oj.uz

답안 #509763

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
509763 2022-01-14T09:32:54 Z daongocha Paths (RMI21_paths) C++14
0 / 100
 532 ms 24704 KB 
#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 = 1e5 + 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];

void build() {
	for (int i = n; i < 2 * n; i++) 
		st[i].second = i - n + 1, st[i].first = dep[tin[i - n + 1]];
	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 = {0, 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;

	upd(tin[u], dep[u]);

	if (sv) exist.push({u, w});
}

void reroot_down(int u, int v, int w) {
	// maximal in subtree v and out of subtree v
	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 wv, int w) {
	auto v = exist.top();
	add(v.first, -v.second, 0);

	exist.pop();
	v = exist.top();
	add(v.first, -v.second, 0);

	exist.pop();
}


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

	// reroot_down(1, 2, 5);
	// for (int i = 1; i <= n; i++) cout << dep[i] << ' '; cout << '\n';
	// reroot_down(2, 3, 3);
	// for (int i = 1; i <= n; i++) cout << dep[i] << ' '; cout << '\n';
	// reroot_up(3, 2, 3);

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

Subtask #1
0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 1 ms 2636 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 1 ms 2636 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 1 ms 2636 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 1 ms 2636 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 532 ms 24704 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 32.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 1 ms 2636 KB Output isn't correct
2 Halted 0 ms 0 KB -