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 /**
 * @author licheng
 * @function ¶þ·Ö²éÕÒ
 *
 * */
package com.licheng.array;
public class BinarySearch {
 /**
  * @author licheng
  * *¶þ·Ö²éÕÒÌØ¶¨ÕûÊýÔÚÕûÐÍÊý×éÖеÄλÖÃ(µÝ¹é)
  * @param dataSet(²éÕÒµÄÊý×é)
  * @param data(²éÕÒµÄÊý¾Ý)
  * @param beginIndex(¿ªÊ¼Ï±ê)
  * @param endIndex(½áÊøÏ±ê)
  * @return Êý¾ÝËùÔÚϱê
  *
  * */
 public int binarySearch(int [] dataSet, int data, int beginIndex, int endIndex) {
  //Èç¹û²éÕÒµÄÊýÒª±È¿ªÊ¼Ë÷ÒýµÄÊý¾ÝҪС»òÕßÊDZȽáÊøË÷ÒýµÄÊéÒª´ó£¬»òÕß¿ªÊ¼²éÕÒµÄË÷ÒýÖµ´óÓÚ½áÊøµÄË÷ÒýÖµ·µ»Ø-1ûÓв鵽
  int minIndex = (beginIndex + endIndex)/2;
  
  if (beginIndex > endIndex || data < dataSet[beginIndex] || data > dataSet[endIndex]) {
   return -1;
  }
  if (data > dataSet[minIndex]) {
   return binarySearch(dataSet, data, minIndex+1, endIndex);
  } else if (data < dataSet[minIndex]) {
   return binarySearch(dataSet, data, beginIndex, minIndex-1);
  } else {
   return minIndex;
  }
 }
 
 /**
     *¶þ·Ö²éÕÒÌØ¶¨ÕûÊýÔÚÕûÐÍÊý×éÖеÄλÖÃ(·ÇµÝ¹é)
     *@param dataset
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  }
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