感谢snake大佬指点，时隔多日总算通过

#include<stdio.h>
#include<stdlib.h>
typedef struct {
	int num;
	int repeat;//标记是否重复
}number;
void swap(number* a, number* b) {
		number temp = *a;
		*a = *b;
		*b = temp;
}
void BubbleSortUp(number* array, int length)//排序
{
	for (int i = 0; i < length - 1; i++) {
		for (int j = i + 1; j < length; j++) {
			if (array[i].num > array[j].num) {
				swap(&array[i], &array[j]);
			}
		}
	}
}

int main() {
	int n;
	scanf("%d", &n);
	int length = n;//记录长度
	int x,index;
	number* data = (number*)malloc(sizeof(number) * n);

	for (int i = 0; i < n; i++) {
		scanf("%d", &x);
		if (i == 0) {//首个数据不需要对比
			data[i].num = x;
			data[i].repeat = 0;
			continue;
		}
		
		for (int j = 0; j < i; j++) {//重复数据检测
			index = 0;//设置一个标记来判断是否存储
			if (x == data[j].num) {//有重复的数据修改数组长度和重复标记
				length--;
				data[j].repeat = 1;
				index = 1;
				break;
			}
		}
		if (index) 
			conti...