gnuykob_sw

www.acmicpc.net/problem/10828

문제

코드

#include <stdio.h>
#include <string.h>

int stack[100001];
int count = 0;

void push(int x);
void pop();
void size();
void empty();
void top();

int main() {
    int n, x;
    char order[6];

    scanf("%d", &n);

    for (int i = 0; i < n; i++) {
        scanf("%s", &order);

        if (!strcmp(order, "push")) {
            scanf("%d", &x);
            push(x);
        }

        else if (!strcmp(order, "pop")) pop();
        else if (!strcmp(order, "size")) size();
        else if (!strcmp(order, "empty")) empty();
        else if (!strcmp(order, "top")) top();
        else break;
    }
    return 0;
}

void push(int x) {
    stack[count] = x;
    count++;
}

void pop() {
    if (count != 0) {
        count--;
        printf("%d\n", stack[count]);
        stack[count] = 0;
    }
    else printf("%d\n", -1);
}

void size() {
    printf("%d\n", count);
}

void empty() {
    if (count == 0) printf("%d\n", 1);
    else printf("%d\n", 0);
}

void top() {
    if (count > 0) 
        printf("%d\n", stack[count-1]);
    else printf("%d\n", -1);
}