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P2493.go
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P2493.go
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// Stack
// https://www.acmicpc.net/problem/2493
package main
import (
"bufio"
"container/list"
"fmt"
"os"
"strconv"
)
var sc *bufio.Scanner = bufio.NewScanner(os.Stdin)
var bw *bufio.Writer = bufio.NewWriter(os.Stdout)
type Tower struct {
height int
tag int
}
func Fn() {
stack := *NewStack()
N := scanInt()
for i := 0; i < N; i++ {
h := scanInt()
for !stack.Empty() {
if stack.Peek().(Tower).height < h {
stack.Pop()
} else {
fmt.Fprint(bw, stack.Peek().(Tower).tag, " ")
break
}
}
if stack.Empty() {
fmt.Fprint(bw, "0 ")
}
stack.Push(Tower{height: h, tag: i + 1})
}
}
func main() {
defer bw.Flush()
sc.Split(bufio.ScanWords)
Fn()
}
func scanInt() int {
sc.Scan()
v, _ := strconv.Atoi(sc.Text())
return v
}
/* Stack */
type Stack struct {
v *list.List
}
func NewStack() *Stack {
return &Stack{list.New()}
}
func (st *Stack) Push(v interface{}) {
st.v.PushBack(v)
}
func (st *Stack) Peek() interface{} {
top := st.v.Back()
if top == nil {
return nil
}
return st.v.Back().Value
}
func (st *Stack) Pop() interface{} {
top := st.v.Back()
if top == nil {
return nil
}
return st.v.Remove(top)
}
func (st *Stack) Empty() bool {
if st.v.Len() == 0 {
return true
} else {
return false
}
}