(l);
\npush(i-1);
\n}
\n}<\/p>\n

}<\/p>\n

\/\/ \u5212\u5206\u7b97\u6cd5
\n\/\/a:\u6570\u7ec4
\n\/\/l:\u6570\u7ec4\u7684\u5de6\u5219\u7d22\u5f15
\n\/\/r:\u6570\u7ec4\u7684\u53f3\u5219\u7d22\u5f15
\nint partition(int a[],int l,int r)
\n{
\nint i,j,v,t;
\ni = l;
\nj = r;
\nv = a[j];\/\/\u9009\u5219\u6700\u53f3\u5219\u7684\u5143\u7d20\u4f5c\u4e3a\u5212\u5206\u5143\u7d20v
\nwhile(true)
\n{
\nwhile(a[i]<v)
\n++i;\/\/ i\u7684\u5de6\u5219\u5c0f\u4e0ev<\/p>\n

while(v<a[j])
\n{
\n++j;\/\/ j\u7684\u53f3\u5219\u5927\u4e0ev
\nif(j==l)
\nbreak;\/\/ \u8df3\u51fa
\n}<\/p>\n

if(i>=j)
\nbreak;\/\/ \u4e24\u4e2a\u6307\u9488\u76f8\u9047\u8df3\u51fa\u626b\u63cf.<\/p>\n

\/\/ \u4ea4\u6362i,j,\u4ea4\u6362\u90a3\u4e9b\u4f7f\u626b\u63cf\u505c\u6b62\u7684\u5143\u7d20.
\nt=a[i];
\na[i]=a[j];
\na[j]=t;
\n}<\/p>\n

\/\/ \u4ea4\u6362i,r,\u4fdd\u8bc1v\u7684\u5de6\u5219\u5c0f\u4e8e\u4e8e\u5b83,v\u7684\u53f3\u5219\u5927\u4e8e\u5b83.
\nt=a[i];
\na[i]=a[r];
\na[r]=t;<\/p>\n

return i;
\n}<\/p>\n