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- #include<stdio.h>
- int main()
- {
- int n;
- scanf("%d", &n);
- int a[n];
- int i, j;
- for(i = 0; i < n; i++) scanf("%d", &a[i]);
- for(i = 0; i < n; i++)
- {
- for(j = i+1; j < n; j++)
- {
- if(a[i] == a[j]) a[i] = -1;
- }
- }
- int c = 0;
- for(i = 0; i < n; i++)
- {
- if(a[i] != -1)
- {
- c++;
- }
- }
- printf("%d\n", c);
- for(i = 0; i < n; i++)
- {
- if(a[i] != -1)
- {
- printf("%d ", a[i]);
- }
- }
- printf("\n");
- }
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