题解 | #小红的数轴移动#

import java.util.Scanner;

public class Main{

public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int n = sc.nextInt();
    
    int x = sc.nextInt();
    int []a = new int[100010];
    for(int i = 0;i < n;i++){
        a[i] = sc.nextInt();
    }
    long num = 0;//注意long
    int i = 0;
    while(x != 0 && i <= n){
        if(x > 0){
            x -= a[i];
            num += a[i];
        }else {
            x += a[i];
            num += a[i];
        }
        i++;
    }
    System.out.println(num);
}

}