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- /*Input: 8
- 1 8 4 6 2 9 3 9
- Output: 81*/
- #include<stdio.h>
- int main()
- {
- long long n, i;
- scanf("%lld", &n);
- long long a[n];
- for(i = 0; i < n; i++) scanf("%lld", &a[i]);
- if(n == 1)
- {
- printf("%lld\n", a[0]);
- return 0;
- }
- if(n == 2)
- {
- printf("%lld\n", a[0] * a[1]);
- return 0;
- }
- long long max = a[0], max_idx;
- for(i = 1; i < n; i++)
- {
- if(max < a[i])
- {
- max = a[i];
- max_idx = i;
- }
- }
- //printf("%lld\n", max);
- long long max1 = a[0];
- for(i = 1; i < n; i++)
- {
- if(max_idx != i && max1 < a[i])
- {
- max1 = a[i];
- }
- }
- //printf("%lld\n", max1);
- printf("%lld\n", max * max1);
- }
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