結果
問題 | No.2337 Equidistant |
ユーザー | mkawa2 |
提出日時 | 2024-09-10 21:33:49 |
言語 | PyPy3 (7.3.15) |
結果 |
AC
|
実行時間 | 1,283 ms / 4,000 ms |
コード長 | 2,633 bytes |
コンパイル時間 | 486 ms |
コンパイル使用メモリ | 82,556 KB |
実行使用メモリ | 146,992 KB |
最終ジャッジ日時 | 2024-09-10 21:34:10 |
合計ジャッジ時間 | 21,503 ms |
ジャッジサーバーID (参考情報) |
judge2 / judge3 |
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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 | 37 ms
53,076 KB |
testcase_01 | AC | 37 ms
54,428 KB |
testcase_02 | AC | 37 ms
54,368 KB |
testcase_03 | AC | 37 ms
54,152 KB |
testcase_04 | AC | 38 ms
53,160 KB |
testcase_05 | AC | 37 ms
53,556 KB |
testcase_06 | AC | 132 ms
78,016 KB |
testcase_07 | AC | 125 ms
78,232 KB |
testcase_08 | AC | 123 ms
77,696 KB |
testcase_09 | AC | 123 ms
77,988 KB |
testcase_10 | AC | 129 ms
78,056 KB |
testcase_11 | AC | 876 ms
127,632 KB |
testcase_12 | AC | 841 ms
127,440 KB |
testcase_13 | AC | 859 ms
127,720 KB |
testcase_14 | AC | 840 ms
127,644 KB |
testcase_15 | AC | 860 ms
127,568 KB |
testcase_16 | AC | 842 ms
127,656 KB |
testcase_17 | AC | 886 ms
127,364 KB |
testcase_18 | AC | 876 ms
127,536 KB |
testcase_19 | AC | 837 ms
127,564 KB |
testcase_20 | AC | 863 ms
127,736 KB |
testcase_21 | AC | 950 ms
146,992 KB |
testcase_22 | AC | 550 ms
129,440 KB |
testcase_23 | AC | 690 ms
127,472 KB |
testcase_24 | AC | 1,193 ms
146,524 KB |
testcase_25 | AC | 780 ms
129,416 KB |
testcase_26 | AC | 1,283 ms
146,892 KB |
testcase_27 | AC | 684 ms
129,060 KB |
testcase_28 | AC | 706 ms
129,136 KB |
ソースコード
import sys # sys.setrecursionlimit(200005) # sys.set_int_max_str_digits(200005) int1 = lambda x: int(x)-1 pDB = lambda *x: print(*x, end="\n", file=sys.stderr) p2D = lambda x: print(*x, sep="\n", end="\n\n", file=sys.stderr) def II(): return int(sys.stdin.readline()) def LI(): return list(map(int, sys.stdin.readline().split())) def LLI(rows_number): return [LI() for _ in range(rows_number)] def LI1(): return list(map(int1, sys.stdin.readline().split())) def LLI1(rows_number): return [LI1() for _ in range(rows_number)] def SI(): return sys.stdin.readline().rstrip() dij = [(0, 1), (-1, 0), (0, -1), (1, 0)] # dij = [(0, 1), (-1, 0), (0, -1), (1, 0), (1, 1), (1, -1), (-1, 1), (-1, -1)] # inf = -1-(-1 << 31) inf = -1-(-1 << 62) # md = 10**9+7 md = 998244353 class LCA: def __init__(self, parent, depth): n = len(parent) self._depth = depth log = max(self._depth).bit_length() self._table = [parent]+[[-1]*n for _ in range(log)] row0 = self._table[0] for lv in range(log): row1 = self._table[lv+1] for u in range(n): if row0[u] == -1: continue row1[u] = row0[row0[u]] row0 = row1 def anc(self, u, v): diff = self._depth[u]-self._depth[v] if diff < 0: u, v = v, u diff = abs(diff) u = self.up(u, diff) if u == v: return u,-1,-1 for lv in range(self._depth[u].bit_length()-1, -1, -1): anclv = self._table[lv] if anclv[u] != anclv[v]: u, v = anclv[u], anclv[v] return self._table[0][u],u,v def up(self, u, dist): lv = 0 while dist and u != -1: if dist & 1: u = self._table[lv][u] lv, dist = lv+1, dist >> 1 return u n,q=LI() to=[[] for _ in range(n)] for _ in range(n-1): u,v=LI1() to[u].append(v) to[v].append(u) def dfs(root=0): uu, stack = [], [root] while stack: u = stack.pop() uu.append(u) for v in to[u]: if v == parent[u]: continue parent[v] = u depth[v] = depth[u]+1 stack.append(v) return uu parent, depth = [-1]*n, [0]*n uu = dfs() dp=[1]*n for u in uu[:0:-1]: p=parent[u] dp[p]+=dp[u] lca=LCA(parent,depth) for _ in range(q): u,v=LI1() a,pu,pv=lca.anc(u,v) d=depth[u]+depth[v]-depth[a]*2 if d&1: print(0) elif depth[u]==depth[v]: print(n-dp[pu]-dp[pv]) else: if depth[u]>depth[v]: u,v=v,u pu,pv=pv,pu pv=lca.up(v,d//2-1) m=parent[pv] print(dp[m]-dp[pv])