https://leetcode-cn.com/problems/binary-search/solution/er-fen-cha-zhao-by-leetcode/

package dataStructureAndAlgorithms.leetcode;

/**

• ${DESCRIPTION}

• @author yangningkai

• @create 2021-07-08 下午8:52
  **/
  public class BinarySearch {
  public static void main(String[] args) {
  int[] nums = {-1,0,3,5,9,12};
  int target = 2;
  int search = search(nums, target);
  System.out.println(search);

  }

  public static int search(int[] nums, int target) {
  int start = 0;
  int end = nums.length - 1;
  int flag = 0;
  while (start < end){
  flag = (start + end) / 2;
  if (nums[flag] == target) {
  return flag;
  } else if (nums[flag] < target) {
  start = flag + 1;
  }else {
  end = flag - 1;
  }
  }
  return -1;
  }
  }