两个整数相除

class Solution {
public:
    /**
     * @param dividend the dividend
     * @param divisor the divisor
     * @return the result
     */
    int divide(int dividend, int divisor) {
        // Write your code here
        bool resultGreatThanZero = true;
        if(dividend>0&&divisor<0||dividend<0&&divisor>0)
            resultGreatThanZero = false;
        long long ret = 0;
        long long d1 = abs((long long)dividend);
        long long d2 = abs((long long)divisor);
        while(d1>=d2)
        {
            long long temp = d2;
            long long cnt = 1;
            while(d1>=temp)
            {
                d1-=temp;
                ret+=cnt;
                cnt = cnt<<1;
                temp = temp<<1;
            }
        }
        if(!resultGreatThanZero)
            ret*=-1;
        if(ret<(long long)INT_MIN||ret>(long long)INT_MAX)
            return INT_MAX;
        return ret;
    }
};