LeetCode 29. 两数相除 Divide Two Integers

给定两个整数，被除数 dividend 和除数 divisor。将两数相除，要求不使用乘法、除法和 mod 运算符。

返回被除数 dividend 除以除数 divisor 得到的商。

示例 1:

输入: dividend = 10, divisor = 3
输出: 3

示例 2:

输入: dividend = 7, divisor = -3
输出: -2

• public class Solution {
      public int divide(int dividend, int divisor) {
          if(divisor==0 || dividend==Integer.MIN_VALUE && divisor==-1){
              return Integer.MAX_VALUE;
          }
      
          int res = 0;
          if(dividend==Integer.MIN_VALUE){
              res = 1;
              dividend += Math.abs(divisor);
          }
          if(divisor==Integer.MIN_VALUE){
              return res;
          }
          boolean isNeg = ((dividend^divisor)>>>31==1)?true:false;
          dividend = Math.abs(dividend);
          divisor = Math.abs(divisor);
          int digit = 0;
          while(divisor<=(dividend>>1)){
              divisor <<= 1;
              digit++;
          }
          while(digit>=0){
              if(dividend>=divisor){
                  dividend -= divisor;
                  res += 1<>= 1;
              digit--;
          }
          return isNeg?-res:res;
      }
  }