Comments (2)
Assume we are dealing with an environment which could only store integers within the 32-bit signed integer range.
应该是不能用long定义变量的
from leetcode.
Really hate this Problem. SO many overflow inputs... After hours of commits, finally fixed the overflow inputs...
class Solution {
public:
int divide(int dividend, int divisor) {
if (dividend == INT_MIN && divisor == -1) return INT_MAX;
if (dividend == INT_MIN && divisor == INT_MIN) return 1;
if (dividend == INT_MIN && divisor == INT_MAX) return -1;
if (divisor == INT_MIN) return 0;
if (divisor == 0) return INT_MAX;
if (divisor == 1) return dividend;
int result = 0;
int count = 0;
if(dividend == INT_MIN){
dividend += abs(divisor);
count ++;
result += count;
}
int sign = ((dividend > 0 && divisor > 0)||(dividend < 0 && divisor < 0) )? 1 : -1;
int curDividend = abs(dividend);
int curDivisor = abs(divisor);
while (curDividend > 0) {
if(curDivisor <= INT_MAX /2 && ((curDivisor << 1) <= curDividend )){
//multiply divisor by 2 to be faster
curDivisor <<= 1;
curDividend -= curDivisor;
if(count >0) {
//also multiply count by 2
count <<= 1;
} else{
count = 2;
}
result += count;
} else {
curDividend -= abs(divisor);
if (curDividend >= 0) {
result ++;
}
}
}
return sign>0? result : -result;
}
};
from leetcode.
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from leetcode.