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goodland.java
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goodland.java
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import java.util.*;
public class Main{
public static void main(String params[]){
Scanner scanner = new Scanner(System.in);
int n=scanner.nextInt();
int k=scanner.nextInt();
int towerStatus[]=new int[n];
for (int i=0;i<n;i++)
towerStatus[i]=scanner.nextInt();
System.out.print(getElectricity(towerStatus,k));
}
private static int getElectricity(int[] towerStatus,int k) {
int result=0,temp=0;
int i=0,j;
while (i<towerStatus.length){
result=temp;
j=i+k-1;
if (i+k-1>=towerStatus.length)
j=towerStatus.length-1;
while (j>=i-k+1&&j>=0){
if (towerStatus[j]==1){
temp+=1;
i=j+k;
break;
}
j-=1;
}
if (result==temp)
return -1;
result=temp;
}
return result;
}
}