#define _CRT_SECURE_NO_WARNINGS 1
//找到数组中，只出现一次的数字
#include<stdio.h>
#include<limits.h>
int main()
{
int arr[] = { 1,2,3,4,5,1,2,3,4};
int i = 0;
int sz = sizeof(arr) / sizeof(arr[0]);
for (i = 0; i < sz; i++)
{
int count = 0;
int j = 0;
for (j = 0; j < sz; j++)
{
if (arr[i] == arr[j]);
{
count++;
}

}

if (count == 1)
{
printf("找到单个数字：%d\n", arr[i]);
break;
}
}
return 0;
}