Submission #756952

#	Time	Username	Problem	Language	Result	Execution time	Memory
756952		Valters07	Cyberland (APIO23_cyberland)	C++17	97 / 100	3047 ms	38364 KiB

cyberland

#include <bits/stdc++.h>
#include "cyberland.h"
#define ll long long
#define pb push_back
#define fi first
#define se second
using namespace std;
const int N = 1e5+5;
const int K = 30+2;
vector<pair<int,int> > g[N];
double dist[N][K];
bool vis[N][K], vis2[N];
vector<int> starts, arr2;
void dfs(int u, int h)
{
    vis2[u]=1;
    if(arr2[u]==0)
        starts.pb(u);
    for(auto v:g[u])
        if(!vis2[v.fi]&&v.fi!=h)
            dfs(v.fi,h);
}
double solve(int n, int m, int k, int h, vector<int> x,
             vector<int> y, vector<int> c, vector<int> arr)
{
    arr2=arr;
    for(int i = 0;i<m;i++)
        g[x[i]].pb({y[i],c[i]}),
        g[y[i]].pb({x[i],c[i]});
    for(int i = 0;i<n;i++)
        for(int j = 0;j<=k;j++)
            dist[i][j]=1e15,
            vis[i][j]=0;
    priority_queue<pair<double,pair<int,int> >,vector<pair<double,pair<int,int> > >,greater<pair<double,pair<int,int> > > > q[k+1];
    dist[0][0]=0;
    q[0].push({0,{0,0}});
    for(int i = 0;i<n;i++)
        vis2[i]=0;
    dfs(0,h);
    for(auto x:starts)
        q[0].push({0,{x,0}}),
        dist[x][0]=0;
    starts.clear();
    for(int i = 0;i<=k;i++)
        vis[h][i]=1;
    for(int qi = 0;qi<=k;qi++)
    {
        while(!q[qi].empty())
        {
            int u = q[qi].top().se.fi, dv = q[qi].top().se.se;
            q[qi].pop();
            if(vis[u][dv])
                continue;
            vis[u][dv]=1;
            for(auto v:g[u])
            {
                double nwc = dist[u][dv]+v.se;
                if(dist[v.fi][dv]>nwc)
                    dist[v.fi][dv]=nwc,
                    q[qi].push({nwc,{v.fi,dv}});
                if(arr[v.fi]==2&&dv<k)
                {
                    nwc/=2;
                    if(dist[v.fi][dv+1]>nwc)
                        dist[v.fi][dv+1]=nwc,
                        q[qi+1].push({nwc,{v.fi,dv+1}});
                }
            }
        }
    }
    double best = 1e15;
    for(int i = 0;i<=k;i++)
        best=min(best,dist[h][i]);
    for(int i = 0;i<n;i++)
        g[i].clear();
    if(best>=2e14)
        return -1;
    return best;
}

• 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