Created
September 9, 2016 07:36
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Application of Binary Search - Circularly Rotated Array
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#include<bits/stdc++.h> | |
#define min(x,y) x<y?x:y | |
using namespace std; | |
int min_index(int a[],int n){ | |
int low=0,high=n-1; | |
while(low<=high){ | |
if(a[low]<=a[high]) | |
return low; | |
int mid = (low+high)/2; | |
int next=(mid+1)%n,prev=(mid+n-1)%n; | |
if(a[next]>=a[mid] && a[prev]>=a[mid]) | |
return mid; | |
else if(a[mid]<=a[high]) | |
high=mid-1; | |
else if(a[low]<=a[mid]) | |
low=mid+1; | |
} | |
return -1; | |
} | |
int main() | |
{ | |
int n,i=0; | |
cin>>n; | |
int a[n]; | |
while(i<n) | |
cin>>a[i++]; | |
int index = min_index(a,n); | |
int final_index =min(index,(n-index)%n); | |
cout<<final_index<<endl; | |
return 0; | |
} | |
/* | |
(1) | |
Input- | |
5 | |
5 1 2 3 4 | |
Output- | |
1 | |
(2) | |
Input- | |
5 | |
2 3 4 5 1 | |
Output- | |
2 | |
*/ |
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