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ID题目提交者结果用时内存语言文件大小提交时间测评时间
#57990#4839. Smaller LCAMIT01#WA 1812ms82576kbC++172.9kb2022-10-24 07:46:412022-10-24 07:46:43

Judging History

你现在查看的是最新测评结果

  • [2023-08-10 23:21:45]
  • System Update: QOJ starts to keep a history of the judgings of all the submissions.
  • [2022-10-24 07:46:43]
  • 评测
  • 测评结果:WA
  • 用时:1812ms
  • 内存:82576kb
  • [2022-10-24 07:46:41]
  • 提交

answer

#include <bits/stdc++.h>

using namespace std;

#define REP(i, a, b) for (int i = (a), i##_end_ = (b); i < i##_end_; ++i)
#define debug(...) fprintf(stderr, __VA_ARGS__)
#define mp make_pair
#define x first
#define y second
#define pb emplace_back
#define SZ(x) (int((x).size()))
#define ALL(x) (x).begin(), (x).end()

template<typename T> inline bool chkmin(T &a, const T &b) { return b < a ? a = b, 1 : 0; }
template<typename T> inline bool chkmax(T &a, const T &b) { return a < b ? a = b, 1 : 0; }

typedef long long LL;

const int oo = 0x3f3f3f3f;

const int max0 = 19;
const int maxn = 300100;

int n;
vector<int> adj[maxn + 5];

int fa[max0][maxn + 5];

int dep[maxn + 5];

int dfs_tot = 0;
int dfn[maxn + 5];
int End[maxn + 5];

LL sum[maxn + 5];
int seq[maxn + 5];

void dfs(int x, int f = -1)
{
	seq[dfs_tot] = x;
	dfn[x] = dfs_tot++; 
	if (~f) dep[x] = dep[f] + 1;
	else dep[x] = 0;
	fa[0][x] = f;
	for (auto y : adj[x])
		if (y != f) dfs(y, x);
	End[x] = dfs_tot;
}

int lca(int x, int y)
{
	if (dep[x] > dep[y]) swap(x, y);
	for (int i = 0; dep[x] != dep[y]; ++i)
		if ((dep[y] ^ dep[x]) >> i & 1) y = fa[i][y];
	int s = max0 - 1;
	while (x != y)
	{
		for ( ; s && fa[s][x] == fa[s][y]; --s);
		x = fa[s][x];
		y = fa[s][y];
	}
	return x;
}

int cnt[maxn + 5];

int ans[maxn + 5];

vector< pair<int, int> > pairs;

int fen[maxn + 5];

inline void add(int x, int y)
{
	for (int i = x + 1; i <= n; i += i & -i)
		fen[i] += y;
}

inline int query(int x)
{
	int ret = 0;
	for (int i = x; i > 0; i -= i & -i)
		ret += fen[i];
	return ret;
}

int main()
{
#ifdef LOCAL
	freopen("input.txt", "r", stdin);
	freopen("output.txt", "w", stdout);
#endif
	scanf("%d", &n);
	REP(i, 0, n - 1)
	{
		int u, v;
		scanf("%d%d", &u, &v), --u, --v;
		adj[u].pb(v);
		adj[v].pb(u);
	}
	dfs_tot = 0;
	dfs(0);
	REP(i, 1, max0) REP(j, 0, n)
		if (~fa[i - 1][j]) fa[i][j] = fa[i - 1][fa[i - 1][j]];
		else fa[i][j] = fa[i - 1][j];
	for (int i = 1; i <= n; ++i)
		for (int j = 1; i * j <= n; ++j)
		{
			pairs.pb(mp(i - 1, j - 1));
			int tmp = lca(i - 1, j - 1);
			if ((tmp + 1) > (i + 1) * (j + 1)) ++cnt[tmp];
		}
	sort(ALL(pairs), [&](const pair<int, int> &x, const pair<int, int> &y) { return x.x * x.y < y.x * y.y; } );
	memset(fen, 0, sizeof fen);
	REP(i, 0, n)
	{
		int x = seq[i];
		sum[x] = cnt[x];
		if (~fa[0][x]) sum[x] += sum[fa[0][x]];
	}
	int tot = 0;
	REP(i, 0, n) tot += cnt[i];
	REP(i, 0, n) ans[i] = tot - sum[i];

	int cur = 1;
	for (auto u : pairs)
	{
		int x = u.x, y = u.y;
		while (cur <= (x + 1) * (y + 1))
		{
			ans[cur - 1] += query(End[cur - 1]) - query(dfn[cur - 1]);
			++cur;
		}
		add(dfn[x], 1);
		add(dfn[y], 1);
		int tmp = lca(x, y);
		add(dfn[tmp], -1);
		if (~fa[0][tmp])
			add(dfn[fa[0][tmp]], -1);
	}

	REP(i, 0, n)
		printf("%lld\n", ((LL)n * (n + 1) >> 1) - ans[i]);
	return 0;
}

详细

Test #1:

score: 100
Accepted
time: 6ms
memory: 14608kb

input:

5
1 2
4 2
2 5
3 5

output:

15
15
15
15
14

result:

ok 5 number(s): "15 15 15 15 14"

Test #2:

score: -100
Wrong Answer
time: 1812ms
memory: 82576kb

input:

300000
40632 143306
32259 40632
225153 143306
269774 225153
289668 40632
191636 269774
85717 191636
58564 191636
156509 143306
289939 40632
247103 269774
40257 40632
98149 289668
142277 143306
291616 40257
46813 225153
56324 143306
277154 142277
53903 289668
114266 32259
152231 58564
241151 152231
4...

output:

44998849142
44999702166
44999708552
44999708558
44999934208
44999717882
44999977360
44999960794
44999938640
45000022686
44999705878
45000022820
44999988314
44998965846
44999726322
44999661276
45000020134
44999981102
44999980794
45000020074
44999700756
44999981418
44999661334
44999960454
44998927688
...

result:

wrong answer 1st numbers differ - expected: '44999437117', found: '44998849142'