c语言代码解决问题

解题思路:

注意事项:

参考代码:

#include<stdio.h>

int main()

{

    int n, j = 0, sum = 0,i=0;

    scanf("%d", &n);

    while (n--)

    {

        int m, temp[100];

        scanf("%d", &m);

        if (m == 1)

        {

            scanf("%d", &temp[j]);

            j++;

            sum++;

        }

        else if (m == 2)

        {

            if (sum == 0)

            {

                printf("no\n");

                break;

            }

            else

            {

                printf("%d\n", temp[i]);

                i++;

                sum--;

            }

        }

        else if (m == 3)

        {

            printf("%d\n", sum);

        }

    }

    return 0;

}