百度笔试-有大佬知道第三题和第一题咋做吗，第一题一直60%

public class Test1 { public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);  int n=sc.nextInt();  int m=sc.nextInt();  int[] arr=new int[2*n];
        List<Integer> list=new ArrayList<>(); int num=0;  for(int i=0;i<n*2;i++){
            arr[i]=sc.nextInt(); if (i%2==1){ if (arr[i-1]>m){
                    num+=arr[i];
                }else { for (int j=0;j<arr[i];j++){
                        list.add(arr[i-1]);
                    }
                }
            }
        }
        Collections.sort(list); int start=0;  int end=list.size()-1; while (end>=start){  int temp=list.get(end--);  if(temp>=m){
                num++;
            }else {
                temp+=list.get(start++); while (temp<m&&start<=end){
                    temp+=list.get(start++);
                }
                num++;
            }
        }
        System.out.println(num);
    }
}

public class Test2 { static int sum; public static void main(String[] args) {
        Scanner sc=new Scanner(System.in); int n=sc.nextInt(); int k=sc.nextInt(); sum=procee(n,k);
        System.out.println(sum);
    } private static int procee(int n, int k) { int small=getSum(n,k); if (small==-1){ return 1;
        }else { int big=small+k; sum=procee(small,k)+procee(big,k);
        } return sum;
    } private static int getSum(int n, int k) { int temp=n-k; if (temp<=1){ return -1;
       }else { if (temp%2==0){ return temp/2;
           }else { return -1;
           }
       }
    }
}