Submission #1067090

#	Time	Username	Problem	Language	Result	Execution time	Memory
1067090		quan606303	Commuter Pass (JOI18_commuter_pass)	C++14	0 / 100	196 ms	24752 KiB

commuter_pass

///0-0 : what is your motivation, quan606303?
///quan606303 : Hutao
/*idea : 



*/
#include <bits/stdc++.h>
#define int long long
#define ll long long
#define INTMAX INT_MAX
#define INTMIN INT_MIN
#define LONGMAX LLONG_MAX
#define LONGMIN LLONG_MIN
#define fi first
#define se second
#define memfull(a,b) memset(a,b,sizeof(a));
#define endl '\n'
#define file(a) freopen(a".inp","r",stdin); freopen(a".out","w",stdout);
using namespace std;
const int MOD=1e9+7;
const int maxn=100000+7;
bool vst[maxn];
int dis_S[maxn],dis_T[maxn],dis_U[maxn],dis_V[maxn],n,m;
vector<pair<int,int> > adj[maxn];
void dij(int x,int *dis)
{
    memfull(vst,0);
    for (int i=1;i<=n;i++)dis[i]=1e18;
    dis[x]=0;
    priority_queue<pair<int,int>,vector<pair<int,int> >,greater<pair<int,int> > > q;
    q.push({0,x});
    while (q.size())
    {
        pair<int,int> cnt=q.top();
        q.pop();
        if (vst[cnt.se])continue;
        vst[cnt.se]=true;
        for (auto i:adj[cnt.se])
        {
            if (dis[i.fi]>dis[cnt.se]+i.se)
            {
                dis[i.fi]=dis[cnt.se]+i.se;
                q.push({dis[i.fi],i.fi});
            }
        }
    }
}
int s,t,u,v,dp[maxn][2];
bool cmp(int x,int y)
{
    return dis_S[x]<dis_S[y];
}
int32_t main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
   //file("");
    cin>>n>>m>>s>>t>>u>>v;
    for (int i=1;i<=m;i++)
    {
        int x,y,w;
        cin>>x>>y>>w;
        adj[x].push_back({y,w});
        adj[y].push_back({x,w});
    }
    dij(s,dis_S);
    dij(t,dis_T);
    dij(u,dis_U);
    dij(v,dis_V);
    vector<int> vt;
    for (int i=1;i<=n;i++)vt.push_back(i),dp[i][0]=dp[i][1]=1e18;
    sort(vt.begin(),vt.end());
    int res=dis_U[v];
    for (auto i:vt)
    {
        if (dis_S[i]+dis_T[i]==dis_S[t])
        {
            dp[i][0]=dis_U[i];
            dp[i][1]=dis_V[i];
            for (auto j:adj[i])
            {
                if (dis_S[j.fi]+j.se==dis_S[i])
                {
                    dp[i][0]=min(dp[i][0],dp[j.fi][0]);
                    dp[i][1]=min(dp[i][1],dp[j.fi][1]);
                }
            }
            res=min({res,dp[i][0]+dis_V[i],dp[i][1]+dis_U[i]});
        }
    }
    cout<<res;
    return 0;
}

• Subtask 1: 0 / 16
• Subtask 2: 0 / 15
• Subtask 3: 0 / 24
• Subtask 4: 0 / 45