boran

def solution(a)
	
	lpeak = []
	sqrt_c = ( a.length ** 0.5 ).ceil
	fcnt = [0] * ( sqrt_c + 1)
	f_pt = 1
	(1...a.length-1).each { |i|

		if a[i-1] < a[i] && a[i] > a[i+1] 
			

			(f_pt..sqrt_c).each { |j|

				
				if lpeak[j] == nil || i - lpeak[j] >= j
					
					fcnt[j] += 1 
					lpeak[j] = i 

				end 
			}	

			f_pt += 1 if fcnt[f_pt] >= f_pt

		end
	}
	return fcnt.max
end