1 #include <iostream>
2 #include <cstdio>
3 #include <cstring>
4 using namespace std;
5 int bit[32];/*储存n个数1 - 32位1的个数*/
6 int value, n;
7 int main()
8 {
9 while (~scanf("%d", &n)) {
10 memset(bit, 0, sizeof(bit));
11 for (int i = 0; i < n; ++i) {
12 scanf("%d", &value);
13 for (int i = 0; i < 32; ++i) {
14 bit[i] += (value >>i) & 1;
15 }
16 }
17 value = 0;
18 for (int i = 0; i < 32; ++i) {
19 value |= (bit[i] % 3) <<i;/*这里的%3是重点, 因为除了特殊的那个数,其他数1的个数必定是3的倍数,%3就是得到特殊数的第i位*/
20 }
21 printf("%d\n", value);
22 }
23 }
