//异或满足交换律和结合律
int singleNumber(int* nums, int numsSize){
int result = 0;
for (int i=0; i<numsSize; i++)
result ^= nums[i];
return result;
}
//异或满足交换律和结合律
int singleNumber(int* nums, int numsSize){
int result = 0;
for (int i=0; i<numsSize; i++)
result ^= nums[i];
return result;
}