Submission #980441

#	Time	Username	Problem	Language	Result	Execution time	Memory
980441		Nexus	Cyberland (APIO23_cyberland)	C++17	15 / 100	31 ms	35932 KiB

cyberland

#include <bits/stdc++.h>
#define ll long long
 
using namespace std;
 
const ll N=1e6+9,M=2e18+9,mod=1e9+7;
 
ll vis[N],dis0[N],dish[N],nd;
priority_queue<pair<ll,ll>>q;
vector<pair<ll,ll>>v[N];
 
double solve(int n, int m, int k, int h, vector<int> x, vector<int>y, vector<int> c, vector<int> arr)
{
 
    for(ll i=0;i<n;++i)v[i].clear();
 
    for(ll i=0;i<m;++i)
    {
        v[x[i]].push_back({c[i],y[i]});
        v[y[i]].push_back({c[i],x[i]});
    }
 
    for(ll i=0;i<n;++i)dis0[i]=M,dish[i]=M;
 
    dis0[0]=0,dish[h]=0;
    q.push({0,0});
 
    for(ll i=0;i<n;++i)vis[i]=0;
    while(q.size())
    {
        nd=q.top().second;
        q.pop();
        if(vis[nd])continue;
        vis[nd]=1;
      	if(nd==h)break;
        for(auto i:v[nd])
        {
            if(dis0[nd]+i.first<dis0[i.second])
            {
                dis0[i.second]=dis0[nd]+i.first;
                q.push({-dis0[i.second],i.second});
            }
        }
    }
  	while(q.size())q.pop();
 
 
    q.push({0,h});
 
    for(ll i=0;i<n;++i)vis[i]=0;
    while(q.size())
    {
        nd=q.top().second;
        q.pop();
        if(vis[nd])continue;
        vis[nd]=1;
        for(auto i:v[nd])
        {
            if(dish[nd]+i.first<dish[i.second])
            {
                dish[i.second]=dish[nd]+i.first;
                q.push({-dish[i.second],i.second});
            }
        }
    }
 
    ll ans=M;
    for(ll i=0;i<n;++i)
    {
        if(max(dis0[i],dish[i])==M)continue;
        //cout<<i<<' '<<dis0[i]<<' '<<dish[i]<<'\n';
        if(!arr[i])ans=min(ans,dish[i]);
        else ans=min(ans,dis0[i]+dish[i]);
    }
 
    if(ans==M)ans=-1;
 
    return ans;
}
 
/*
int main()
{
    ios::sync_with_stdio(0);
    //cin.tie(0);cout.tie(0);
 
    int T;
    cin>>T;
  while (T--){
    int n,m,K,H;
    cin>>n>>m>>K>>H;
    vector<int> x(m);
    vector<int> y(m);
    vector<int> c(m);
    vector<int> arr(n);
    for (int i=0;i<n;i++)cin>>arr[i];
    for (int i=0;i<m;i++)
        cin>>x[i]>>y[i]>>c[i];
    cout<<solve(n, m, K, H, x, y, c, arr)<<'\n';
  }
}
*/

• 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