Submission #274625

#	Time	Username	Problem	Language	Result	Execution time	Memory
274625		evpipis	Teleporters (IOI08_teleporters)	C++11	100 / 100	759 ms	54376 KiB

teleporters

#include <bits/stdc++.h>
using namespace std;

#define fi first
#define se second
#define mp make_pair
#define pb push_back
typedef pair<int, int> ii;

const int len = 2e6+5;
int vis[len], nex[len];
vector<ii> vec;
priority_queue<int> pq;

int dfs(int u){
    vis[u] = 1;

    int ans = 1;
    if (!vis[nex[u]])
        ans += dfs(nex[u]);

    return ans;
}

int main(){
    int n, m;
    scanf("%d %d", &n, &m);
    for (int i = 0; i < n; i++){
        int a, b;
        scanf("%d %d", &a, &b);
        vec.pb(mp(a, 2*i));
        vec.pb(mp(b, 2*i+1));
    }

    sort(vec.begin(), vec.end());

    for (int i = 0; i < 2*n-1; i++)
        nex[vec[i].se] = vec[i+1].se^1;

    int st = 2*n;
    nex[st] = vec[0].se^1;
    nex[vec[2*n-1].se] = st;
    vis[st] = 1;

    int ans = dfs(nex[st]);
    for (int i = 0; i < 2*n; i++)
        if (!vis[i])
            pq.push(dfs(i));

    while (m--){
        if (pq.empty())
            ans++, pq.push(1);
        else
            ans += 2+pq.top(), pq.pop();
    }

    printf("%d\n", ans);
    return 0;
}

Compilation message (stderr)

teleporters.cpp: In function 'int main()':
teleporters.cpp:27:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   27 |     scanf("%d %d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~~
teleporters.cpp:30:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   30 |         scanf("%d %d", &a, &b);
      |         ~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 5 / 5
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• Subtask 19: 5 / 5
• Subtask 20: 5 / 5