oj.uz

답안 #509803

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
509803 2022-01-14T10:11:21 Z daongocha Paths (RMI21_paths) C++14
68 / 100
 600 ms 30268 KB 
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("avx,avx2,fma")

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;

// #define map dsfakuhwkl34hdfs
#define int long long

#define fileopen(a, b) freopen(((std::string)a + ".inp").c_str(), "r", stdin); freopen(((std::string)b + ".out").c_str(), "w", stdout);
#define fileopen1(a) freopen(((std::string)a + ".inp").c_str(), "r", stdin); freopen(((std::string)a + ".out").c_str(), "w", stdout);
 
using namespace std;

const int MAXN = 3e5 + 5;

#define ordered_set tree<pair<int, int>, null_type,less<pair<int, int>>, rb_tree_tag,tree_order_statistics_node_update>

vector<pair<int, int>> adj[MAXN];
pair<int, int> st[MAXN << 1];
int n, k;
int dep[MAXN];
int tin[MAXN], tout[MAXN];
int ver[MAXN];

void build() {
	for (int i = 1; i <= n; i++) {
		st[tin[i] + n - 1] = {dep[i], i};
	} 
	for (int i = n - 1; i >= 1; i--) st[i] = max(st[i << 1], st[i << 1 | 1]);
}

void upd(int i, int val) {
	i += n - 1;
	for (st[i].first = val; i > 1; i >>= 1)
		st[i >> 1] = max(st[i], st[i ^ 1]);
}

pair<int, int> query(int l, int r) {
	l += n - 1;
	r += n;
	pair<int, int> ans = {-1, 0};
	for (; l < r; l >>= 1, r >>= 1) {
		if (l & 1) ans = max(ans, st[l++]);
		if (r & 1) ans = max(ans, st[--r]);
	}
	return ans;
}

int par[MAXN];
int num[MAXN];
bool vis[MAXN];

int update(int u) {
	int ans = 0;
	for (; !vis[u]; u = par[u]) {
		ans += num[u];
		vis[u] = 1;
	}
	return ans;
}


void dfs(int u, int pre = 0) {
	static int timer = 0;

	tin[u] = ++timer;

	par[u] = pre;
	for (auto vw: adj[u]) {
		int v = vw.first, w = vw.second;
		if (v != pre) {
			dep[v] = dep[u] + w;
			num[v] = w;
			dfs(v, u);
		}
	}

	tout[u] = timer;
}

ordered_set pp;
int ans = 0;

stack<pair<int, int>> exist;

void add(int u, int w, bool sv) {
	int v = pp.order_of_key({-dep[u], u});
	pp.erase({-dep[u], u}); 
	auto it = *(pp.find_by_order(k - 1));
	if (v < k) {
		ans -= dep[u];
		ans -= it.first;
	}
	
	dep[u] += w;
	pp.insert({-dep[u], u});
	
	v = pp.order_of_key({-dep[u], u});
	if (v < k) {
		ans += dep[u];
		ans += it.first;
	}

	ans = 0;
	for (int i = 0; i < k; i++) ans -= pp.find_by_order(i)->first;

	// cout << tin[u] << ' ' << dep[u] << " owo\n";
	upd(tin[u], dep[u]);
}

void reroot_down(int u, int v, int w) {
	// maximal in subtree v and out of subtree v
	// for (int i = 1; i <= n; i++) cout << dep[tin[i]] << ' '; cout << '\n';

	auto it1 = query(tin[v], tout[v]); 
	auto it2 = max(query(1, tin[v] - 1), query(tout[v] + 1, n));

	add(it1.second, -w, 1);
	add(it2.second, w, 1);
}

void reroot_up(int u, int v, int w) {
	swap(u, v);
	auto it1 = query(tin[v], tout[v]);
	auto it2 = max(query(1, tin[v] - 1), query(tout[v] + 1, n));

	// cout << v << '\n';
	// cout << 1 << ' ' << tin[v] - 1 << ' ' << tout[v] + 1 << ' ' << n << '\n';

	add(it1.second, w, 1);
	add(it2.second, -w, 1);
}


int res[MAXN];

void dfs2(int u, int pre = 0) {
	for (auto vw: adj[u]) {
		int v = vw.first, w = vw.second;
		if (v != pre) {
			reroot_down(u, v, w);
			res[v] = ans;
			dfs2(v, u);
			// cout << v << '\n';
			reroot_up(v, u, w);
		}
	}
}

signed main() {
	#ifndef PICHU_LOCAL_DEF
		//fileopen1("LAH");
	#endif

	cin.tie(0)->sync_with_stdio(0);

	cin >> n >> k;

	for (int i = 1, u, v, w; i < n; i++) {
		cin >> u >> v >> w;
		adj[u].push_back({v, w});
		adj[v].push_back({u, w});
	} 

	vis[0] = 1;

	dfs(1);

	#define pq dsaflkdfssdfdfs
	vector<pair<int, int>> pq;
	for (int i = 1; i <= n; i++) 
		pq.push_back({dep[i], i});

	sort(pq.rbegin(), pq.rend());

	for (int i = 0; i < n; i++) {
		int u = pq[i].second;
		dep[u] = update(u);
	}

	#undef pq

	build();

	for (int i = 1; i <= n; i++) pp.insert({-dep[i], i});	

	pp.insert({100, 0});
	
	for (int i = 0; i < k; i++) ans += pp.find_by_order(i)->first;
	ans = -ans;

	res[1] = ans;
		
	// for (int i = 1; i <= n; i++) cout << tin[i] << ' '; cout << '\n';

	dfs2(1);
	
	// for (int i = 1; i <= n; i++) cout << dep[i] << ' '; cout << '\n';
	// reroot_down(1, 5, 1);
	// for (int i = 1; i <= n; i++) cout << dep[i] << ' '; cout << '\n';
	// // reroot_up(5, 1, 1);
	// for (int i = 1; i <= n; i++) cout << dep[i] << ' '; cout << '\n';

	for (int i = 1; i <= n; i++) cout << res[i] << '\n';
}

Subtask #1
8.0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 7372 KB Output is correct
2 Correct 5 ms 7372 KB Output is correct

Subtask #2
11.0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 7372 KB Output is correct
2 Correct 5 ms 7372 KB Output is correct
3 Correct 5 ms 7452 KB Output is correct
4 Correct 5 ms 7372 KB Output is correct
5 Correct 8 ms 7372 KB Output is correct
6 Correct 5 ms 7372 KB Output is correct
7 Correct 6 ms 7372 KB Output is correct

Subtask #3
17.0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 7372 KB Output is correct
2 Correct 5 ms 7372 KB Output is correct
3 Correct 5 ms 7452 KB Output is correct
4 Correct 5 ms 7372 KB Output is correct
5 Correct 8 ms 7372 KB Output is correct
6 Correct 5 ms 7372 KB Output is correct
7 Correct 6 ms 7372 KB Output is correct
8 Correct 16 ms 7628 KB Output is correct
9 Correct 11 ms 7648 KB Output is correct
10 Correct 10 ms 7636 KB Output is correct
11 Correct 15 ms 7628 KB Output is correct
12 Correct 14 ms 7660 KB Output is correct

Subtask #4
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 7372 KB Output is correct
2 Correct 5 ms 7372 KB Output is correct
3 Correct 5 ms 7452 KB Output is correct
4 Correct 5 ms 7372 KB Output is correct
5 Correct 8 ms 7372 KB Output is correct
6 Correct 5 ms 7372 KB Output is correct
7 Correct 6 ms 7372 KB Output is correct
8 Correct 16 ms 7628 KB Output is correct
9 Correct 11 ms 7648 KB Output is correct
10 Correct 10 ms 7636 KB Output is correct
11 Correct 15 ms 7628 KB Output is correct
12 Correct 14 ms 7660 KB Output is correct
13 Correct 205 ms 7820 KB Output is correct
14 Correct 38 ms 7844 KB Output is correct
15 Correct 16 ms 7852 KB Output is correct
16 Correct 174 ms 7816 KB Output is correct
17 Correct 90 ms 7816 KB Output is correct
18 Correct 41 ms 7732 KB Output is correct
19 Correct 299 ms 7816 KB Output is correct

Subtask #5
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 478 ms 29324 KB Output is correct
2 Correct 503 ms 30268 KB Output is correct
3 Correct 391 ms 29396 KB Output is correct
4 Correct 565 ms 29236 KB Output is correct
5 Correct 510 ms 29792 KB Output is correct
6 Correct 529 ms 29128 KB Output is correct

Subtask #6
0 / 32.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 7372 KB Output is correct
2 Correct 5 ms 7372 KB Output is correct
3 Correct 5 ms 7452 KB Output is correct
4 Correct 5 ms 7372 KB Output is correct
5 Correct 8 ms 7372 KB Output is correct
6 Correct 5 ms 7372 KB Output is correct
7 Correct 6 ms 7372 KB Output is correct
8 Correct 16 ms 7628 KB Output is correct
9 Correct 11 ms 7648 KB Output is correct
10 Correct 10 ms 7636 KB Output is correct
11 Correct 15 ms 7628 KB Output is correct
12 Correct 14 ms 7660 KB Output is correct
13 Correct 205 ms 7820 KB Output is correct
14 Correct 38 ms 7844 KB Output is correct
15 Correct 16 ms 7852 KB Output is correct
16 Correct 174 ms 7816 KB Output is correct
17 Correct 90 ms 7816 KB Output is correct
18 Correct 41 ms 7732 KB Output is correct
19 Correct 299 ms 7816 KB Output is correct
20 Correct 478 ms 29324 KB Output is correct
21 Correct 503 ms 30268 KB Output is correct
22 Correct 391 ms 29396 KB Output is correct
23 Correct 565 ms 29236 KB Output is correct
24 Correct 510 ms 29792 KB Output is correct
25 Correct 529 ms 29128 KB Output is correct
26 Execution timed out 1080 ms 27860 KB Time limit exceeded
27 Halted 0 ms 0 KB -