Problem book allocation

#1

import java.util.*;
public class Main {
public static boolean isValid(int [] a, int stu, int ans ){
int s = 1, current_no_of_pages = 0;
for(int i = 0;i<a.length;i++){
if(current_no_of_pages<=ans){
current_no_of_pages = current_no_of_pages + a[i];
}else{
current_no_of_pages = a[i];
s++;
if(s>stu){
return false;
}
}
}
return true;
}
public static void main(String args[]) {
Scanner cin = new Scanner(System.in);
int t =cin.nextInt();
while(t>0){
int n = cin.nextInt(), s= cin.nextInt(), sum = 0,arr[] = new int[n];
for(int i = 0;i<arr.length;i++){
arr[i] = cin.nextInt();
sum = sum + arr[i];
}
int l = arr[arr.length-1], h = sum,ans=l;
while(l<=h){
int mid = (l+h)/2;
if(isValid(arr, s, mid)){
ans = mid;
h = mid - 1;
}else{
l = mid + 1;
}
}
System.out.println(sum-ans);
t–;
}
}
}====what’s the error in the code

#2

hi @AbhishekAhlawat1102
i have made modifications please have a look and if you have any doubt inbox me
import java.util.*;

public class temp {
public static boolean isValid(int[] a, int stu, int ans) {
int s = 1, current_no_of_pages = 0;
for (int i = 0; i < a.length; i++) {
if (current_no_of_pages +a[i]<= ans) {
current_no_of_pages = current_no_of_pages + a[i];
} else {
current_no_of_pages = a[i];
s++;
if (s > stu) {
return false;
}
}
}
return true;
}

public static void main(String args[]) {
	Scanner cin = new Scanner(System.in);
	int t = cin.nextInt();
	while (t > 0) {
		int n = cin.nextInt(), s = cin.nextInt(), sum = 0, arr[] = new int[n];
		for (int i = 0; i < arr.length; i++) {
			arr[i] = cin.nextInt();
			sum = sum + arr[i];
		}

		int l = arr[arr.length - 1];
		for(int v:arr){
			l=Math.max(l,v);
		}
		int h = sum, ans = l;
		while (l <= h) {
			int mid = (l + h) / 2;
			if (isValid(arr, s, mid)) {
				ans = mid;
				h = mid - 1;
			} else {
				l = mid + 1;
			}
		}
		System.out.println(ans);
		t--;
	}
}

}

#3

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