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| package main
import (
"bufio"
"fmt"
"os"
"strconv"
"strings"
)
var s []int
func s_push(x int) {
s = append(s, x)
}
func s_pop() {
if s == nil {
fmt.Printf("%d\n", -1)
} else if len(s) == 1 {
top := s[0]
fmt.Printf("%d\n", top)
s = nil
} else {
l := len(s)
top := s[l-1]
fmt.Printf("%d\n", top)
s = s[:l-1]
}
}
func s_size() {
l := len(s)
fmt.Printf("%d\n", l)
}
func s_empty() {
if s == nil {
fmt.Printf("%d\n", 1)
} else {
fmt.Printf("%d\n", 0)
}
}
func s_top() {
if s == nil {
fmt.Printf("%d\n", -1)
} else {
l := len(s)
top := s[l-1]
fmt.Printf("%d\n", top)
}
}
func main() {
var n int
inputReader := bufio.NewReader(os.Stdin)
fmt.Scanf("%d", &n)
for i := 0; i < n+1; i++ {
input, _ := inputReader.ReadString('\n')
order := strings.Split(input, " ")
action := strings.TrimSpace(order[0])
if len(order) == 2 {
n := strings.TrimSpace(order[1])
num, _ := strconv.Atoi(n)
s_push(num)
} else {
switch action {
case "pop":
s_pop()
case "size":
s_size()
case "empty":
s_empty()
case "top":
s_top()
}
}
}
}
|
