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 2022-04-08 23:07:06
言語 PyPy3
(7.3.15)
結果
AC  
実行時間 1,972 ms / 2,000 ms
コード長 2,949 bytes
コンパイル時間 266 ms
コンパイル使用メモリ 82,448 KB
実行使用メモリ 290,176 KB
最終ジャッジ日時 2024-05-06 08:50:35
合計ジャッジ時間 33,479 ms
ジャッジサーバーID
(参考情報)
judge2 / judge5
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 53 ms
54,400 KB
testcase_01 AC 45 ms
54,272 KB
testcase_02 AC 44 ms
54,528 KB
testcase_03 AC 1,183 ms
77,696 KB
testcase_04 AC 1,207 ms
77,696 KB
testcase_05 AC 1,228 ms
77,772 KB
testcase_06 AC 1,183 ms
77,604 KB
testcase_07 AC 1,184 ms
77,700 KB
testcase_08 AC 327 ms
79,232 KB
testcase_09 AC 199 ms
77,776 KB
testcase_10 AC 114 ms
76,928 KB
testcase_11 AC 149 ms
77,312 KB
testcase_12 AC 490 ms
80,344 KB
testcase_13 AC 89 ms
76,368 KB
testcase_14 AC 943 ms
77,440 KB
testcase_15 AC 80 ms
76,340 KB
testcase_16 AC 80 ms
76,320 KB
testcase_17 AC 1,087 ms
77,440 KB
testcase_18 AC 878 ms
77,568 KB
testcase_19 AC 1,196 ms
77,824 KB
testcase_20 AC 846 ms
77,504 KB
testcase_21 AC 784 ms
77,312 KB
testcase_22 AC 760 ms
77,312 KB
testcase_23 AC 324 ms
77,440 KB
testcase_24 AC 502 ms
77,312 KB
testcase_25 AC 615 ms
77,328 KB
testcase_26 AC 1,920 ms
290,176 KB
testcase_27 AC 722 ms
106,784 KB
testcase_28 AC 557 ms
81,536 KB
testcase_29 AC 544 ms
81,280 KB
testcase_30 AC 119 ms
77,244 KB
testcase_31 AC 45 ms
54,272 KB
testcase_32 AC 43 ms
54,400 KB
testcase_33 AC 1,904 ms
285,824 KB
testcase_34 AC 1,914 ms
285,824 KB
testcase_35 AC 1,972 ms
289,920 KB
testcase_36 AC 1,692 ms
263,916 KB
testcase_37 AC 728 ms
80,384 KB
testcase_38 AC 537 ms
131,200 KB
testcase_39 AC 400 ms
98,176 KB
testcase_40 AC 1,253 ms
78,704 KB
testcase_41 AC 1,202 ms
81,292 KB
testcase_42 AC 43 ms
54,016 KB
testcase_43 AC 42 ms
54,528 KB
testcase_44 AC 40 ms
54,400 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):
  return bin(m).count('1')
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