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- #include<stdio.h>
- int main()
- {
- int t;
- scanf("%d", &t);
- while(t--)
- {
- int n, i, idx;
- scanf("%d", &n);
- int a[n];
- for(i = 0; i < n; i++) scanf("%d", &a[i]);
- if(a[n - 2] != a[n - 1] && a[0] == a[n - 2])
- {
- idx = n;
- }
- else
- {
- for(i = 0; i < n; i++)
- {
- if(a[i] != a[i+1])
- {
- if(a[i+1] != a[i+2] && a[i] == a[i+2])
- {
- idx = i + 2;
- break;
- }
- else
- {
- idx = i + 1;
- break;
- }
- }
- }
- }
- printf("%d\n", idx);
- }
- }
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