結果
問題 | No.1843 Tree ANDistance |
ユーザー | Shirotsume |
提出日時 | 2022-02-18 21:45:22 |
言語 | PyPy3 (7.3.15) |
結果 |
AC
|
実行時間 | 961 ms / 2,000 ms |
コード長 | 2,212 bytes |
コンパイル時間 | 203 ms |
コンパイル使用メモリ | 82,176 KB |
実行使用メモリ | 259,252 KB |
最終ジャッジ日時 | 2024-06-29 08:38:19 |
合計ジャッジ時間 | 21,431 ms |
ジャッジサーバーID (参考情報) |
judge2 / judge4 |
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ファイルパターン | 結果 |
---|---|
other | AC * 38 |
ソースコード
class dsu(): n=1 parent_or_size=[-1 for i in range(n)] def __init__(self,N): self.n=N self.parent_or_size=[-1 for i in range(N)] def merge(self,a,b): assert 0<=a<self.n, "0<=a<n,a={0},n={1}".format(a,self.n) assert 0<=b<self.n, "0<=b<n,b={0},n={1}".format(b,self.n) x=self.leader(a) y=self.leader(b) if x==y: return x if (-self.parent_or_size[x]<-self.parent_or_size[y]): x,y=y,x self.parent_or_size[x]+=self.parent_or_size[y] self.parent_or_size[y]=x return x def same(self,a,b): assert 0<=a<self.n, "0<=a<n,a={0},n={1}".format(a,self.n) assert 0<=b<self.n, "0<=b<n,b={0},n={1}".format(b,self.n) return self.leader(a)==self.leader(b) def leader(self,a): assert 0<=a<self.n, "0<=a<n,a={0},n={1}".format(a,self.n) if (self.parent_or_size[a]<0): return a self.parent_or_size[a]=self.leader(self.parent_or_size[a]) return self.parent_or_size[a] def size(self,a): assert 0<=a<self.n, "0<=a<n,a={0},n={1}".format(a,self.n) return -self.parent_or_size[self.leader(a)] def groups(self): leader_buf=[0 for i in range(self.n)] group_size=[0 for i in range(self.n)] for i in range(self.n): leader_buf[i]=self.leader(i) group_size[leader_buf[i]]+=1 result=[[] for i in range(self.n)] for i in range(self.n): result[leader_buf[i]].append(i) result2=[] for i in range(self.n): if len(result[i])>0: result2.append(result[i]) return result2 n = int(input()) mod = 10 ** 9 + 7 abc = [list(map(int,input().split())) for _ in range(n - 1)] ans = 0 for bit in range(32): U = dsu(n + 1) for i in range(n - 1): a, b, c = abc[i] a -= 1; b -= 1 if 1 & (c >> bit): U.merge(a, b) s = set() for i in range(n): if U.leader(i) in s: continue else: s.add(U.leader(i)) c = U.size(i) ans += pow(2, bit, mod) * c * (c - 1) // 2 ans %= mod print(ans)