oj.uz

답안 #847084

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
847084 2023-09-09T06:32:25 Z dungz Valley (BOI19_valley) C++17
100 / 100
 191 ms 49312 KB 
//dau tuyen
//dau tuyen
//dau tuyen
#pragma GCC optimize ("O2")
#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define fi first
#define se second
#define endl '\n'
#define task "task"
#define task "task"
#define prll pair<ll,ll>
#define pb push_back
#define ld long double
const ll MIN=-1e18,MAX=1e18,MOD=1e9+7,nmax=1e5+5;
ll cost[nmax],f[nmax],mn[nmax][25];
int h[nmax],up[nmax][25];
vector<pair<int,ll>> a[nmax];
bool str[nmax];
vector<pair<int,int>> edge;
void dfs(int u,int par)
{
    for(auto i:a[u])
    {
        if(i.fi!=par)
        {
            cost[i.fi]=cost[u]+i.se;
            h[i.fi]=h[u]+1;
            dfs(i.fi,u);
        }
    }
}
void dfs2(int u,int par)
{
    f[u]=MAX;
    if(str[u]) f[u]=cost[u];
    for(auto i:a[u])
    {
        if(i.fi!=par)
        {
            dfs2(i.fi,u);
            f[u]=min(f[u],f[i.fi]);
        }
    }
}
void dfs3(int u,int par)
{
    for(auto i:a[u])
    {
        if(i.fi!=par)
        {
            up[i.fi][0]=u;
            mn[i.fi][0]=f[u]-2*cost[u];
            for(int j=1;j<=20;j++)
            {
                up[i.fi][j]=up[up[i.fi][j-1]][j-1];
                mn[i.fi][j]=min(mn[i.fi][j-1],mn[up[i.fi][j-1]][j-1]);
            }
            dfs3(i.fi,u);
        }
    }
}
int main(){

    ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    int n,s,q,e;
    cin>>n>>s>>q>>e;
    edge.push_back({0,0});
    for(int i=1;i<=n-1;i++)
    {
        int x,y,z;
        cin>>x>>y>>z;
        a[x].push_back({y,z});
        a[y].push_back({x,z});
        edge.push_back({x,y});
    }
    for(int i=1;i<=s;i++)
    {
        int x;
        cin>>x;
        str[x]=1;
    }
    dfs(e,0);
    dfs2(e,0);
    dfs3(e,0);
    while(q--)
    {
        int u,v;
        cin>>u>>v;
        if(h[edge[u].fi]>h[edge[u].se]) swap(edge[u].fi,edge[u].se);
//        cout<<h[edge[u].se]<<" "<<h[v]<<" "<<edge[u].se<<" "<<v<<endl;
        if(h[edge[u].fi]>=h[v])
        {
            cout<<"escaped"<<endl;
            continue;
        }
        int gap=-h[edge[u].se]+h[v];
//        cout<<"type2";
        int v2=v;
        for(int i=0;i<=20;i++)
        {
            if(gap&(1<<i))
            {
                gap-=(1<<i);
                v2=up[v2][i];
            }
        }
        if(v2!=edge[u].se)
        {
            cout<<"escaped"<<endl;
            continue;
        }
        gap=-h[edge[u].se]+h[v];
        ll ans=MAX;
        v2=v;
        for(int i=0;i<=20;i++)
        {
            if(gap&(1<<i))
            {
                gap-=(1<<i);
                ans=min(ans,cost[v]+mn[v2][i]);
                v2=up[v2][i];
            }
        }
//        cout<<f[v]<<" "<<cost[v]<<" "<<;
        ans=min(ans,f[v]-cost[v]);
        if(ans>1e15) cout<<"oo"<<endl;
        else cout<<ans<<endl;
     }
//     cout<<mn[5][1]<<cost[3]<<" "<<cost[4]<<" "<<cost[5]<<" "<<f[5];
}
/*

*/

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 6748 KB Output is correct
2 Correct 3 ms 6852 KB Output is correct
3 Correct 3 ms 6744 KB Output is correct
4 Correct 3 ms 6748 KB Output is correct

Subtask #2
27.0 / 27.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 6748 KB Output is correct
2 Correct 3 ms 6852 KB Output is correct
3 Correct 3 ms 6744 KB Output is correct
4 Correct 3 ms 6748 KB Output is correct
5 Correct 2 ms 6748 KB Output is correct
6 Correct 2 ms 6748 KB Output is correct
7 Correct 2 ms 6852 KB Output is correct
8 Correct 2 ms 6744 KB Output is correct
9 Correct 2 ms 6748 KB Output is correct
10 Correct 2 ms 6748 KB Output is correct
11 Correct 2 ms 6744 KB Output is correct
12 Correct 2 ms 6748 KB Output is correct
13 Correct 2 ms 6748 KB Output is correct
14 Correct 2 ms 6748 KB Output is correct

Subtask #3
23.0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 109 ms 40604 KB Output is correct
2 Correct 113 ms 40388 KB Output is correct
3 Correct 125 ms 40764 KB Output is correct
4 Correct 137 ms 42624 KB Output is correct
5 Correct 129 ms 42692 KB Output is correct
6 Correct 152 ms 44744 KB Output is correct

Subtask #4
41.0 / 41.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 6748 KB Output is correct
2 Correct 3 ms 6852 KB Output is correct
3 Correct 3 ms 6744 KB Output is correct
4 Correct 3 ms 6748 KB Output is correct
5 Correct 2 ms 6748 KB Output is correct
6 Correct 2 ms 6748 KB Output is correct
7 Correct 2 ms 6852 KB Output is correct
8 Correct 2 ms 6744 KB Output is correct
9 Correct 2 ms 6748 KB Output is correct
10 Correct 2 ms 6748 KB Output is correct
11 Correct 2 ms 6744 KB Output is correct
12 Correct 2 ms 6748 KB Output is correct
13 Correct 2 ms 6748 KB Output is correct
14 Correct 2 ms 6748 KB Output is correct
15 Correct 109 ms 40604 KB Output is correct
16 Correct 113 ms 40388 KB Output is correct
17 Correct 125 ms 40764 KB Output is correct
18 Correct 137 ms 42624 KB Output is correct
19 Correct 129 ms 42692 KB Output is correct
20 Correct 152 ms 44744 KB Output is correct
21 Correct 97 ms 43792 KB Output is correct
22 Correct 105 ms 43768 KB Output is correct
23 Correct 123 ms 43968 KB Output is correct
24 Correct 154 ms 46280 KB Output is correct
25 Correct 191 ms 49096 KB Output is correct
26 Correct 102 ms 43972 KB Output is correct
27 Correct 102 ms 43720 KB Output is correct
28 Correct 122 ms 43972 KB Output is correct
29 Correct 161 ms 45508 KB Output is correct
30 Correct 140 ms 47104 KB Output is correct
31 Correct 95 ms 44072 KB Output is correct
32 Correct 109 ms 43944 KB Output is correct
33 Correct 132 ms 44296 KB Output is correct
34 Correct 140 ms 46020 KB Output is correct
35 Correct 156 ms 49312 KB Output is correct
36 Correct 130 ms 46016 KB Output is correct