#include <bits/stdc++.h>
#define all(a) begin(a), end(a)
#define S second
#define F first
using namespace std;
int const N = 2000005;
void countsort(vector<int> &v) {
array<bool, N> tmp{};
for (auto a : v) {
assert(a < N);
tmp[a] = true;
}
v.clear();
for (int i = 0; i < N; ++i) {
if (tmp[i]) {
v.push_back(i);
}
}
}
void cs2(vector<int> &v) {
array<int, N> tmp{};
for (auto a : v) {
assert(a < N);
tmp[a]++;
}
v.clear();
for (int i = N - 1; i > 0; --i) {
while (tmp[i] > 0) {
v.push_back(i);
tmp[i]--;
}
}
}
void cc(vector<pair<int, int>> &v) {
vector<int> tmp;
tmp.reserve(v.size());
for (auto &[a, b] : v) {
tmp.push_back(a);
tmp.push_back(b);
}
countsort(tmp);
for (auto &[a, b] : v) {
a = lower_bound(all(tmp), a) - begin(tmp);
b = lower_bound(all(tmp), b) - begin(tmp);
}
}
void countsort(vector<pair<int, int>> &v) {
array<int, N> tmp{};
tmp.fill(-1);
for (auto &[a, b] : v) {
assert(a < N);
tmp[a] = b;
}
v.clear();
for (int i = 0; i < N; ++i) {
if (tmp[i] != -1) {
v.emplace_back(i, tmp[i]);
}
}
}
vector<bool> bio;
vector<int> len;
vector<int> nxt;
int l, tar;
void findcyc(int ver) {
bio[ver] = true;
if (ver == tar) {
len.push_back(l);
return;
}
++l;
findcyc(nxt[ver]);
}
void solve() {
int n, m;
cin >> n >> m;
bio.resize(2 * n);
nxt.resize(2 * n);
len.reserve(n);
vector<pair<int, int>> v;
v.reserve(2 * n);
for (int i = 0; i < n; ++i) {
int a, b;
cin >> a >> b;
v.emplace_back(a, b);
v.emplace_back(b, a);
}
countsort(v);
cc(v);
for (int i = 0; i < 2 * n; ++i) {
nxt[i] = (v[i].S + 1) % (2 * n);
}
v.clear();
v.shrink_to_fit();
for (int i = 0; i < 2 * n; ++i) {
if (!bio[nxt[i]]) {
l = 1;
tar = i;
findcyc(nxt[i]);
}
}
bio.clear();
bio.shrink_to_fit();
nxt.clear();
nxt.shrink_to_fit();
int ans = len[0];
len[0] = 0;
cs2(len);
int i = 0;
for (; i < m && i < len.size(); ++i) {
if (len[i] > 0) {
ans += len[i] + 2;
} else break;
}
int lft = m - 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:117:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
117 | for (; i < m && i < len.size(); ++i) {
| ~~^~~~~~~~~~~~
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
22 ms |
8012 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
21 ms |
8136 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
23 ms |
8136 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
22 ms |
8128 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
23 ms |
8124 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
22 ms |
8136 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
23 ms |
8136 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
23 ms |
8140 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
22 ms |
8012 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
23 ms |
8140 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
23 ms |
8156 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
24 ms |
8268 KB |
Output is correct |
2 |
Correct |
27 ms |
8524 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
24 ms |
8268 KB |
Output is correct |
2 |
Correct |
30 ms |
8716 KB |
Output is correct |
3 |
Correct |
36 ms |
9312 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
29 ms |
8652 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
32 ms |
8780 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
101 ms |
13072 KB |
Output is correct |
2 |
Correct |
236 ms |
19912 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
156 ms |
16424 KB |
Output is correct |
2 |
Correct |
341 ms |
25740 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
398 ms |
32680 KB |
Output is correct |
2 |
Correct |
474 ms |
37676 KB |
Output is correct |
3 |
Correct |
437 ms |
40524 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
658 ms |
42736 KB |
Output is correct |
2 |
Correct |
653 ms |
45548 KB |
Output is correct |
3 |
Correct |
529 ms |
61416 KB |
Output is correct |
4 |
Correct |
535 ms |
62076 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
664 ms |
47608 KB |
Output is correct |
2 |
Correct |
649 ms |
47492 KB |
Output is correct |
3 |
Correct |
584 ms |
47556 KB |
Output is correct |
4 |
Correct |
543 ms |
47640 KB |
Output is correct |