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Single Number II
题目描述:
Given an array of integers, every element appears three times except for one. Find that single one.
Note:
Your algorithm should have a linear runtime complexity. Could you implement it without using extra memory?
解题方案:
该题目的一般方法是开辟一个空间为32的数组bitsum[32],然后遍历题目中给定的数组,将数组中每个整数的每一bit位给分出来,加到bitsum的对应位置。最后再遍历bitsum数组,同时求bitsum[i]%3,将结果做移位操作!下面是该题的代码:
1 class Solution { 2 public: 3 int singleNumber(int A[], int n) { 4 int bitsum[32] = {0}; 5 int result = 0; 6 for (int i = 0; i < n; ++i) { 7 for (int j = 0; j < 32; ++j) { 8 bitsum[j] += A[i]>>j & 1; 9 }10 }11 for (int i = 0; i < 32; ++i) {12 result |=bitsum[i] % 3 << i;13 }14 return result;15 }16 };
Single Number II
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