結果
| 問題 | No.1053 ゲーミング棒 |
| ユーザー |
 へのく
|
| 提出日時 | 2020-06-19 15:55:35 |
| 言語 | Rust (1.77.0 + proconio) |
| 結果 |
WA
|
| 実行時間 | - |
| コード長 | 24,643 bytes |
| コンパイル時間 | 13,946 ms |
| コンパイル使用メモリ | 395,208 KB |
| 実行使用メモリ | 9,560 KB |
| 最終ジャッジ日時 | 2024-07-03 13:26:47 |
| 合計ジャッジ時間 | 13,857 ms |
|
ジャッジサーバーID （参考情報） |
judge1 / judge3 |
（要ログイン）
テストケース
テストケース表示| 入力 | 結果 | 実行時間 実行使用メモリ |
|---|---|---|
| testcase_00 | AC | 1 ms
5,248 KB |
| testcase_01 | WA | - |
| testcase_02 | AC | 1 ms
5,376 KB |
| testcase_03 | AC | 1 ms
5,376 KB |
| testcase_04 | AC | 1 ms
5,376 KB |
| testcase_05 | WA | - |
| testcase_06 | WA | - |
| testcase_07 | WA | - |
| testcase_08 | AC | 0 ms
5,376 KB |
| testcase_09 | WA | - |
| testcase_10 | WA | - |
| testcase_11 | AC | 1 ms
5,376 KB |
| testcase_12 | AC | 1 ms
5,376 KB |
| testcase_13 | WA | - |
| testcase_14 | WA | - |
| testcase_15 | AC | 1 ms
5,376 KB |
| testcase_16 | WA | - |
| testcase_17 | AC | 1 ms
5,376 KB |
| testcase_18 | AC | 1 ms
5,376 KB |
| testcase_19 | WA | - |
| testcase_20 | WA | - |
| testcase_21 | WA | - |
| testcase_22 | AC | 1 ms
5,376 KB |
| testcase_23 | WA | - |
| testcase_24 | WA | - |
| testcase_25 | AC | 20 ms
9,560 KB |
| testcase_26 | AC | 14 ms
6,996 KB |
| testcase_27 | RE | - |
| testcase_28 | WA | - |
| testcase_29 | RE | - |
| testcase_30 | RE | - |
| testcase_31 | AC | 6 ms
5,376 KB |
| testcase_32 | AC | 6 ms
5,376 KB |
| testcase_33 | WA | - |
| testcase_34 | WA | - |
| testcase_35 | AC | 7 ms
5,376 KB |
| testcase_36 | AC | 7 ms
5,376 KB |
ソースコード
#![allow(unused_imports, non_snake_case)]
#![allow(dead_code)]
use crate::scanner::Scanner;
use crate::{data_structure::counter::Counter, misc::run_length_encoding};
fn main() {
let mut scan = Scanner::new();
let n = scan.read::<i32>();
let a = scan.readn::<i32>(n);
let r = run_length_encoding(&a).map(|t| t.1);
let cnt = r.to::<Counter<_>>();
if r[0] == *r.last_exn()
&& r.part(1..r.ilen() - 1)
.into_iter()
.collect::<Counter<_>>()
.values()
.all(|x| *x == 1)
{
println!("1");
return;
}
if cnt.values().all(|x| *x == 1) {
println!("0");
}
println!("-1");
}
pub mod independent {
pub mod integer {
pub trait Int:
std::ops::Add<Output = Self>
+ std::ops::Sub<Output = Self>
+ std::ops::Mul<Output = Self>
+ std::ops::Div<Output = Self>
+ std::ops::Rem<Output = Self>
+ std::hash::Hash
+ PartialEq
+ Eq
+ PartialOrd
+ Ord
+ Copy
{
fn to_u8(&self) -> u8;
fn to_u16(&self) -> u16;
fn to_u32(&self) -> u32;
fn to_u64(&self) -> u64;
fn to_u128(&self) -> u128;
fn to_i8(&self) -> i8;
fn to_i16(&self) -> i16;
fn to_i32(&self) -> i32;
fn to_i64(&self) -> i64;
fn to_i128(&self) -> i128;
fn to_usize(&self) -> usize;
fn to_isize(&self) -> isize;
fn zero() -> Self;
fn one() -> Self;
}
macro_rules ! impl_integer_functions { ( $ ( $ name : ident , $ tpe : ident ) ,* ) => { $ ( fn $ name ( & self ) -> $ tpe { * self as $ tpe } ) * } ; }
macro_rules ! impl_integer { ( $ ( $ tpe : ident ) ,* ) => { $ ( impl Int for $ tpe { impl_integer_functions ! ( to_u8 , u8 , to_u16 , u16 , to_u32 , u32 , to_u64 , u64 , to_u128 , u128 , to_i8 , i8 , to_i16 , i16 , to_i32 , i32 , to_i64 , i64 , to_i128 , i128 , to_usize , usize , to_isize , isize ) ; fn zero ( ) -> Self { 0 } fn one ( ) -> Self { 1 } } ) * } ; }
impl_integer!(u8, u16, u32, u64, u128, i8, i16, i32, i64, i128, usize, isize);
}
}
pub mod ext {
pub mod range {
use crate::independent::integer::Int;
use std::cmp::{max, min};
use std::ops::{Bound, Range, RangeBounds, RangeInclusive};
pub trait RangeEx<T> {
fn width(&self) -> T;
fn empty(&self) -> bool;
fn contain_range(&self, inner: &Self) -> bool;
fn separate_range(&self, other: &Self) -> bool;
type ReturnRange;
fn overlap(&self, other: &Self) -> Self::ReturnRange;
}
impl<T: Int> RangeEx<T> for Range<T> {
fn width(&self) -> T {
if self.empty() {
T::zero()
} else {
self.end - self.start
}
}
fn empty(&self) -> bool {
!(self.start < self.end)
}
fn contain_range(&self, inner: &Self) -> bool {
self.start <= inner.start && inner.end <= self.end
}
fn separate_range(&self, other: &Self) -> bool {
self.end <= other.start || other.end <= self.start
}
type ReturnRange = Range<T>;
fn overlap(&self, other: &Self) -> Self::ReturnRange {
let left = max(self.start, other.start);
let right = min(self.end, other.end);
left..right
}
}
impl<T: Int> RangeEx<T> for RangeInclusive<T> {
fn width(&self) -> T {
if self.empty() {
T::zero()
} else {
*self.end() - *self.start() + T::one()
}
}
fn empty(&self) -> bool {
!(self.start() <= self.end())
}
fn contain_range(&self, inner: &Self) -> bool {
self.start() <= inner.start() && inner.end() <= self.end()
}
fn separate_range(&self, other: &Self) -> bool {
self.end() <= other.start() || other.end() <= self.start()
}
type ReturnRange = RangeInclusive<T>;
fn overlap(&self, other: &Self) -> Self::ReturnRange {
let left = *max(self.start(), other.start());
let right = *min(self.end(), other.end());
left..=right
}
}
pub trait IntRangeBounds<U: Int>: RangeBounds<U> {
#[doc = " inclusive"]
fn lower_bound(&self, lower_bound: U) -> U {
match self.start_bound() {
Bound::Included(x) => max(lower_bound, *x),
Bound::Excluded(x) => max(lower_bound, *x + U::one()),
Bound::Unbounded => lower_bound,
}
}
#[doc = " exclusive"]
fn upper_bound(&self, upper_bound: U) -> U {
match self.end_bound() {
Bound::Included(x) => min(upper_bound, *x + U::one()),
Bound::Excluded(x) => min(upper_bound, *x),
Bound::Unbounded => upper_bound,
}
}
fn to_harfopen(&self, lb: U, ub: U) -> Range<U> {
self.lower_bound(lb)..self.upper_bound(ub)
}
}
impl<T: ?Sized, U: Int> IntRangeBounds<U> for T where T: RangeBounds<U> {}
}
}
pub mod arraylist {
use crate::{ext::range::IntRangeBounds, independent::integer::Int};
use std::fmt::Formatter;
use std::iter::FromIterator;
use std::ops::{Index, IndexMut, RangeBounds};
use std::slice::Iter;
#[derive(Clone, PartialEq, Eq)]
pub struct List<T> {
pub vec: Vec<T>,
}
impl<T> List<T> {
#[inline]
pub fn new() -> List<T> {
List { vec: vec![] }
}
#[inline]
pub fn init(init: T, n: i32) -> List<T>
where
T: Clone,
{
List {
vec: vec![init; n as usize],
}
}
#[inline]
pub fn from_vec(vec: Vec<T>) -> List<T> {
List { vec }
}
#[inline]
pub fn ilen(&self) -> i32 {
self.vec.len() as i32
}
#[inline]
pub fn iter(&self) -> Iter<'_, T> {
self.vec.iter()
}
#[inline]
pub fn push(&mut self, item: T) {
self.vec.push(item);
}
#[inline]
pub fn sort(&mut self)
where
T: Ord,
{
self.vec.sort();
}
#[inline]
pub fn reverse(&mut self) {
self.vec.reverse();
}
#[inline]
pub fn sort_by<F>(&mut self, compare: F)
where
F: FnMut(&T, &T) -> std::cmp::Ordering,
{
self.vec.sort_by(compare)
}
#[inline]
pub fn sort_by_key<K, F>(&mut self, compare: F)
where
F: FnMut(&T) -> K,
K: Ord,
{
self.vec.sort_by_key(compare)
}
#[inline]
pub fn first(&self) -> Option<&T> {
self.vec.first()
}
#[inline]
pub fn last(&self) -> Option<&T> {
self.vec.last()
}
#[inline]
pub fn pop(&mut self) -> Option<T> {
self.vec.pop()
}
#[inline]
pub fn swap(&mut self, i: i32, j: i32) {
self.vec.swap(i as usize, j as usize);
}
#[inline]
pub fn append(&mut self, mut other: Self) {
self.vec.append(&mut other.vec);
}
#[inline]
pub fn extend(&mut self, other: impl Iterator<Item = T>) {
self.vec.extend(other);
}
#[inline]
pub fn mirror(&self) -> std::iter::Cloned<Iter<T>>
where
T: Clone,
{
self.iter().cloned()
}
#[inline]
pub fn map<B, F>(&self, f: F) -> List<B>
where
T: Clone,
F: FnMut(T) -> B,
{
self.mirror().map(f).collect()
}
#[inline]
pub fn filter<P>(&self, predicate: P) -> List<T>
where
T: Clone,
P: FnMut(&T) -> bool,
{
self.mirror().filter(predicate).collect()
}
#[inline]
pub fn filter_map<B, F>(&self, f: F) -> List<B>
where
T: Clone,
F: FnMut(T) -> Option<B>,
{
self.mirror().filter_map(f).collect()
}
#[inline]
pub fn any<P>(&self, predicate: P) -> bool
where
P: FnMut(&T) -> bool,
{
self.iter().any(predicate)
}
#[inline]
pub fn all<P>(&self, predicate: P) -> bool
where
P: FnMut(&T) -> bool,
{
self.iter().all(predicate)
}
#[inline]
pub fn sum(&self) -> T
where
T: Int,
{
self.iter().cloned().fold(T::zero(), |acc, x| acc + x)
}
#[inline]
pub fn enumerate(&self) -> List<(i32, T)>
where
T: Clone,
{
self.mirror()
.enumerate()
.map(|p| (p.0 as i32, p.1))
.collect()
}
#[inline]
pub fn find<P>(&self, mut predicate: P) -> Option<&T>
where
P: FnMut(&T) -> bool,
{
self.iter().find(|x| predicate(*x))
}
#[inline]
pub fn index_of<P>(&self, mut predicate: P) -> Option<i32>
where
P: FnMut(&T) -> bool,
{
self.iter()
.enumerate()
.find(|&(_i, x)| predicate(x))
.map(|p| p.0 as i32)
}
#[inline]
pub fn to<B: FromIterator<T>>(&self) -> B
where
T: Clone,
{
self.mirror().collect()
}
#[inline]
pub fn min(&self) -> Option<&T>
where
T: Ord,
{
self.iter().min()
}
#[inline]
pub fn max(&self) -> Option<&T>
where
T: Ord,
{
self.iter().max()
}
#[inline]
pub fn argmin(&self) -> Option<i32>
where
T: Ord,
{
let item = self.iter().min()?;
self.iter()
.enumerate()
.find(|p| p.1 == item)
.map(|p| p.0 as i32)
}
#[inline]
pub fn argmax(&self) -> Option<i32>
where
T: Ord,
{
let item = self.iter().max()?;
self.iter()
.enumerate()
.find(|p| p.1 == item)
.map(|p| p.0 as i32)
}
#[inline]
pub fn part<U>(&self, range: U) -> List<T>
where
T: Clone,
U: RangeBounds<i32>,
{
List::from_vec(
self.vec[range.lower_bound(0) as usize..range.upper_bound(self.ilen()) as usize]
.to_vec(),
)
}
#[inline]
pub fn first_exn(&self) -> &T {
self.first().unwrap()
}
#[inline]
pub fn last_exn(&self) -> &T {
self.last().unwrap()
}
#[inline]
pub fn pop_exn(&mut self) -> T {
self.pop().unwrap()
}
#[inline]
pub fn min_exn(&self) -> &T
where
T: Ord,
{
self.min().unwrap()
}
#[inline]
pub fn max_exn(&self) -> &T
where
T: Ord,
{
self.max().unwrap()
}
#[inline]
pub fn argmin_exn(&self) -> i32
where
T: Ord,
{
self.argmin().unwrap()
}
#[inline]
pub fn argmax_exn(&self) -> i32
where
T: Ord,
{
self.argmax().unwrap()
}
#[inline]
pub fn find_exn<P>(&self, predicate: P) -> &T
where
P: FnMut(&T) -> bool,
{
self.find(predicate).unwrap()
}
#[inline]
pub fn index_of_exn<P>(&self, predicate: P) -> i32
where
P: FnMut(&T) -> bool,
{
self.index_of(predicate).unwrap()
}
}
impl<T> Index<i32> for List<T> {
type Output = T;
#[inline]
fn index(&self, index: i32) -> &Self::Output {
if cfg!(debug_assertions) {
self.vec.index(index as usize)
} else {
unsafe { self.vec.get_unchecked(index as usize) }
}
}
}
impl<T> IndexMut<i32> for List<T> {
#[inline]
fn index_mut(&mut self, index: i32) -> &mut Self::Output {
if cfg!(debug_assertions) {
self.vec.index_mut(index as usize)
} else {
unsafe { self.vec.get_unchecked_mut(index as usize) }
}
}
}
impl<T> FromIterator<T> for List<T> {
fn from_iter<U: IntoIterator<Item = T>>(iter: U) -> Self {
let mut vec = vec![];
for i in iter {
vec.push(i);
}
List { vec }
}
}
impl<T> IntoIterator for List<T> {
type Item = T;
type IntoIter = std::vec::IntoIter<T>;
fn into_iter(self) -> std::vec::IntoIter<T> {
self.vec.into_iter()
}
}
impl<'a, T> IntoIterator for &'a List<T> {
type Item = &'a T;
type IntoIter = Iter<'a, T>;
fn into_iter(self) -> Iter<'a, T> {
self.vec.iter()
}
}
impl<T: std::fmt::Display> std::fmt::Display for List<T> {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
write!(
f,
"{}",
self.iter()
.map(|x| format!("{}", x))
.collect::<Vec<_>>()
.join(" ")
)
}
}
impl<T: std::fmt::Debug> std::fmt::Debug for List<T> {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
write!(
f,
"[{}]",
self.iter()
.map(|x| format!("{:?}", x))
.collect::<Vec<_>>()
.join(", ")
)
}
}
impl<T> From<Vec<T>> for List<T> {
fn from(vec: Vec<T>) -> Self {
Self::from_vec(vec)
}
}
impl<T: Clone> From<&[T]> for List<T> {
fn from(slice: &[T]) -> Self {
slice.iter().cloned().collect()
}
}
#[macro_export]
macro_rules ! list { ( ) => { $ crate :: arraylist :: List :: new ( ) } ; ( $ init : expr ; $ ( $ dim : expr ) ;* ) => { list ! ( $ ( $ dim ) ;* => $ init ) } ; ( $ head : expr ; $ ( $ tail : expr ) ;* => $ init : expr ) => { $ crate :: arraylist :: List :: init ( list ! ( $ ( $ tail ) ;* => $ init ) , $ head ) } ; ( $ head : expr => $ init : expr ) => { $ crate :: arraylist :: List :: init ( $ init , $ head ) } ; }
}
pub mod data_structure {
pub mod counter {
use std::collections::HashMap;
use std::hash::Hash;
use std::ops::*;
#[derive(Clone, Debug)]
pub struct Counter<K: Eq + Hash> {
pub cnt: HashMap<K, i64>,
pub d: i64,
}
impl<K: Eq + Hash> Counter<K> {
pub fn new() -> Counter<K> {
Counter {
cnt: HashMap::new(),
d: 0,
}
}
#[doc = " Remove key when the value <= 0"]
pub fn dec(&mut self, key: K, delta: i64) {
if self.by_ref(&key) - delta <= 0 {
self.remove(&key);
} else {
*self.cnt.get_mut(&key).unwrap() -= delta;
}
}
pub fn by_ref(&self, key: &K) -> i64 {
*self.cnt.get(key).unwrap_or(&self.d)
}
}
impl<K: Eq + Hash> Deref for Counter<K> {
type Target = HashMap<K, i64>;
fn deref(&self) -> &Self::Target {
&self.cnt
}
}
impl<K: Eq + Hash> DerefMut for Counter<K> {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.cnt
}
}
impl<K: Eq + Hash> Index<K> for Counter<K> {
type Output = i64;
fn index(&self, index: K) -> &Self::Output {
self.cnt.get(&index).unwrap_or(&self.d)
}
}
impl<K: Eq + Hash + Clone> IndexMut<K> for Counter<K> {
fn index_mut(&mut self, index: K) -> &mut i64 {
if !self.cnt.contains_key(&index) {
self.cnt.insert(index.clone(), self.d);
}
self.cnt.get_mut(&index).unwrap()
}
}
impl<K: Eq + Hash> std::iter::FromIterator<K> for Counter<K> {
fn from_iter<T: IntoIterator<Item = K>>(iter: T) -> Self {
let mut cnt = HashMap::new();
for i in iter {
*cnt.entry(i).or_insert(0) += 1;
}
Counter { cnt, d: 0 }
}
}
impl<T: Eq + Hash + Clone> Add for Counter<T> {
type Output = Counter<T>;
fn add(self, other: Counter<T>) -> Counter<T> {
let mut ret = Counter::new();
for (k, v) in self.iter().chain(other.iter()) {
ret[k.clone()] += *v;
}
ret
}
}
impl<T: Eq + Hash + Clone> AddAssign for Counter<T> {
fn add_assign(&mut self, other: Self) {
*self = self.clone().add(other);
}
}
}
}
pub mod scanner {
use crate::arraylist::List;
use std::io::{stdin, BufReader, Bytes, Read, Stdin};
use std::str::FromStr;
pub struct Scanner {
buf: Bytes<BufReader<Stdin>>,
}
impl Scanner {
pub fn new() -> Scanner {
Scanner {
buf: BufReader::new(stdin()).bytes(),
}
}
pub fn read_next<T: FromStr>(&mut self) -> Option<T> {
let token = self
.buf
.by_ref()
.map(|c| c.unwrap() as char)
.skip_while(|c| c.is_whitespace())
.take_while(|c| !c.is_whitespace())
.collect::<String>();
token.parse::<T>().ok()
}
pub fn read<T: FromStr>(&mut self) -> T {
self.read_next().unwrap()
}
pub fn readn<T: FromStr>(&mut self, n: i32) -> List<T> {
(0..n).map(|_| self.read::<T>()).collect()
}
pub fn chars(&mut self) -> List<char> {
self.read::<String>().chars().collect()
}
}
}
pub mod misc {
use crate::arraylist::List;
use crate::independent::integer::Int;
use std::collections::{BTreeSet, HashMap};
pub const CONST_1E9_7: i64 = 1_000_000_007;
pub fn rep<'a, S, T>(n: i32, mut f: S) -> List<T>
where
S: FnMut() -> T + 'a,
{
(0..n).map(|_| f()).collect::<List<T>>()
}
pub fn adjacent4(y: i32, x: i32, h: i32, w: i32) -> impl Iterator<Item = (i32, i32)> {
const DYDX: [(i32, i32); 4] = [(-1, 0), (1, 0), (0, -1), (0, 1)];
DYDX.iter().filter_map(move |&(dy, dx)| {
let ny = y + dy;
let nx = x + dx;
if nx >= 0 && nx < w && ny >= 0 && ny < h {
Some((ny, nx))
} else {
None
}
})
}
pub fn adjacent8(y: i32, x: i32, h: i32, w: i32) -> impl Iterator<Item = (i32, i32)> {
const DYDX: [(i32, i32); 8] = [
(-1, 0),
(1, 0),
(0, -1),
(0, 1),
(-1, -1),
(-1, 1),
(1, -1),
(1, 1),
];
DYDX.iter().filter_map(move |&(dy, dx)| {
let ny = y + dy;
let nx = x + dx;
if nx >= 0 && nx < w && ny >= 0 && ny < h {
Some((ny, nx))
} else {
None
}
})
}
pub fn run_length_encoding<T: Clone + PartialEq>(slice: &List<T>) -> List<(i64, T)> {
slice.mirror().fold(List::new(), |mut acc, x| {
if let Some((cnt, item)) = acc.pop() {
if item == x {
acc.push((cnt + 1, x));
} else {
acc.push((cnt, item));
acc.push((1, x));
}
} else {
acc.push((1, x));
}
acc
})
}
pub fn indices_by_elem<T: Eq + std::hash::Hash + Clone>(
slice: &List<T>,
) -> std::collections::HashMap<T, List<i32>> {
let mut hmap = std::collections::HashMap::new();
for i in 0..slice.ilen() {
hmap.entry(slice[i].clone()).or_insert(List::new()).push(i);
}
hmap
}
pub fn combine<S: Clone, T: Clone, U: std::iter::FromIterator<(S, T)>>(
left: &[S],
right: &[T],
) -> U {
let mut ret = vec![];
for i in 0..left.len() {
for j in 0..right.len() {
ret.push((left[i].clone(), right[j].clone()));
}
}
ret.into_iter().collect::<U>()
}
pub fn split<T: PartialEq + Clone>(slice: &List<T>, sep: T) -> List<List<T>> {
slice
.iter()
.fold(List::from(vec![List::new()]), |mut acc, x| {
if x == &sep {
acc.push(List::new());
acc
} else {
let last = acc.ilen() - 1;
acc[last].push(x.clone());
acc
}
})
}
pub fn join<T: std::fmt::Display>(slice: &List<T>, sep: &str) -> String {
let strings = slice.iter().map(|t| format!("{}", t)).collect::<Vec<_>>();
strings.join(sep)
}
pub fn coord_comp(slice: &List<i64>) -> (List<i64>, HashMap<i64, i32>) {
let mut set = BTreeSet::new();
for &item in slice {
set.insert(item);
}
let mut hmap = HashMap::new();
for (i, &v) in set.iter().enumerate() {
hmap.insert(v, i as i32);
}
(set.into_iter().collect::<List<_>>(), hmap)
}
pub fn shakutori(n: i32, k: i64, a: &List<i64>) -> i32 {
let mut sum = 0;
let mut right = 0;
let mut ret = 0;
for left in 0..n {
while right < n && sum <= k {
sum += a[right];
right += 1;
}
ret += right - left;
if right == left {
right += 1;
} else {
sum -= a[left];
}
}
ret
}
pub fn inverse(a: &List<i32>, n: i32) -> List<i32> {
let mut inv = List::init(0, n);
for i in 0..a.ilen() {
inv[a[i]] = i;
}
inv
}
pub fn pow(mut a: i64, mut n: i64) -> i64 {
let mut res = 1;
while n > 0 {
if n & 1 == 1 {
res *= a;
}
a = a * a;
n >>= 1;
}
res
}
pub fn ceil_div<T: Int>(x: T, y: T) -> T {
(x + y - T::one()) / y
}
pub fn ceil_mod<T: Int>(x: T, y: T) -> T {
ceil_div(x, y) * y
}
pub fn unzip<P: Clone, Q: Clone>(v: &List<(P, Q)>) -> (List<P>, List<Q>) {
(
v.iter().map(|t| t.0.clone()).collect(),
v.iter().map(|t| t.1.clone()).collect(),
)
}
pub fn unzip3<P: Clone, Q: Clone, R: Clone>(
v: &List<(P, Q, R)>,
) -> (List<P>, List<Q>, List<R>) {
(
v.iter().map(|t| t.0.clone()).collect(),
v.iter().map(|t| t.1.clone()).collect(),
v.iter().map(|t| t.2.clone()).collect(),
)
}
pub fn is_palindrome<T: Clone + Eq>(chars: &List<T>) -> bool {
let s = chars.clone();
let mut t = s.clone();
t.reverse();
(0..s.ilen()).filter(|&i| s[i] == t[i]).count() as i32 == s.ilen()
}
}