結果

問題 No.1900 Don't be Powers of 2
ユーザー とりゐとりゐ
提出日時 2022-04-09 00:37:23
言語 PyPy3
(7.3.15)
結果
AC  
実行時間 1,207 ms / 2,000 ms
コード長 2,986 bytes
コンパイル時間 259 ms
コンパイル使用メモリ 87,292 KB
実行使用メモリ 291,196 KB
最終ジャッジ日時 2023-08-19 03:01:51
合計ジャッジ時間 15,384 ms
ジャッジサーバーID
(参考情報)
judge14 / judge12
このコードへのチャレンジ
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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 77 ms
71,452 KB
testcase_01 AC 77 ms
71,448 KB
testcase_02 AC 81 ms
76,544 KB
testcase_03 AC 313 ms
79,064 KB
testcase_04 AC 313 ms
79,060 KB
testcase_05 AC 310 ms
79,132 KB
testcase_06 AC 312 ms
79,540 KB
testcase_07 AC 317 ms
79,124 KB
testcase_08 AC 185 ms
81,108 KB
testcase_09 AC 145 ms
79,172 KB
testcase_10 AC 112 ms
78,468 KB
testcase_11 AC 126 ms
79,144 KB
testcase_12 AC 211 ms
82,200 KB
testcase_13 AC 89 ms
77,764 KB
testcase_14 AC 241 ms
78,928 KB
testcase_15 AC 88 ms
77,996 KB
testcase_16 AC 89 ms
77,928 KB
testcase_17 AC 291 ms
78,872 KB
testcase_18 AC 250 ms
79,116 KB
testcase_19 AC 292 ms
79,148 KB
testcase_20 AC 238 ms
78,996 KB
testcase_21 AC 234 ms
78,848 KB
testcase_22 AC 225 ms
78,852 KB
testcase_23 AC 98 ms
78,592 KB
testcase_24 AC 172 ms
79,000 KB
testcase_25 AC 198 ms
79,332 KB
testcase_26 AC 1,108 ms
291,108 KB
testcase_27 AC 354 ms
108,476 KB
testcase_28 AC 237 ms
83,068 KB
testcase_29 AC 240 ms
83,184 KB
testcase_30 AC 112 ms
78,856 KB
testcase_31 AC 76 ms
71,452 KB
testcase_32 AC 76 ms
71,700 KB
testcase_33 AC 1,039 ms
286,240 KB
testcase_34 AC 1,084 ms
286,444 KB
testcase_35 AC 1,207 ms
291,196 KB
testcase_36 AC 986 ms
265,324 KB
testcase_37 AC 283 ms
82,376 KB
testcase_38 AC 315 ms
132,156 KB
testcase_39 AC 220 ms
100,600 KB
testcase_40 AC 339 ms
80,436 KB
testcase_41 AC 349 ms
82,804 KB
testcase_42 AC 76 ms
71,608 KB
testcase_43 AC 77 ms
71,816 KB
testcase_44 AC 76 ms
71,916 KB
権限があれば一括ダウンロードができます

ソースコード

diff #

from collections import deque
 
class MaxFlow:
    inf = 10**18
 
    class E:
        def __init__(self,to,cap):
            self.to = to
            self.cap = cap
            self.rev = None
 
    def __init__(self,n):
        self.n = n
        self.graph = [[] for _ in range(n)]
 
    def add_edge(self, fr, to, cap):
        graph = self.graph
        edge = self.E(to,cap)
        edge2 = self.E(fr,0)
        edge.rev = edge2
        edge2.rev = edge
        graph[fr].append(edge)
        graph[to].append(edge2)
 
    def bfs(self, s, t):
        level = self.level = [self.n]*self.n
        q = deque([s])
        level[s] = 0
        while q:
            now = q.popleft()
            lw = level[now]+1
            for e in self.graph[now]:
                if e.cap and level[e.to]> lw:
                    level[e.to] = lw
                    if e.to == t:
                        return True
                    q.append(e.to)
        return False
 
    def dfs(self, s, t, up):
        graph = self.graph
        it = self.it
        level = self.level
 
        st = deque([t])
        while st:
            v = st[-1]
            if v == s:
                st.pop()
                flow = up
                for w in st:
                    e = graph[w][it[w]].rev
                    flow = min(flow, e.cap)
                for w in st:
                    e = graph[w][it[w]]
                    e.cap += flow
                    e.rev.cap -= flow
                return flow
            lv = level[v]-1
            while it[v] < len(graph[v]):
                e = graph[v][it[v]]
                re = e.rev
                if re.cap == 0 or lv != level[e.to]:
                    it[v] += 1
                    continue
                st.append(e.to)
                break
            if it[v] == len(graph[v]):
                st.pop()
                level[v] = self.n
 
        return 0
 
    def flow(self,s,t,flow_limit=inf):
        flow = 0
        while flow < flow_limit and self.bfs(s,t):
            self.it = [0]*self.n
            while flow < flow_limit:
                f = self.dfs(s,t,flow_limit-flow)
                if f == 0:
                    break
                flow += f
        return flow
 
    def min_cut(self,s):
        visited = [0]*self.n
        q = deque([s])
        while q:
            v = q.pop()
            visited[v] = 1
            for e in self.graph[v]:
                if e.cap and not visited[e.to]:
                    q.append(e.to)
        return visited

def popcount(m):
  k=m
  cnt=0
  while k:
    cnt+=k&1
    k>>=1
  return cnt
  
n=int(input())
a=list(map(int,input().split()))

s,t=n,n+1
g=MaxFlow(n+2)
inf=n+10

for i in range(n):
  if popcount(a[i])%2==0:
    g.add_edge(s,i,1)
  else:
    g.add_edge(i,t,1)

for i in range(n):
  for j in range(i+1,n):
    if popcount(a[i]^a[j])==1:
      if popcount(a[i])%2==0:
        g.add_edge(i,j,inf)
      else:
        g.add_edge(j,i,inf)
print(n-g.flow(s,t))
0