oj.uz

Submission #876582

# Submission time Handle Problem Language Result Execution time Memory
876582 2023-11-22T02:18:12 Z imarn Valley (BOI19_valley) C++14
100 / 100
 170 ms 50516 KB 
#include<bits/stdc++.h>
#define ll long long
#define pii pair<ll,ll>
#define pll pair<ll,ll>
#define all(x) x.begin(),x.end()
#define pb push_back
#define sz(x) (int)x.size()
#define f first
#define s second
#define vi vector<int>
#define vll vector<long long>
#define vpii vector<pii>
using namespace std;
const int N=1e5+5;
vector<pii>g[N];
ll d[N]{0},pr[N][18],dp[N][19],dep[N]{0},node[N]{0};
pii ro[N];
int tin[N]{0},tout[N]{0};
int t=0;
ll dfs(int u,int p,int l){
    pr[u][0]=p;dep[u]=l;ll mn=1e17;
    for(int i=1;i<=17;i++)pr[u][i]=pr[pr[u][i-1]][i-1];
    if(node[u])mn=d[u];
    tin[u]=++t;
    for(auto v:g[u]){
        if(v.f==p)continue;
        d[v.f]=d[u]+v.s;
        mn=min(mn,dfs(v.f,u,l+1));
    }dp[u][0] = mn-2*d[u];tout[u]=t;
    return mn;
}
int main(){
    ios_base::sync_with_stdio(0);cin.tie(0);
    int n,s,q,e;cin>>n>>s>>q>>e;
    for(int i=1,u,v,w;i<=n-1;i++)cin>>u>>v>>w,g[u].pb({v,w}),g[v].pb({u,w}),ro[i]={u,v};
    for(int i=1,u;i<=s;i++)cin>>u,node[u]=1;
    dfs(e,e,0);
    for(int j=1;j<=18;j++)for(int i=1;i<=n;i++)dp[i][j]=min(dp[i][j-1],dp[pr[i][j-1]][j-1]);
    while(q--){
        int i,r,x,y;cin>>i>>r;tie(x,y)=ro[i];if(dep[x]<dep[y])swap(x,y);ll ans=1e17;int cur=r;
        if(!(tin[x]<=tin[r]&&tin[r]<=tout[x])){cout<<"escaped\n";continue;}
        for(int i=17;i>=0;i--)if(dep[x]<=dep[pr[cur][i]])ans=min(ans,dp[cur][i]+d[r]),cur=pr[cur][i];
        ans=min(ans,d[r]+dp[cur][0]);
        if(ans>=1e15)cout<<"oo\n";
        else cout<<ans<<"\n";
    }
}

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 9564 KB Output is correct
2 Correct 4 ms 9764 KB Output is correct
3 Correct 4 ms 9716 KB Output is correct
4 Correct 3 ms 9612 KB Output is correct

Subtask #2
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 9564 KB Output is correct
2 Correct 4 ms 9764 KB Output is correct
3 Correct 4 ms 9716 KB Output is correct
4 Correct 3 ms 9612 KB Output is correct
5 Correct 2 ms 9712 KB Output is correct
6 Correct 3 ms 9560 KB Output is correct
7 Correct 2 ms 9564 KB Output is correct
8 Correct 2 ms 9564 KB Output is correct
9 Correct 2 ms 9612 KB Output is correct
10 Correct 3 ms 9564 KB Output is correct
11 Correct 2 ms 9680 KB Output is correct
12 Correct 2 ms 9564 KB Output is correct
13 Correct 2 ms 9608 KB Output is correct
14 Correct 2 ms 9564 KB Output is correct

Subtask #3
23.0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 119 ms 42488 KB Output is correct
2 Correct 126 ms 42064 KB Output is correct
3 Correct 126 ms 42056 KB Output is correct
4 Correct 168 ms 44184 KB Output is correct
5 Correct 140 ms 44120 KB Output is correct
6 Correct 135 ms 46300 KB Output is correct

Subtask #4
41.0 / 41.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 9564 KB Output is correct
2 Correct 4 ms 9764 KB Output is correct
3 Correct 4 ms 9716 KB Output is correct
4 Correct 3 ms 9612 KB Output is correct
5 Correct 2 ms 9712 KB Output is correct
6 Correct 3 ms 9560 KB Output is correct
7 Correct 2 ms 9564 KB Output is correct
8 Correct 2 ms 9564 KB Output is correct
9 Correct 2 ms 9612 KB Output is correct
10 Correct 3 ms 9564 KB Output is correct
11 Correct 2 ms 9680 KB Output is correct
12 Correct 2 ms 9564 KB Output is correct
13 Correct 2 ms 9608 KB Output is correct
14 Correct 2 ms 9564 KB Output is correct
15 Correct 119 ms 42488 KB Output is correct
16 Correct 126 ms 42064 KB Output is correct
17 Correct 126 ms 42056 KB Output is correct
18 Correct 168 ms 44184 KB Output is correct
19 Correct 140 ms 44120 KB Output is correct
20 Correct 135 ms 46300 KB Output is correct
21 Correct 115 ms 45396 KB Output is correct
22 Correct 127 ms 45140 KB Output is correct
23 Correct 123 ms 45396 KB Output is correct
24 Correct 141 ms 47508 KB Output is correct
25 Correct 150 ms 50500 KB Output is correct
26 Correct 110 ms 45392 KB Output is correct
27 Correct 120 ms 45324 KB Output is correct
28 Correct 140 ms 45612 KB Output is correct
29 Correct 150 ms 46928 KB Output is correct
30 Correct 170 ms 48568 KB Output is correct
31 Correct 107 ms 45644 KB Output is correct
32 Correct 132 ms 45788 KB Output is correct
33 Correct 131 ms 45556 KB Output is correct
34 Correct 150 ms 47596 KB Output is correct
35 Correct 144 ms 50516 KB Output is correct
36 Correct 136 ms 47488 KB Output is correct