Submission #984753

#	Time	Username	Problem	Language	Result	Execution time	Memory
984753		Faisal_Saqib	Cyberland (APIO23_cyberland)	C++17	15 / 100	24 ms	10332 KiB

cyberland

#include "cyberland.h"
#include <bits/stdc++.h>
using namespace std;
const int N=1e5+10;
int n;
double eps=1/(1e9);
vector<pair<int,double>> adj[N];
double dist[N];
double bef[N];
double save[N];
bool vis[N];
int spe[N],par[N];
double dyk(int s,int e,int ing=-1)
{
    for(int j=0;j<n;j++)
    {
        par[j]=-1;
        bef[j]=dist[j]=1e14+1;
    }
    priority_queue<pair<double,int>,vector<pair<double,int>>,greater<pair<double,int>>> pq;
    dist[s]=0;
    pq.push({dist[s],s});
    while(pq.size())
    {
        auto tp=pq.top();
        pq.pop();
        if(tp.second==ing)
            continue;
        if(tp.second==e)
            return tp.first;
        if((tp.first-dist[tp.second])<=eps)
        {
            int v=tp.second;
            for(auto [u,w]:adj[v])
            {
                if(par[v]==u)
                    continue;
                if((dist[v]+w)<dist[u])
                {
                    par[u]=v;
                    dist[u]=dist[v]+w;
                    bef[u]=min(bef[u],dist[u]);
                    if(spe[u]==0)
                        dist[u]=0;
                    pq.push({dist[u],u});
                }
            }
        }
    }
    return -1;
}
double solve(int NP, int m, int k, int h, vector<int> x, vector<int> y, vector<int> c, vector<int> arr) {
    n=NP;
    // DONT FORGET TO CLEAR THE THINGS YOU USED
    for(int i=0;i<n;i++)
    {
        adj[i].clear();
        spe[i]=arr[i];
    }
    bool all_one=1;
    for(auto i:arr)
        all_one&=(i==1);
    for(int j=0;j<m;j++)
    {
        adj[x[j]].push_back({y[j],c[j]});
        adj[y[j]].push_back({x[j],c[j]});
    }
    bool two=0;
    for(auto i:arr)
        two|=(i==2);
    if(all_one)
    {
        return dyk(0,h);
    }
    else if(!two)
    {
        dyk(h,-1);
        for(int i=0;i<n;i++)
            save[i]=bef[i];
        dyk(0,-1,h);
        double mn=2e14;
        for(int i=0;i<n;i++)
            mn=min(mn,dist[i]+save[i]);
        return mn;
    }
    return -1;
}

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