java 二分法详解几种实现方法

public static int biSearch(int []array,int a){
    int lo=0;
    int hi=array.length-1;
    int mid;
    while(lo<=hi){
      mid=(lo+hi)/2;
      if(array[mid]==a){
        return mid+1;
      }else if(array[mid]<a){
        lo=mid+1;
      }else{
        hi=mid-1;
      }
    }
    return -1;
  }

public static int sort(int []array,int a,int lo,int hi){
    if(lo<=hi){
      int mid=(lo+hi)/2;
      if(a==array[mid]){
        return mid+1;
      }
      else if(a>array[mid]){
        return sort(array,a,mid+1,hi);
      }else{
        return sort(array,a,lo,mid-1);
      }
    }
    return -1;
  }

public static int biSearch(int []array,int a){
    int n=array.length;
    int low=0;
    int hi=n-1;
    int mid=0;
    while(low<hi){
      mid=(low+hi)/2;
      if(array[mid]<a){
        low=mid+1;
      }else{
        hi=mid;
      }
    }
    if(array[low]!=a){
      return -1;
    }else{
      return low;
    }
  }

public static int biSearch(int []array,int a){
    int n=array.length;
    int low=0;
    int hi=n-1;
    int mid=0;
    while(low<hi){
      mid=(low+hi+1)/2;
      if(array[mid]<=a){
        low=mid;
      }else{
        hi=mid-1;
      }
    }
  
    if(array[low]!=a){
      return -1;
    }else{
      return hi;
    }
  }