import java.util.*;
import java.lang.*;
import java.io.*;
class Main {
public static int countPeaks(List<Double> values){
if(values.isEmpty())
return 0;
else{
int cpt=0;
for(int i=0; i<values.size(); i++){
if(i>=1 && i<values.size()-1){
if(values.get(i)>=values.get(i+1)+5 && values.get(i)>=values.get(i-1)+5 || (values.get(i)<=values.get(i+1)-5 && values.get(i)<=values.get(i-1)-5))
cpt++;
}
}
return cpt;
}
}
public static void main(String[] args) {
System.out.println(countPeaks(Arrays.asList(12.9,10.0,3.3,9.8)));
}
}
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