LeetCode
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题意
Reverse digits of an integer.
Example1: x = 123, return 321
Example2: x = -123, return -321
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Note:
The input is assumed to be a 32-bit signed integer. Your function should return 0 when the reversed integer overflows.
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解法
注意溢出问题
实现
class Solution {public: int reverse(int x) { long long y = x; if(x < 0) y = y * -1;//注意用long long类型代替int long long reverse = 0; long long max = 2147483647; while(y != 0){ reverse = reverse * 10 + y % 10; if((x > 0 && reverse > max) || (x < 0 && reverse > max + 1)) return 0; y = y / 10; } if(x < 0) reverse = reverse * -1; return reverse; }};
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