听谁说笔试

捡贝壳



 public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

        int variety = scanner.nextInt();
        int volume = scanner.nextInt();

        int[] nums = new int[variety];
        int[] vos = new int[variety];

        for (int i = 0; i < variety; i++) {

            nums[i] = scanner.nextInt();
            vos[i] = scanner.nextInt();
        }


        int currentv = 0;
        int count = 0;
        for (int j = 0; j < variety; j++) {

            for (int n = 0; n < nums[j]; n++) {
                int t = vos[j] + currentv;
                if (t > volume) break;
                currentv = t;
                count++;
            }
        }

        System.out.println(count);

    }
}