#include <iostream>
#include <algorithm>
#include <bitset>
#define pii pair<int, int>
#define fst first
#define snd second
using namespace std;
const int MX = 2000000;
int N, K, res = 0;
int nex[2000005];
pii A[2000005];
bitset<2000005> vis;
vector<int> cyc;
int main()
{
ios :: sync_with_stdio(0); cin.tie(0); cout.tie(0);
cin >> N >> K;
for (int i = 0; i < N; i++)
{
cin >> A[2 * i].fst >> A[2 * i].snd;
A[2 * i + 1] = {A[2 * i].snd, A[2 * i].fst};
}
A[2 * N] = {0, 0}; A[2 * N + 1] = {MX + 1, -1};
sort(A, A + 2 * N + 1);
for (int i = 0; i < 2 * N + 2; i++)
{
if (A[i].snd != -1) nex[i] = upper_bound(A, A + 2 * N + 1, make_pair(A[i].snd, MX + 1)) - A;
else nex[i] = -1;
}
int u = 0;
while (u != -1) {res++; vis[u] = 1; u = nex[u];}
for (int i = 1; i < 2 * N + 1; i++)
{
if (!vis[i])
{
u = i; int s = 0;
while (!vis[u]) {vis[u] = 1; u = nex[u]; s++;}
cyc.push_back(s);
}
}
sort(cyc.begin(), cyc.end(), greater<int>());
for (int i = 0; i < cyc.size() && i < K; i++) res += cyc[i];
cout << res + 2 * K - 2 << "\n";
return 0;
}
Compilation message
teleporters.cpp:16:1: error: 'vector' does not name a type
16 | vector<int> cyc;
| ^~~~~~
teleporters.cpp: In function 'int main()':
teleporters.cpp:45:4: error: 'cyc' was not declared in this scope
45 | cyc.push_back(s);
| ^~~
teleporters.cpp:49:7: error: 'cyc' was not declared in this scope
49 | sort(cyc.begin(), cyc.end(), greater<int>());
| ^~~
