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Submission #526743

# Submission time Handle Problem Language Result Execution time Memory
526743 2022-02-16T03:33:01 Z siewjh Parkovi (COCI22_parkovi) C++17
110 / 110
 1184 ms 43000 KB 
#include <iostream>
#include <vector>
#include <algorithm>
#include <set>
using namespace std;
typedef long long ll;
const int MAXN = 200'005;
const ll inf = 1e16;
vector<pair<int, ll>> adjlist[MAXN];
vector<int> ans;
pair<bool, ll> dfs(int x, int par, ll dist, ll maxdist) {
	ll over = -inf, under = 0;
	for (auto nxt : adjlist[x]) {
		int nn = nxt.first; ll nd = nxt.second;
		if (nn == par) continue;
		auto res = dfs(nn, x, nd, maxdist);
		if (res.first) over = max(over, res.second);
		else under = max(under, res.second);
	}
	if (over >= under) return { 1, over - dist };
	else if (under + dist <= maxdist) return { 0, under + dist };
	ans.push_back(x);
	return { 1, maxdist - dist };
}
int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(0); cout.tie(0);
	int nums, parks; cin >> nums >> parks;
	for (int i = 0; i < nums - 1; i++) {
		int a, b; ll w; cin >> a >> b >> w;
		adjlist[a].push_back({ b, w });
		adjlist[b].push_back({ a, w });
	}
	ll l = 0, r = inf, opt;
	while (l <= r) {
		ll m = (l + r) >> 1;
		if (m == 8) {
			cout << "";
		}
		dfs(1, -1, inf, m);
		if (ans.size() <= parks) {
			opt = m;
			r = m - 1;
		}
		else l = m + 1;
		ans.clear();
	}
	cout << opt << '\n';
	dfs(1, -1, inf, opt);
	set<int> s;
	for (auto x : ans) s.insert(x);
	for (int i = 1; ans.size() < parks; i++)
		if (!s.count(i))
			ans.push_back(i);
	for (auto x : ans) cout << x << ' ';
	return 0;
}

Compilation message

Main.cpp: In function 'int main()':
Main.cpp:41:18: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   41 |   if (ans.size() <= parks) {
      |       ~~~~~~~~~~~^~~~~~~~
Main.cpp:52:29: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   52 |  for (int i = 1; ans.size() < parks; i++)
      |                  ~~~~~~~~~~~^~~~~~~
Main.cpp:49:21: warning: 'opt' may be used uninitialized in this function [-Wmaybe-uninitialized]
   49 |  dfs(1, -1, inf, opt);
      |                     ^

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4940 KB Output is correct
2 Correct 2 ms 4940 KB Output is correct
3 Correct 3 ms 4940 KB Output is correct
4 Correct 3 ms 4940 KB Output is correct
5 Correct 3 ms 4940 KB Output is correct
6 Correct 3 ms 5008 KB Output is correct
7 Correct 3 ms 5020 KB Output is correct
8 Correct 3 ms 4940 KB Output is correct
9 Correct 3 ms 4940 KB Output is correct
10 Correct 3 ms 4940 KB Output is correct
11 Correct 3 ms 4940 KB Output is correct
12 Correct 3 ms 4940 KB Output is correct
13 Correct 3 ms 5008 KB Output is correct
14 Correct 3 ms 5012 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 264 ms 28444 KB Output is correct
2 Correct 322 ms 29688 KB Output is correct
3 Correct 240 ms 15604 KB Output is correct
4 Correct 1151 ms 15116 KB Output is correct
5 Correct 891 ms 14808 KB Output is correct
6 Correct 1039 ms 14800 KB Output is correct
7 Correct 881 ms 14892 KB Output is correct
8 Correct 1055 ms 15388 KB Output is correct
9 Correct 951 ms 14628 KB Output is correct
10 Correct 1046 ms 15368 KB Output is correct
11 Correct 668 ms 16320 KB Output is correct
12 Correct 754 ms 16608 KB Output is correct
13 Correct 733 ms 17564 KB Output is correct
14 Correct 653 ms 16400 KB Output is correct
15 Correct 659 ms 16076 KB Output is correct
16 Correct 691 ms 16524 KB Output is correct
17 Correct 607 ms 15976 KB Output is correct

Subtask #3
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 353 ms 29540 KB Output is correct
2 Correct 309 ms 28984 KB Output is correct
3 Correct 284 ms 27768 KB Output is correct
4 Correct 262 ms 27588 KB Output is correct
5 Correct 420 ms 43000 KB Output is correct
6 Correct 337 ms 38024 KB Output is correct
7 Correct 386 ms 39960 KB Output is correct
8 Correct 303 ms 33160 KB Output is correct
9 Correct 333 ms 32928 KB Output is correct
10 Correct 290 ms 30312 KB Output is correct
11 Correct 275 ms 28104 KB Output is correct
12 Correct 406 ms 40252 KB Output is correct
13 Correct 370 ms 37652 KB Output is correct
14 Correct 350 ms 34332 KB Output is correct
15 Correct 267 ms 28980 KB Output is correct
16 Correct 293 ms 27984 KB Output is correct
17 Correct 269 ms 27892 KB Output is correct
18 Correct 272 ms 29036 KB Output is correct
19 Correct 349 ms 37728 KB Output is correct
20 Correct 307 ms 36372 KB Output is correct
21 Correct 302 ms 34064 KB Output is correct

Subtask #4
60.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4940 KB Output is correct
2 Correct 2 ms 4940 KB Output is correct
3 Correct 3 ms 4940 KB Output is correct
4 Correct 3 ms 4940 KB Output is correct
5 Correct 3 ms 4940 KB Output is correct
6 Correct 3 ms 5008 KB Output is correct
7 Correct 3 ms 5020 KB Output is correct
8 Correct 3 ms 4940 KB Output is correct
9 Correct 3 ms 4940 KB Output is correct
10 Correct 3 ms 4940 KB Output is correct
11 Correct 3 ms 4940 KB Output is correct
12 Correct 3 ms 4940 KB Output is correct
13 Correct 3 ms 5008 KB Output is correct
14 Correct 3 ms 5012 KB Output is correct
15 Correct 264 ms 28444 KB Output is correct
16 Correct 322 ms 29688 KB Output is correct
17 Correct 240 ms 15604 KB Output is correct
18 Correct 1151 ms 15116 KB Output is correct
19 Correct 891 ms 14808 KB Output is correct
20 Correct 1039 ms 14800 KB Output is correct
21 Correct 881 ms 14892 KB Output is correct
22 Correct 1055 ms 15388 KB Output is correct
23 Correct 951 ms 14628 KB Output is correct
24 Correct 1046 ms 15368 KB Output is correct
25 Correct 668 ms 16320 KB Output is correct
26 Correct 754 ms 16608 KB Output is correct
27 Correct 733 ms 17564 KB Output is correct
28 Correct 653 ms 16400 KB Output is correct
29 Correct 659 ms 16076 KB Output is correct
30 Correct 691 ms 16524 KB Output is correct
31 Correct 607 ms 15976 KB Output is correct
32 Correct 353 ms 29540 KB Output is correct
33 Correct 309 ms 28984 KB Output is correct
34 Correct 284 ms 27768 KB Output is correct
35 Correct 262 ms 27588 KB Output is correct
36 Correct 420 ms 43000 KB Output is correct
37 Correct 337 ms 38024 KB Output is correct
38 Correct 386 ms 39960 KB Output is correct
39 Correct 303 ms 33160 KB Output is correct
40 Correct 333 ms 32928 KB Output is correct
41 Correct 290 ms 30312 KB Output is correct
42 Correct 275 ms 28104 KB Output is correct
43 Correct 406 ms 40252 KB Output is correct
44 Correct 370 ms 37652 KB Output is correct
45 Correct 350 ms 34332 KB Output is correct
46 Correct 267 ms 28980 KB Output is correct
47 Correct 293 ms 27984 KB Output is correct
48 Correct 269 ms 27892 KB Output is correct
49 Correct 272 ms 29036 KB Output is correct
50 Correct 349 ms 37728 KB Output is correct
51 Correct 307 ms 36372 KB Output is correct
52 Correct 302 ms 34064 KB Output is correct
53 Correct 990 ms 14524 KB Output is correct
54 Correct 1073 ms 14812 KB Output is correct
55 Correct 1143 ms 15216 KB Output is correct
56 Correct 1071 ms 15580 KB Output is correct
57 Correct 1098 ms 19252 KB Output is correct
58 Correct 964 ms 14612 KB Output is correct
59 Correct 1085 ms 26128 KB Output is correct
60 Correct 1030 ms 15208 KB Output is correct
61 Correct 1024 ms 14292 KB Output is correct
62 Correct 884 ms 19752 KB Output is correct
63 Correct 1058 ms 15244 KB Output is correct
64 Correct 1081 ms 24820 KB Output is correct
65 Correct 1101 ms 15060 KB Output is correct
66 Correct 945 ms 19772 KB Output is correct
67 Correct 906 ms 14360 KB Output is correct
68 Correct 1184 ms 26128 KB Output is correct
69 Correct 344 ms 29052 KB Output is correct
70 Correct 267 ms 27812 KB Output is correct
71 Correct 354 ms 34868 KB Output is correct
72 Correct 297 ms 14568 KB Output is correct
73 Correct 241 ms 14584 KB Output is correct
74 Correct 292 ms 19908 KB Output is correct
75 Correct 678 ms 16336 KB Output is correct
76 Correct 703 ms 16796 KB Output is correct
77 Correct 634 ms 16240 KB Output is correct
78 Correct 626 ms 18336 KB Output is correct