2017-09-08 LeetCode_007 Reverse Integer
2017-09-08 16:34
302 查看
7. Reverse Integer
Reverse digits of an integer.
Example1: x = 123, return 321
Example2: x = -123, return -321
click to show spoilers.
Have you thought about this?
Here are some good questions to ask before coding. Bonus points for you if you have already thought through this!
If the integer's last digit is 0, what should the output be? ie, cases such as 10, 100.
Did you notice that the reversed integer might overflow? Assume the input is a 32-bit integer, then the reverse of 1000000003 overflows. How should you handle such cases?
For the purpose of this problem, assume that your function returns 0 when the reversed integer overflows.
Note:
The input is assumed to be a 32-bit signed integer. Your function should return 0 when the reversed integer overflows.
solution:
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Reverse digits of an integer.
Example1: x = 123, return 321
Example2: x = -123, return -321
click to show spoilers.
Have you thought about this?
Here are some good questions to ask before coding. Bonus points for you if you have already thought through this!
If the integer's last digit is 0, what should the output be? ie, cases such as 10, 100.
Did you notice that the reversed integer might overflow? Assume the input is a 32-bit integer, then the reverse of 1000000003 overflows. How should you handle such cases?
For the purpose of this problem, assume that your function returns 0 when the reversed integer overflows.
Note:
The input is assumed to be a 32-bit signed integer. Your function should return 0 when the reversed integer overflows.
solution:
#include <cstdlib>
2
class Solution {
3
public:
4
int reverse(int x) {
5
int ans = 0;
6
int f = (x == 0 ? 1 : x/abs(x));
7
while (x != 0) {
8
int temp = ans;
9
ans = ans*10+x%10;
10
if (ans != 0 && (ans/abs(ans) != f || (ans-x%10)/10 != temp)) return 0;
11
x /= 10;
12
}
13
return ans;
14
}
15
};
相关文章推荐
- leetcode-007-Reverse Integer
- LeetCode_reverse integer_007
- LeetCode 007: Reverse Integer
- 007 Reverse Integer [Leetcode]
- 007_LeetCode_7 Reverse Integer 题解
- leetcode Reverse Integer 007
- 【LeetCode-面试算法经典-Java实现】【007-Reverse Integer(翻转整数)】
- leetcode 7 Reverse Integer C++
- Leetcode|Reverse Integer(string转char*总结)
- LeetCode Reverse Integer
- LeetCode-7(Reverse Integer)
- Leetcode 7 Reverse Integer 反转数字
- LeetCode: Reverse Integer
- 【leetcode】7—reverse integer
- leetcode Reverse Integer(Java)
- leetcode题解||Reverse Integer 问题
- LeetCode题解:Reverse Integer (3种解法)
- LeetCode刷题(C++)——Reverse Integer(Easy)
- leetcode Reverse Integer
- Leetcode:Reverse Integer