Problem:


Score : 500 points

Problem Statement

We have a deck consisting of N cards. Each card has an integer written on it. The integer on the i-th card from the top is a_i.

Two people X and Y will play a game using this deck. Initially, X has a card with Z written on it in his hand, and Y has a card with W written on it in his hand. Then, starting from X, they will alternately perform the following action:

Draw some number of cards from the top of the deck. Then, discard the card in his hand and keep the last drawn card instead. Here, at least one card must be drawn.

The game ends when there is no more card in the deck. The score of the game is the absolute difference of the integers written on the cards in the two players' hand.

X will play the game so that the score will be maximized, and Y will play the game so that the score will be minimized. What will be the score of the game?

Constraints

All input values are integers.

1 \leq N \leq 2000

1 \leq Z, W, a_i \leq 10^9

Input

Input is given from Standard Input in the following format:

N Z W
a_1 a_2 ... a_N

Output

Print the score.

Sample Input 1

3 100 100
10 1000 100

Sample Output 1

900

If X draws two cards first, Y will draw the last card, and the score will be |1000 - 100| = 900.

Sample Input 2

3 100 1000
10 100 100

Sample Output 2

900

If X draws all the cards first, the score will be |1000 - 100| = 900.

Sample Input 3

5 1 1
1 1 1 1 1

Sample Output 3

0

Sample Input 4

1 1 1
1000000000

Sample Output 4

999999999



Sample input:
3 100 100
10 1000 100


Sample output:
900

Submission status: Runtime Error

Solution code:
import sys
line = sys.stdin.readline().strip()
n, z, w = map(int, line.split()[:3])
line = sys.stdin.readline().strip()
a = list(map(int, line.split()[:n]))
#print(n, z, w)
#print(a)

def think_x(z, w, a, turn):
    if len(a) == 0:
        return abs(z - w)
    result = 0
    result_i = None
    for i in range(len(a)):
        r = think_y(a[i], w, a[i+1:], turn + 1)
        if r >= result:
            result = r
            result_i = i
    #print("# X", turn, result_i, result)
    return result

def think_y(z, w, a, turn):
    if len(a) == 0:
        return abs(z - w)
    result = 9999999999999999999999
    result_i = None
    for i in range(len(a)):
        r = think_x(z, a[i], a[i+1:], turn + 1)
        if r <= result:
            result = r
            result_i = i
    #print("# Y", turn, result_i, result)
    return result

print(think_x(z, w, a, 1))

Submission status: Runtime Error

Solution code:
#!/usr/bin/python
# coding: utf-8

from sys import stdin

memo = {}

# それぞれ z 枚目, w 枚目を持っている局面での最適解
def solve(z, w, player):
  global a, memo
  n = max(z, w) + 1  # 取り終わっている枚数
  if n == len(a): return abs(a[z] - a[w])
  if (z, w, player) in memo: return memo[(z, w, player)]

  m      = 0   if player == 0 else 1000000000
  minmax = max if player == 0 else min
  for i in range(n, len(a)):
    if player == 0: zz = i; ww = w
    else:           ww = i; zz = z
    m = minmax(m, solve(zz, ww, 1 - player))
  memo[(z, w, player)] = m
  return m

N, Z, W = map(int, stdin.readline().split())
a       = map(int, stdin.readline().split())
if len(a) != N: raise

# Z, Wを山の先頭に置く
a = [Z, W] + a

print(solve(0, 1, 0))

Submission status: Runtime Error

Solution code:
n,z,w=[int(i) for i in input().split()]
a=[int(i) for i in input().split()]
max=0
min=0
maxi=0
mini=0

for i in range(n):
    if a[i]>max:
        max=a[i]
        maxi=i
    if a[i]<min
        min=a[i]
        mini=i

if 

a_max=max(a)
a_min=min(a)
a_last=a[-1]
#print(a_max,a_min,a_last)

answer=min(abs(a_last-w), abs(a_max-a_last), abs(a_last-a_min))

print(answer)

Submission status: Runtime Error

Solution code:
# coding: utf-8
# Here your code !
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
 
import numpy as np
import bisect

N , Z ,W = input().split()
N = int(N)
Z = int(Z)
W = int(W)
a = input().split()
a = [int(i) for i in reversed(a)]

rst = [ np.abs(W - a[0]) , np.abs(a[1] - a[0]) ]
print(np.max(rst))

Submission status: Runtime Error

Solution code:
a=int(input())
2.for i in range(a):
3.    if(i*i>a):
4.        print((i-1)*(i-1))
5.        break
6. 
7.if a<=2: print("1")

Submission status: Runtime Error

Solution code:
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