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Submission #118365

# Submission time Handle Problem Language Result Execution time Memory
118365 2019-06-18T19:11:15 Z teomrn Mousetrap (CEOI17_mousetrap) C++14
100 / 100
 1041 ms 151168 KB 
#include <bits/stdc++.h>
using namespace std;

const int NMAX = 1000010;
vector <int> adia[NMAX];
int cost[NMAX];
int tata[NMAX];
int nr_op;

void dfs(int nod, int t)
{
	if (t)
		adia[nod].erase(find(adia[nod].begin(), adia[nod].end(), t));
	tata[nod] = t;

	for (auto i : adia[nod])
		dfs(i, nod);

	int max1 = 0, max2 = 0;
	for (auto i : adia[nod]) {
		if (cost[i] > max1)
			max2 = max1, max1 = cost[i];
		else if (cost[i] > max2)
			max2 = cost[i];
	}

	cost[nod] = adia[nod].size() + max2;
}


int main()
{
	ios_base::sync_with_stdio(0);
	cin.tie(0);

	//ifstream cin("q.in");


	int n, root, x;
	cin >> n >> root >> x;

	if (root == x) {
		cout << "0\n";
		return 0;
	}

	for (int i = 1; i < n; i++) {
		int a, b;
		cin >> a >> b;
		adia[a].push_back(b);
		adia[b].push_back(a);
	}

	dfs(root, 0);

	vector <int> stramosi, _sp;
	while (x != root) {
		stramosi.push_back(x);
		_sp.push_back(0);
		x = tata[x];
	}
	_sp.push_back(0);

	for (int i = stramosi.size() - 1; i >= 0; i--) {
		_sp[i] = adia[stramosi[i]].size() - (i != 0);
		_sp[i] += _sp[i + 1];
	}


	auto verif = [&](int x) -> bool {
		auto sp = _sp;

		int inert = 1, operatii = 0;
		for (int i = 0; i < stramosi.size(); i++) {
			int prv = (i ? stramosi[i - 1] : 0);

			for (auto fiu : adia[stramosi[i]]) {
				if (fiu == prv)
					continue;
				if (cost[fiu] + operatii + sp[i] >= x) {
					if (!inert)
						return 1;
					inert--;
					operatii++;
					sp[i]--;
				}
			}

			inert++;
		}
		return operatii >= x;
	};

	int ans = 0, ok = 1;
	for (int p = 1; p; p = (ok ? 2 * p : p / 2)) {
		if (verif(ans + p))
			ans += p;
		else
			ok = 0;
	}

	cout << ans << '\n';

	return 0;
}

Compilation message

mousetrap.cpp: In lambda function:
mousetrap.cpp:74:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int i = 0; i < stramosi.size(); i++) {
                   ~~^~~~~~~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 21 ms 23808 KB Output is correct
2 Correct 21 ms 23808 KB Output is correct
3 Correct 21 ms 23808 KB Output is correct
4 Correct 21 ms 23808 KB Output is correct
5 Correct 21 ms 23808 KB Output is correct
6 Correct 22 ms 23928 KB Output is correct
7 Correct 21 ms 23808 KB Output is correct
8 Correct 22 ms 23856 KB Output is correct
9 Correct 22 ms 23808 KB Output is correct
10 Correct 22 ms 23808 KB Output is correct

Subtask #2
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 362 ms 63108 KB Output is correct
2 Correct 362 ms 59312 KB Output is correct
3 Correct 955 ms 64420 KB Output is correct
4 Correct 474 ms 44376 KB Output is correct
5 Correct 1000 ms 64476 KB Output is correct
6 Correct 977 ms 64504 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 21 ms 23808 KB Output is correct
2 Correct 21 ms 23808 KB Output is correct
3 Correct 21 ms 23808 KB Output is correct
4 Correct 21 ms 23808 KB Output is correct
5 Correct 21 ms 23808 KB Output is correct
6 Correct 22 ms 23928 KB Output is correct
7 Correct 21 ms 23808 KB Output is correct
8 Correct 22 ms 23856 KB Output is correct
9 Correct 22 ms 23808 KB Output is correct
10 Correct 22 ms 23808 KB Output is correct
11 Correct 23 ms 23808 KB Output is correct
12 Correct 24 ms 23868 KB Output is correct
13 Correct 24 ms 23884 KB Output is correct
14 Correct 23 ms 23936 KB Output is correct
15 Correct 24 ms 24064 KB Output is correct
16 Correct 24 ms 23936 KB Output is correct
17 Correct 25 ms 23936 KB Output is correct
18 Correct 42 ms 23928 KB Output is correct
19 Correct 25 ms 23936 KB Output is correct
20 Correct 24 ms 23936 KB Output is correct
21 Correct 22 ms 23936 KB Output is correct
22 Correct 22 ms 23808 KB Output is correct

Subtask #4
35.0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 21 ms 23808 KB Output is correct
2 Correct 21 ms 23808 KB Output is correct
3 Correct 21 ms 23808 KB Output is correct
4 Correct 21 ms 23808 KB Output is correct
5 Correct 21 ms 23808 KB Output is correct
6 Correct 22 ms 23928 KB Output is correct
7 Correct 21 ms 23808 KB Output is correct
8 Correct 22 ms 23856 KB Output is correct
9 Correct 22 ms 23808 KB Output is correct
10 Correct 22 ms 23808 KB Output is correct
11 Correct 362 ms 63108 KB Output is correct
12 Correct 362 ms 59312 KB Output is correct
13 Correct 955 ms 64420 KB Output is correct
14 Correct 474 ms 44376 KB Output is correct
15 Correct 1000 ms 64476 KB Output is correct
16 Correct 977 ms 64504 KB Output is correct
17 Correct 23 ms 23808 KB Output is correct
18 Correct 24 ms 23868 KB Output is correct
19 Correct 24 ms 23884 KB Output is correct
20 Correct 23 ms 23936 KB Output is correct
21 Correct 24 ms 24064 KB Output is correct
22 Correct 24 ms 23936 KB Output is correct
23 Correct 25 ms 23936 KB Output is correct
24 Correct 42 ms 23928 KB Output is correct
25 Correct 25 ms 23936 KB Output is correct
26 Correct 24 ms 23936 KB Output is correct
27 Correct 22 ms 23936 KB Output is correct
28 Correct 22 ms 23808 KB Output is correct
29 Correct 23 ms 23872 KB Output is correct
30 Correct 371 ms 76344 KB Output is correct
31 Correct 358 ms 76408 KB Output is correct
32 Correct 408 ms 151168 KB Output is correct
33 Correct 384 ms 139128 KB Output is correct
34 Correct 969 ms 77304 KB Output is correct
35 Correct 984 ms 77432 KB Output is correct
36 Correct 1041 ms 84888 KB Output is correct
37 Correct 986 ms 84892 KB Output is correct
38 Correct 797 ms 88044 KB Output is correct
39 Correct 899 ms 87788 KB Output is correct
40 Correct 811 ms 87916 KB Output is correct