#931271 (PyPy3) No.274 The Wall

• 問題: No.274 The Wall
• ユーザー: timi
• 提出日時: 2023-11-24 23:30:06
• 言語: PyPy3 (7.3.15)
• 結果: AC
• 実行時間: 176 ms / 2,000 ms
• コード長: 2,062 bytes
• コンパイル時間: 515 ms
• コンパイル使用メモリ: 81,792 KB
• 実行使用メモリ: 79,616 KB
• 最終ジャッジ日時: 2024-09-26 09:49:03
• 合計ジャッジ時間: 3,768 ms
• ジャッジサーバーID （参考情報）: judge5 / judge3

ファイルパターン	結果
sample	AC * 4
other	AC * 22

ソースコード

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from collections import deque
import sys
sys.setrecursionlimit(10**7)
def scc(N, G, RG):
    order = []
    used = [0]*N
    def dfs(s):
        used[s] = 1
        for t in G[s]:
            if not used[t]:
                dfs(t)
        order.append(s)
    for i in range(N):
        if not used[i]:
            dfs(i)
    group = [-1]*N
    label = 0
    order.reverse()
    for s in order:
        if group[s] != -1:
            continue
        que = deque([s])
        group[s] = label
        while que:
            v = que.popleft()
            for w in RG[v]:
                if group[w] != -1:
                    continue
                que.append(w)
                group[w] = label
        label += 1
    return group # topological ordering
N,M=map(int, input().split())
G = [[] for i in range(2*N)]
RG = [[] for i in range(2*N)]
# add (a ∨ b)
# a =  x_i if neg_i = 0
# a = ~x_i if neg_i = 1
def add_edge(i, neg_i, j, neg_j):
    if neg_i:
        i0 = i+N; i1 = i
    else:
        i0 = i; i1 = i+N
    if neg_j:
        j0 = j+N; j1 = j
    else:
        j0 = j; j1 = j+N
    # add (~a ⇒ b)
    G[i1].append(j0); RG[j0].append(i1)
    # add (~b ⇒ a)
    G[j1].append(i0); RG[i0].append(j1)
group = scc(2*N, G, RG)
# check if the formula is satisfiable
def check(group):
    for i in range(N):
        if group[i] == group[i+N]:
            return False
    return True
# assign values to variables
def assign(group):
    res = [0]*N
    for i in range(N):
        if group[i] > group[i+N]:
            res[i] = 1
    return res
A=[]
for i in range(N):
  x,y=map(int, input().split())
  A.append((x,y))
for i in range(N-1):
  for j in range(i+1,N):
    al,ar=A[i];bl,br=A[j]
    p,q=0,0
    if al<=br and bl<=ar:
      add_edge(i,1,j,1)
      add_edge(i,0,j,0)
      p=1
    cl,cr=M-1-br,M-1-bl 
    if al<=cr and cl<=ar:
      add_edge(i,0,j,1)
      add_edge(i,1,j,0)   
      q=1 
    if p+q==2:
      print('NO')
      exit()
#print(G,RG)
A=scc(2*N,G,RG)
for i in range(N):
  if A[i]==A[i+N]:
    print('NO')
    exit()
print('YES')
 
 
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