在一个有序数组中,找＞=某个数最左侧的位置

package com.harrison.Class01;

import java.util.Arrays;

public class Code05_BSNearLeft {
    
    
	public static int nearestIndex(int[] arr,int value) {
    
    
		int l=0;
		int r=arr.length-1;
		int mid=0;
		int index=-1;
		while(l<=r) {
    
    
			mid=l+((r-l)>>1);
			if(arr[mid]>=value) {
    
    
				r=mid-1;
				index=mid;
			}else {
    
    
				l=mid+1;
			}
		}
		return index;
	}
	
	//从左往右
	public static int test(int[] arr,int value) {
    
    
		for(int i=0; i<arr.length; i++) {
    
    
			if(arr[i]>=value) {
    
    
				return i;
			}
		}
		return -1;
	}
	
	public static int[] generateRandomArray(int maxSize,int maxValue) {
    
    
		int[] arr=new int[(int)(Math.random()*(maxSize+1))];
		for(int i=0; i<arr.length; i++) {
    
    
			arr[i]=(int)(Math.random()*(maxValue+1))-(int)(Math.random()*maxValue);
		}
		return arr;
	}
	
	public static void printArray(int[] arr) {
    
    
		if(arr==null) {
    
    
			return ;
		}
		for(int i=0; i<arr.length; i++) {
    
    
			System.out.print(arr[i]+" ");
		}
		System.out.println();
	}
	
	public static void main(String[] args) {
    
    
		int testTimes=1000000;
		int maxSize=100;
		int maxValue=100;
		boolean succeed=true;
		for(int i=0; i<testTimes; i++) {
    
    
			int value=(int)(Math.random()*(maxValue+1))-(int)(Math.random()*maxValue);
			int[] arr=generateRandomArray(maxSize, maxValue);
			Arrays.sort(arr);
			if(nearestIndex(arr, value)!=test(arr, value)) {
    
    
				printArray(arr);
				System.out.println(value);
				System.out.println(nearestIndex(arr, value));
				System.out.println(test(arr, value));
				succeed=false;
				break;
			}
		}
		System.out.println(succeed?"Nice":"Fucking fucked");
	}
}