oj.uz

Submission #442878

# Submission time Handle Problem Language Result Execution time Memory
442878 2021-07-09T10:15:29 Z jesus_coconut Teleporters (IOI08_teleporters) C++17
90 / 100
 1000 ms 64416 KB 
#include <bits/stdc++.h>
#define all(a) begin(a), end(a)
#define S second
#define F first
using namespace std;

void cc(vector<pair<int, int>> &v) {
	vector<int> tmp;
	for (auto &[a, b] : v) {
		tmp.push_back(a);
		tmp.push_back(b);
	}
	sort(all(tmp));
	tmp.erase(unique(all(tmp)), end(tmp));
	for (auto &[a, b] : v) {
		a = lower_bound(all(tmp), a) - begin(tmp);
		b = lower_bound(all(tmp), b) - begin(tmp);
	}
}

int const N = 1000005;

vector<bool> bio;
vector<int> len;
vector<int> nxt;
void findcyc(int ver, int l, int tar) {
	bio[ver] = true;
	if (ver == tar) {
		len.push_back(l);
		return;
	}
	findcyc(nxt[ver], l + 1, tar);
}

void solve() {
	int n, m;
	cin >> n >> m;
	bio.resize(2 * n);
	nxt.resize(2 * n);
	vector<pair<int, int>> v;
	for (int i = 0; i < n; ++i) {
		int a, b;
		cin >> a >> b;
		v.emplace_back(a, b);
		v.emplace_back(b, a);
	}
	sort(all(v));
	cc(v);
	for (int i = 0; i < 2 * n; ++i) {
		nxt[i] = (v[i].S + 1) % (2 * n);
	}
	for (int i = 0; i < 2 * n; ++i) {
		if (!bio[nxt[i]]) {
			findcyc(nxt[i], 1, i);
		}
	}
	sort(begin(len) + 1, end(len), greater<>());
	int ans = len[0];
	int i = 1;
	for (; i <= m && i < len.size(); ++i) {
		if (len[i] > 0) {
			ans += len[i] + 2;
		} else break;
	}
	int lft = m + 1 - i;
	if (lft % 2 == 1) {
		lft--;
		ans++;
	}
	ans += 2 * lft;
	cout << ans << '\n';
}

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

	solve();

	return 0;
}

Compilation message

teleporters.cpp: In function 'void solve()':
teleporters.cpp:60:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   60 |  for (; i <= m && i < len.size(); ++i) {
      |                   ~~^~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct

Subtask #2
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct

Subtask #3
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct

Subtask #4
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct

Subtask #5
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct

Subtask #6
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct

Subtask #7
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct

Subtask #8
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct

Subtask #9
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct

Subtask #10
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct

Subtask #11
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct

Subtask #12
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 460 KB Output is correct
2 Correct 9 ms 844 KB Output is correct

Subtask #13
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 588 KB Output is correct
2 Correct 10 ms 968 KB Output is correct
3 Correct 23 ms 2964 KB Output is correct

Subtask #14
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 1272 KB Output is correct

Subtask #15
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 1484 KB Output is correct

Subtask #16
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 118 ms 6660 KB Output is correct
2 Correct 357 ms 19716 KB Output is correct

Subtask #17
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 238 ms 11468 KB Output is correct
2 Correct 501 ms 23352 KB Output is correct

Subtask #18
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 593 ms 39656 KB Output is correct
2 Correct 735 ms 53524 KB Output is correct
3 Correct 704 ms 64416 KB Output is correct

Subtask #19
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 962 ms 45744 KB Output is correct
2 Execution timed out 1057 ms 61248 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #20
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1052 ms 48596 KB Time limit exceeded
2 Halted 0 ms 0 KB -