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Create 180021100734 #1

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33 changes: 33 additions & 0 deletions 二分搜索/180021100734
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Original file line number Diff line number Diff line change
@@ -0,0 +1,33 @@

public class Binarysearch {
public static void main(String[] args){
java.util.Scanner scan = new java.util.Scanner(System.in);
int x = scan.nextInt();
int b[]={1,3,5,7,9,11,13,15,17,19};
if(search(b,x)==-1)
System.out.println("未找到x");
else
System.out.println("x在数组的第"+search(b,x)+"位");

}

static int search(int b[],int x){
int n=b.length;
int left=0;
int right=n;
while(left<=right){
int middle=(left+right)/2;
if(x==b[middle])
return middle+1;
if(x>b[middle])
left=middle+1;
else
right=middle-1;
}
return -1;
}
}