我是这么写的 import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner in = new Scanner(System.in); while (in.hasNextInt()) {//注意while处理多个case int n = in.nextInt(); int[] num=new int[n]; int count=0; for(int i=0;i<n;i++){ num[i]=in.nextInt(); } int front=0; int end=n-1; while(front<end){ int sum=num[end]-num[front]; while(sum!=0&&end-front!=1){ if(sum>0){ sum=sum-num[++front]; count++; } else{ sum=sum+num[--end]; count++; } } if(sum!=0&&end-front==1){ count++; } front++; end--; } System.out.println(count); } } }