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- #include <stdio.h>
- int main(){
- int k,n,a[101000],benar;
- scanf("%d %d",&n,&k);
- for (int i=1;i<=n;i++){
- scanf("%d",&a[i]);
- }
- for (int j=k;j<=n;j++){
- if(a[j]!=a[k])
- {printf("-1\n");return 0;
- }
- }
- for (int j=k;j>0;j--){
- if(a[j]!=a[k])
- printf("%d\n",j);return 0;
- }
- getchar();getchar();
- return 0;
- }
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