Submission #1273299

#	Time	Username	Problem	Language	Result	Execution time	Memory
1273299		Faggi	Cyberland (APIO23_cyberland)	C++20	97 / 100	572 ms	54536 KiB

cyberland

#include <bits/stdc++.h>
#define ll long long
#define sz(x) int(x.size())
#define forn(i,n) for(i=0; i<n; i++)
#define all(x) x.begin(),x.end()
#define pb push_back
#define mp make_pair
#define fr first
#define se second
using namespace std;

const int MAXN=1e5+1;

vector<pair<ll,ll>>grafo[MAXN];
ll ar[MAXN], h;
bool vis[MAXN];
vector<ll>pos;
struct nod
{
    ll nodo, k;
    double dis;
    bool operator<(nod x)
    const {
        return dis>x.dis;
    }
};
bool ap=0;
void dfs(ll nod)
{
    if(nod==h)
    {
        ap=1;
        return;
    }
    vis[nod]=1;
    if(ar[nod]==0||nod==0)
        pos.pb(nod);
    for(auto k:grafo[nod])
        if(vis[k.fr]==0)
            dfs(k.fr);
}

void init(ll N)
{
    pos.resize(0);
    for(ll i=0; i<N; i++)
    {
        grafo[i].resize(0);
        vis[i]=0;
    }
    ap=0;
}

double solve(int N, int M, int K, int H, std::vector<int> x, std::vector<int> y, std::vector<int> c, std::vector<int> arr) {
    K=min(K,40);
    init(N);
    ll i;
    h=H;
    for(i=0; i<N; i++)
        ar[i]=arr[i];
    for(i=0; i<M; i++)
    {
        grafo[x[i]].pb({y[i],c[i]});
        grafo[y[i]].pb({x[i],c[i]});
    }

    priority_queue<nod>pq;
    nod v;
    vector<vector<double>>dist(N,vector<double>(K+1,1e14));
    dfs(0);
    if(ap==0)
        return -1;
    for(auto k:pos)
    {
        v.k=0;
        v.nodo=k;
        v.dis=0;
        dist[k][0]=0;
        pq.push(v);
    }
    while(pq.size())
    {
        v=pq.top();
        pq.pop();
        if(v.nodo==H)
            continue;
        if(v.dis!=dist[v.nodo][v.k])
            continue;
        for(auto k:grafo[v.nodo])
        {
            if(ar[k.fr]==0)
                continue;
            nod nV;
            nV.nodo=k.fr;
            nV.k=v.k+1;
            nV.dis=v.dis/2+k.se;
            if(ar[v.nodo]==2&&v.k+1<=K&&nV.dis<dist[k.fr][nV.k])
            {
                dist[k.fr][nV.k]=nV.dis;
                pq.push(nV);
            }
            nV.k--;
            nV.dis=v.dis+k.se;
            if(nV.dis<dist[k.fr][nV.k])
            {
                dist[k.fr][nV.k]=nV.dis;
                pq.push(nV);
            }
        }
    }
    double mi=dist[H][0];
    for(i=1; i<=K; i++)
        mi=min(mi,dist[H][i]);
    return mi;
}

• Subtask 1: 5 / 5
• Subtask 2: 8 / 8
• Subtask 3: 13 / 13
• Subtask 4: 19 / 19
• Subtask 5: 7 / 7
• Subtask 6: 16 / 16
• Subtask 7: 29 / 29
• Subtask 8: 0 / 3