[LeedCode OJ]#162 Find Peak Element

class Solution
{
public:
    int findPeakElement(vector<int>& a)
    {
        int len = a.size();
        for(int i = 1; i<len-1; i++)
        {
            if(a[i]>a[i-1]&&a[i]>a[i+1])
                return i;
        }
        if(a[0]>a[len-1])
            return 0;
        return len-1;
    }
};