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- // tim dang song cua mang
- // Khai bao ham thu vien neu co
- #include<stdio.h>
- #include<conio.h>
- #define SIZE 50
- void nhap(int A[],int &n)
- {
- scanf("%d",&n);
- for(int i=0;i<n;i++)
- scanf("%d",&A[i]);
- }
- int tinh(int A[],int n)
- {
- int dem=-1;
- for(int i=1;i<n-1;i++)
- {
- if((A[i]<=A[i+1] && A[i-1]<=A[i]) || (A[i]>=A[i+1] && A[i-1]>=A[i]))
- return i;
- }
- return dem;
- }
- void main()
- {
- int A[SIZE],n;
- nhap(A,n);
- printf("%d",tinh(A,n));
- }
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