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Submission #855218

# Submission time Handle Problem Language Result Execution time Memory
855218 2023-09-30T20:52:16 Z serifefedartar Parkovi (COCI22_parkovi) C++17
110 / 110
 997 ms 53792 KB 
#include <bits/stdc++.h>
using namespace std;
 
#define fast ios::sync_with_stdio(0);cin.tie(0);
#define s second
#define f first
typedef long long ll;
const ll MOD = 998244353;
const ll LOGN = 18; 
const ll MAXN = 2e5 + 5;

ll n, k, q;
vector<vector<pair<int,ll>>> graph;
vector<int> parks, ans_parks;
ll nearest[MAXN], longest[MAXN];

void dfs(int node, int parent) {
	for (auto u : graph[node]) {
		if (u.f == parent)
			continue;
		dfs(u.f, node);

		nearest[node] = min(nearest[node], nearest[u.f] + u.s);
		if (longest[u.f] + u.s <= q) // bir üste aktarabilme durumu
			longest[node] = max(longest[node], longest[u.f] + u.s);
		else {
			parks.push_back(u.f);
			nearest[node] = min(nearest[node], u.s);
		}
	}

	if (nearest[node] + longest[node] <= q)
		longest[node] = -1e15; 
}

bool check(ll x) {
	for (int i = 0; i < MAXN; i++)
		nearest[i] = 1e15, longest[i] = 0;
	parks.clear();

	q = x;
	dfs(1, 1);
	if (longest[1] + nearest[1] > x)
		parks.push_back(1);

	return (parks.size() <= k);
}

int main() {
	fast
	cin >> n >> k;

	graph = vector<vector<pair<int,ll>>>(n+1, vector<pair<int,ll>>());
	for (int i = 1; i < n; i++) {
		ll a, b, w;
		cin >> a >> b >> w;
		graph[a].push_back({b, w});
		graph[b].push_back({a, w});
	}

	ll L = 0;
	ll R = 1e15;
	ll ans = -1;
	while (R >= L) {
		ll mid = L + (R-L)/2;
		if (check(mid)) {
			R = mid - 1;
			ans = mid;
			ans_parks = parks;
		} else
			L = mid + 1;
	}
	
	cout << ans << "\n";
	set<int> st;
	for (auto u : ans_parks)
		st.insert(u);
	int rem = k - st.size();
	for (int i = 1; i <= n && rem; i++) {
		if (st.count(i) == 0) {
			st.insert(i);
			rem--;
		}
	}

	for (auto u : st)
		cout << u << " ";
	cout << "\n";
}

Compilation message

Main.cpp: In function 'bool check(ll)':
Main.cpp:46:23: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'll' {aka 'long long int'} [-Wsign-compare]
   46 |  return (parks.size() <= k);
      |          ~~~~~~~~~~~~~^~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 3416 KB Output is correct
2 Correct 9 ms 3936 KB Output is correct
3 Correct 5 ms 3416 KB Output is correct
4 Correct 5 ms 3420 KB Output is correct
5 Correct 6 ms 3420 KB Output is correct
6 Correct 5 ms 3420 KB Output is correct
7 Correct 6 ms 3420 KB Output is correct
8 Correct 6 ms 3420 KB Output is correct
9 Correct 5 ms 3544 KB Output is correct
10 Correct 5 ms 3672 KB Output is correct
11 Correct 5 ms 3540 KB Output is correct
12 Correct 5 ms 3540 KB Output is correct
13 Correct 6 ms 3420 KB Output is correct
14 Correct 6 ms 3420 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 343 ms 37208 KB Output is correct
2 Correct 358 ms 42336 KB Output is correct
3 Correct 301 ms 21948 KB Output is correct
4 Correct 859 ms 21660 KB Output is correct
5 Correct 654 ms 21076 KB Output is correct
6 Correct 833 ms 20980 KB Output is correct
7 Correct 769 ms 19804 KB Output is correct
8 Correct 817 ms 20904 KB Output is correct
9 Correct 831 ms 21076 KB Output is correct
10 Correct 941 ms 21332 KB Output is correct
11 Correct 668 ms 23668 KB Output is correct
12 Correct 604 ms 23632 KB Output is correct
13 Correct 774 ms 25332 KB Output is correct
14 Correct 595 ms 22316 KB Output is correct
15 Correct 682 ms 21332 KB Output is correct
16 Correct 646 ms 23008 KB Output is correct
17 Correct 661 ms 22212 KB Output is correct

Subtask #3
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 406 ms 38872 KB Output is correct
2 Correct 346 ms 42000 KB Output is correct
3 Correct 328 ms 40020 KB Output is correct
4 Correct 341 ms 40272 KB Output is correct
5 Correct 440 ms 52808 KB Output is correct
6 Correct 431 ms 47468 KB Output is correct
7 Correct 470 ms 50016 KB Output is correct
8 Correct 426 ms 42568 KB Output is correct
9 Correct 358 ms 42324 KB Output is correct
10 Correct 406 ms 41620 KB Output is correct
11 Correct 380 ms 40020 KB Output is correct
12 Correct 453 ms 53792 KB Output is correct
13 Correct 427 ms 51352 KB Output is correct
14 Correct 411 ms 47444 KB Output is correct
15 Correct 335 ms 40788 KB Output is correct
16 Correct 375 ms 39248 KB Output is correct
17 Correct 334 ms 38996 KB Output is correct
18 Correct 413 ms 41524 KB Output is correct
19 Correct 406 ms 50040 KB Output is correct
20 Correct 379 ms 48724 KB Output is correct
21 Correct 368 ms 46296 KB Output is correct

Subtask #4
60.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 3416 KB Output is correct
2 Correct 9 ms 3936 KB Output is correct
3 Correct 5 ms 3416 KB Output is correct
4 Correct 5 ms 3420 KB Output is correct
5 Correct 6 ms 3420 KB Output is correct
6 Correct 5 ms 3420 KB Output is correct
7 Correct 6 ms 3420 KB Output is correct
8 Correct 6 ms 3420 KB Output is correct
9 Correct 5 ms 3544 KB Output is correct
10 Correct 5 ms 3672 KB Output is correct
11 Correct 5 ms 3540 KB Output is correct
12 Correct 5 ms 3540 KB Output is correct
13 Correct 6 ms 3420 KB Output is correct
14 Correct 6 ms 3420 KB Output is correct
15 Correct 343 ms 37208 KB Output is correct
16 Correct 358 ms 42336 KB Output is correct
17 Correct 301 ms 21948 KB Output is correct
18 Correct 859 ms 21660 KB Output is correct
19 Correct 654 ms 21076 KB Output is correct
20 Correct 833 ms 20980 KB Output is correct
21 Correct 769 ms 19804 KB Output is correct
22 Correct 817 ms 20904 KB Output is correct
23 Correct 831 ms 21076 KB Output is correct
24 Correct 941 ms 21332 KB Output is correct
25 Correct 668 ms 23668 KB Output is correct
26 Correct 604 ms 23632 KB Output is correct
27 Correct 774 ms 25332 KB Output is correct
28 Correct 595 ms 22316 KB Output is correct
29 Correct 682 ms 21332 KB Output is correct
30 Correct 646 ms 23008 KB Output is correct
31 Correct 661 ms 22212 KB Output is correct
32 Correct 406 ms 38872 KB Output is correct
33 Correct 346 ms 42000 KB Output is correct
34 Correct 328 ms 40020 KB Output is correct
35 Correct 341 ms 40272 KB Output is correct
36 Correct 440 ms 52808 KB Output is correct
37 Correct 431 ms 47468 KB Output is correct
38 Correct 470 ms 50016 KB Output is correct
39 Correct 426 ms 42568 KB Output is correct
40 Correct 358 ms 42324 KB Output is correct
41 Correct 406 ms 41620 KB Output is correct
42 Correct 380 ms 40020 KB Output is correct
43 Correct 453 ms 53792 KB Output is correct
44 Correct 427 ms 51352 KB Output is correct
45 Correct 411 ms 47444 KB Output is correct
46 Correct 335 ms 40788 KB Output is correct
47 Correct 375 ms 39248 KB Output is correct
48 Correct 334 ms 38996 KB Output is correct
49 Correct 413 ms 41524 KB Output is correct
50 Correct 406 ms 50040 KB Output is correct
51 Correct 379 ms 48724 KB Output is correct
52 Correct 368 ms 46296 KB Output is correct
53 Correct 789 ms 21356 KB Output is correct
54 Correct 755 ms 22356 KB Output is correct
55 Correct 818 ms 22944 KB Output is correct
56 Correct 717 ms 23120 KB Output is correct
57 Correct 931 ms 27032 KB Output is correct
58 Correct 704 ms 21764 KB Output is correct
59 Correct 865 ms 34196 KB Output is correct
60 Correct 804 ms 21456 KB Output is correct
61 Correct 644 ms 19796 KB Output is correct
62 Correct 653 ms 25524 KB Output is correct
63 Correct 872 ms 21372 KB Output is correct
64 Correct 801 ms 31660 KB Output is correct
65 Correct 737 ms 21720 KB Output is correct
66 Correct 767 ms 26580 KB Output is correct
67 Correct 597 ms 20560 KB Output is correct
68 Correct 997 ms 33784 KB Output is correct
69 Correct 356 ms 42580 KB Output is correct
70 Correct 330 ms 39760 KB Output is correct
71 Correct 410 ms 48636 KB Output is correct
72 Correct 198 ms 21564 KB Output is correct
73 Correct 250 ms 21188 KB Output is correct
74 Correct 264 ms 27748 KB Output is correct
75 Correct 591 ms 24148 KB Output is correct
76 Correct 682 ms 23636 KB Output is correct
77 Correct 572 ms 23376 KB Output is correct
78 Correct 639 ms 24988 KB Output is correct