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답안 #1036513

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1036513 2024-07-27T13:27:37 Z andrei_c1 Paths (RMI21_paths) C++17
68 / 100
 600 ms 22356 KB 
#pragma GCC optimize("Ofast")
#pragma GCC target("avx2")
#include <bits/stdc++.h>
using namespace std;
using ll = long long;

const int kN = 1e5;
const int kNil = -1;
const int kBuff = 1 << 16;

int pos, len;
char buf[kBuff];

int nc() {
	if(pos == len) {
		pos = 0;
		len = (int)fread(buf, 1, kBuff, stdin);
		if(!len) {
			return EOF;
		}
	}
	return buf[pos++];
}

int readint() {
	int x;
	char ch;
	while(!isdigit(ch = nc()));
	x = ch - '0';
	while(isdigit(ch = nc())) {
		x = x * 10 + ch - '0';
	}
	return x;
}

int n, k;
vector<pair<int, int>> adj[kN];
vector<int> ord;
int up[kN], val[kN], tin[kN], tout[kN];

void dfs(int u) {
	ord.emplace_back(u);
	tin[u] = ord.size() - 1;
	for(const auto &[to, c]: adj[u]) if(to != up[u]) {
		up[to] = u;
		val[to] = c;
		dfs(to);
	}
	tout[u] = ord.size() - 1;
}

struct node_t {
	ll val;
	int idx;
	node_t() : val(0), idx(0) {}
	node_t(ll val, int idx) : val(val), idx(idx) {}
	node_t operator + (const node_t &oth) const {
		if(val > oth.val) {
			return node_t(val, idx);
		} else {
			return oth;
		}
	};
};

vector<ll> mars;

struct aint {
	int n;
	vector<node_t> tree;
	vector<ll> lazy;
	aint() {}
	aint(int n) : n(n), tree(n << 2 | 1), lazy(n << 2 | 1) {}
	void build(int node, int l, int r) {
		if(l == r) {
			tree[node] = node_t(mars[l], l);
			lazy[node] = 0;
		} else {
			int mid = (l + r) >> 1;
			build(node << 1, l, mid);
			build(node << 1 | 1, mid + 1, r);
			tree[node] = tree[node << 1] + tree[node << 1 | 1];
		}
	}
	void build() {
		build(1, 0, n - 1);
	}
	void push(int node) {
		if(lazy[node]) {
			for(const auto &it: {node << 1, node << 1 | 1}) {
				tree[it].val += lazy[node];
				lazy[it] += lazy[node];
			}
			lazy[node] = 0;
		}
	}
	void update(int a, int b, int val, int node, int l, int r) {
		if(a <= l && r <= b) {
			tree[node].val += val;
			lazy[node] += val;
		} else {
			push(node);
			int mid = (l + r) >> 1;
			if(a <= mid) {
				update(a, b, val, node << 1, l, mid);
			}
			if(b > mid) {
				update(a, b, val, node << 1 | 1, mid + 1, r);
			}
			tree[node] = tree[node << 1] + tree[node << 1 | 1];
		}
	}
	void update(int a, int b, int val) {
		update(a, b, val, 1, 0, n - 1);
	}
	inline node_t all() {
		return tree[1];
	}
	void clear() {
		fill(tree.begin(), tree.end(), node_t());
		fill(lazy.begin(), lazy.end(), 0);
	}
} ds;

ll solve(int root) {
	ll res = 0;
	up[root] = kNil;
	val[root] = 0;
	dfs(root);
	for(int i = 0; i < n; i++) {
		mars[tin[i]] += val[i];
		mars[tout[i] + 1] -= val[i];
	}
	for(int i = 1; i < n; i++) {
		mars[i] += mars[i - 1];
	}
	ds.build();
	vector<bool> vis(n);
	for(int i = 0; i < k; i++) {
		auto [sum, idx] = ds.all();
		if(sum == 0) {
			break;
		}
		res += sum;
		int u = ord[idx];
		while(u != kNil && !vis[u]) {
			vis[u] = true;
			ds.update(tin[u], tout[u], -val[u]);
			u = up[u];
		}
	}
	fill(mars.begin(), mars.end(), 0);
	ds.clear();
	ord.clear();
	return res;
}

ll dist1[kN], dist2[kN];

void dfs(int u, ll dist[], int v = -1) {
	for(const auto &[to, c]: adj[u]) if(to != v) {
		dist[to] = dist[u] + c;
		dfs(to, dist, u);
	}
}

int main() {
	cin.tie(nullptr)->sync_with_stdio(false);
	n = readint();
	k = readint();
	mars = vector<ll>(n + 1);
	ds = aint(n);
	for(int i = 1; i < n; i++) {
		int u, v, c;
		u = readint() - 1;
		v = readint() - 1;
		c = readint();
		adj[u].emplace_back(v, c);
		adj[v].emplace_back(u, c);
	}
	if(k == 1) {
		dist1[0] = 0;
		dfs(0, dist1);
		int x = 0, y = 0;
		for(int i = 1; i < n; i++) {
			if(dist1[x] < dist1[i]) {
				x = i;
			}
		}
		dist2[x] = 0;
		dfs(x, dist2);
		for(int i = 1; i < n; i++) {
			if(dist2[y] < dist2[i]) {
				y = i;
			}
		}
		dist1[y] = 0;
		dfs(y, dist1);
		for(int i = 0; i < n; i++) {
			cout << max(dist1[i], dist2[i]) << '\n';
		}
	} else {
		for(int i = 0; i < n; i++) {
			cout << solve(i) << '\n';
		}
	}
	return 0;
}

Subtask #1
8.0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 2648 KB Output is correct
2 Correct 2 ms 2828 KB Output is correct

Subtask #2
11.0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 2648 KB Output is correct
2 Correct 2 ms 2828 KB Output is correct
3 Correct 4 ms 2648 KB Output is correct
4 Correct 5 ms 2648 KB Output is correct
5 Correct 4 ms 2652 KB Output is correct
6 Correct 5 ms 2848 KB Output is correct
7 Correct 5 ms 2652 KB Output is correct

Subtask #3
17.0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 2648 KB Output is correct
2 Correct 2 ms 2828 KB Output is correct
3 Correct 4 ms 2648 KB Output is correct
4 Correct 5 ms 2648 KB Output is correct
5 Correct 4 ms 2652 KB Output is correct
6 Correct 5 ms 2848 KB Output is correct
7 Correct 5 ms 2652 KB Output is correct
8 Correct 83 ms 3036 KB Output is correct
9 Correct 102 ms 2908 KB Output is correct
10 Correct 109 ms 2904 KB Output is correct
11 Correct 52 ms 2904 KB Output is correct
12 Correct 73 ms 2904 KB Output is correct

Subtask #4
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 2648 KB Output is correct
2 Correct 2 ms 2828 KB Output is correct
3 Correct 4 ms 2648 KB Output is correct
4 Correct 5 ms 2648 KB Output is correct
5 Correct 4 ms 2652 KB Output is correct
6 Correct 5 ms 2848 KB Output is correct
7 Correct 5 ms 2652 KB Output is correct
8 Correct 83 ms 3036 KB Output is correct
9 Correct 102 ms 2908 KB Output is correct
10 Correct 109 ms 2904 KB Output is correct
11 Correct 52 ms 2904 KB Output is correct
12 Correct 73 ms 2904 KB Output is correct
13 Correct 525 ms 3164 KB Output is correct
14 Correct 462 ms 3296 KB Output is correct
15 Correct 393 ms 3248 KB Output is correct
16 Correct 344 ms 3408 KB Output is correct
17 Correct 565 ms 3184 KB Output is correct
18 Correct 227 ms 3208 KB Output is correct
19 Correct 586 ms 3164 KB Output is correct

Subtask #5
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 33 ms 21544 KB Output is correct
2 Correct 40 ms 22356 KB Output is correct
3 Correct 34 ms 21076 KB Output is correct
4 Correct 31 ms 21532 KB Output is correct
5 Correct 32 ms 22056 KB Output is correct
6 Correct 29 ms 21452 KB Output is correct

Subtask #6
0 / 32.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 2648 KB Output is correct
2 Correct 2 ms 2828 KB Output is correct
3 Correct 4 ms 2648 KB Output is correct
4 Correct 5 ms 2648 KB Output is correct
5 Correct 4 ms 2652 KB Output is correct
6 Correct 5 ms 2848 KB Output is correct
7 Correct 5 ms 2652 KB Output is correct
8 Correct 83 ms 3036 KB Output is correct
9 Correct 102 ms 2908 KB Output is correct
10 Correct 109 ms 2904 KB Output is correct
11 Correct 52 ms 2904 KB Output is correct
12 Correct 73 ms 2904 KB Output is correct
13 Correct 525 ms 3164 KB Output is correct
14 Correct 462 ms 3296 KB Output is correct
15 Correct 393 ms 3248 KB Output is correct
16 Correct 344 ms 3408 KB Output is correct
17 Correct 565 ms 3184 KB Output is correct
18 Correct 227 ms 3208 KB Output is correct
19 Correct 586 ms 3164 KB Output is correct
20 Correct 33 ms 21544 KB Output is correct
21 Correct 40 ms 22356 KB Output is correct
22 Correct 34 ms 21076 KB Output is correct
23 Correct 31 ms 21532 KB Output is correct
24 Correct 32 ms 22056 KB Output is correct
25 Correct 29 ms 21452 KB Output is correct
26 Execution timed out 1045 ms 20908 KB Time limit exceeded
27 Halted 0 ms 0 KB -