题解 | #【模板】栈#

#include <stdio.h>
#include<string.h>
int main() {
    int n;
    int count = 0;
    char operand[5];
    int num;
    int arr[100000];
    scanf("%d", &n);
    for (size_t i = 0; i < n; i++)
    {

        scanf("%s", operand);
        if (!strcmp(operand, "push"))
        {

            scanf("%d", &num);
            arr[count++] = num;
        }
        else
        {
            if (count == 0)
                printf("error\n");
            else if (!strcmp(operand, "pop"))
                printf("%d\n", arr[--count]);
            else if (!strcmp(operand, "top"))
                printf("%d\n", arr[count - 1]);
        }
    }
    return 0;
}