29. Divide Two Integers

阿新 • • 發佈：2019-01-11

一開始選擇累加（偷懶）結果是超時，然後只好用Bit Operation,參考了一篇博文

class Solution {
public:
	int divide(int dividend, int divisor) {
		if (dividend == INT_MIN&&divisor == -1)return INT_MAX;
		long long m = abs((long long)dividend), n = abs((long long)divisor), res = 0;
		int sign = ((dividend < 0) ^ (divisor < 
 0)) ? -1 : 1;//同0異1
		while (m >= n) {
			long long t = n, p = 1;
			while (m >= (t << 1)) {
				t <<= 1;
				p <<= 1;
			}
			res += p;
			m -= t;
		}
		return sign == 1 ? res : -res;
	}
};

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