oj.uz

Submission #197728

# Submission time Handle Problem Language Result Execution time Memory
197728 2020-01-22T15:17:57 Z moonrabbit2 Beads and wires (APIO14_beads) C++17
100 / 100
 250 ms 26328 KB 
#include <bits/stdc++.h>
#define fi first
#define se second
using namespace std;
typedef long long ll;
typedef double db;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
typedef pair<db,db> pdb;
typedef tuple<int,int,int> tii;
typedef vector<vector<ll>> mat;
const ll mod=1e9+7;
const int N=2e5+5;
int n,ans,dp1[N],dp2[N],dp3[N],dp4[N],val[N];
vector<pii> g[N];
//dp1 : 없/끝, dp2 : 없/부모로, dp3 : 있/끝, dp4 : 있/부모로
void dfs(int x,int p){
    vector<int> v;
    dp2[x]=dp3[x]=dp4[x]=-1e9;
    int s=0;
    for(auto &it : g[x]) if(it.fi!=p){
        int u=it.fi,c=it.se;
        dfs(u,x);
        val[u]=max(dp1[u],dp2[u]+c);
        dp1[x]+=max(dp1[u],dp2[u]+c);
        v.emplace_back(dp1[u]-val[u]+c);
        s+=val[u];
    }
    sort(v.begin(),v.end()); reverse(v.begin(),v.end());
    for(auto &it : g[x]) if(it.fi!=p){
        int u=it.fi,c=it.se;
        dp2[x]=max(dp2[x],dp1[x]-val[u]+dp1[u]+c);
        dp3[x]=max(dp3[x],dp1[x]-val[u]+max(dp3[u],dp4[u]+c));
        dp4[x]=max(dp4[x],dp1[x]-val[u]+dp3[u]+c);
    }
    if(v.size()>=2){
        for(auto &it : g[x]) if(it.fi!=p){
            int u=it.fi,c=it.se;
            if(dp1[u]-val[u]+c==v[0]) dp3[x]=max(dp3[x],dp1[x]-val[u]+max(dp1[u],dp3[u])+c+v[1]);
            else dp3[x]=max(dp3[x],dp1[x]-val[u]+max(dp1[u],dp3[u])+c+v[0]);
        }
    }
    //cout<<x<<" : "<<dp1[x]<<" "<<dp2[x]<<" "<<dp3[x]<<" "<<dp4[x]<<"\n";
}
int main(){
    ios::sync_with_stdio(false); cin.tie(0);
	cin>>n; int s=0;
    for(int u,v,c,i=1;i<n;i++){
        cin>>u>>v>>c;
        s+=c;
        g[u].emplace_back(v,c);
        g[v].emplace_back(u,c);
    }
    dfs(1,0);
    cout<<max(dp1[1],dp3[1]);
    return 0;
}

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 4984 KB Output is correct
2 Correct 6 ms 4984 KB Output is correct
3 Correct 6 ms 4856 KB Output is correct
4 Correct 11 ms 5112 KB Output is correct
5 Correct 4 ms 4984 KB Output is correct
6 Correct 6 ms 5112 KB Output is correct
7 Correct 7 ms 4856 KB Output is correct
8 Correct 6 ms 5112 KB Output is correct
9 Correct 8 ms 5112 KB Output is correct
10 Correct 6 ms 4984 KB Output is correct
11 Correct 6 ms 4988 KB Output is correct
12 Correct 6 ms 5112 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 4984 KB Output is correct
2 Correct 6 ms 4984 KB Output is correct
3 Correct 6 ms 4856 KB Output is correct
4 Correct 11 ms 5112 KB Output is correct
5 Correct 4 ms 4984 KB Output is correct
6 Correct 6 ms 5112 KB Output is correct
7 Correct 7 ms 4856 KB Output is correct
8 Correct 6 ms 5112 KB Output is correct
9 Correct 8 ms 5112 KB Output is correct
10 Correct 6 ms 4984 KB Output is correct
11 Correct 6 ms 4988 KB Output is correct
12 Correct 6 ms 5112 KB Output is correct
13 Correct 7 ms 5112 KB Output is correct
14 Correct 7 ms 5112 KB Output is correct
15 Correct 6 ms 5112 KB Output is correct
16 Correct 6 ms 5112 KB Output is correct
17 Correct 6 ms 4984 KB Output is correct
18 Correct 7 ms 5116 KB Output is correct
19 Correct 7 ms 5112 KB Output is correct
20 Correct 6 ms 4984 KB Output is correct
21 Correct 4 ms 4984 KB Output is correct
22 Correct 7 ms 5112 KB Output is correct

Subtask #3
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 4984 KB Output is correct
2 Correct 6 ms 4984 KB Output is correct
3 Correct 6 ms 4856 KB Output is correct
4 Correct 11 ms 5112 KB Output is correct
5 Correct 4 ms 4984 KB Output is correct
6 Correct 6 ms 5112 KB Output is correct
7 Correct 7 ms 4856 KB Output is correct
8 Correct 6 ms 5112 KB Output is correct
9 Correct 8 ms 5112 KB Output is correct
10 Correct 6 ms 4984 KB Output is correct
11 Correct 6 ms 4988 KB Output is correct
12 Correct 6 ms 5112 KB Output is correct
13 Correct 7 ms 5112 KB Output is correct
14 Correct 7 ms 5112 KB Output is correct
15 Correct 6 ms 5112 KB Output is correct
16 Correct 6 ms 5112 KB Output is correct
17 Correct 6 ms 4984 KB Output is correct
18 Correct 7 ms 5116 KB Output is correct
19 Correct 7 ms 5112 KB Output is correct
20 Correct 6 ms 4984 KB Output is correct
21 Correct 4 ms 4984 KB Output is correct
22 Correct 7 ms 5112 KB Output is correct
23 Correct 9 ms 5368 KB Output is correct
24 Correct 9 ms 5368 KB Output is correct
25 Correct 10 ms 5368 KB Output is correct
26 Correct 13 ms 5624 KB Output is correct
27 Correct 12 ms 5596 KB Output is correct
28 Correct 12 ms 5752 KB Output is correct
29 Correct 12 ms 5624 KB Output is correct
30 Correct 12 ms 5624 KB Output is correct
31 Correct 13 ms 6264 KB Output is correct

Subtask #4
43.0 / 43.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 4984 KB Output is correct
2 Correct 6 ms 4984 KB Output is correct
3 Correct 6 ms 4856 KB Output is correct
4 Correct 11 ms 5112 KB Output is correct
5 Correct 4 ms 4984 KB Output is correct
6 Correct 6 ms 5112 KB Output is correct
7 Correct 7 ms 4856 KB Output is correct
8 Correct 6 ms 5112 KB Output is correct
9 Correct 8 ms 5112 KB Output is correct
10 Correct 6 ms 4984 KB Output is correct
11 Correct 6 ms 4988 KB Output is correct
12 Correct 6 ms 5112 KB Output is correct
13 Correct 7 ms 5112 KB Output is correct
14 Correct 7 ms 5112 KB Output is correct
15 Correct 6 ms 5112 KB Output is correct
16 Correct 6 ms 5112 KB Output is correct
17 Correct 6 ms 4984 KB Output is correct
18 Correct 7 ms 5116 KB Output is correct
19 Correct 7 ms 5112 KB Output is correct
20 Correct 6 ms 4984 KB Output is correct
21 Correct 4 ms 4984 KB Output is correct
22 Correct 7 ms 5112 KB Output is correct
23 Correct 9 ms 5368 KB Output is correct
24 Correct 9 ms 5368 KB Output is correct
25 Correct 10 ms 5368 KB Output is correct
26 Correct 13 ms 5624 KB Output is correct
27 Correct 12 ms 5596 KB Output is correct
28 Correct 12 ms 5752 KB Output is correct
29 Correct 12 ms 5624 KB Output is correct
30 Correct 12 ms 5624 KB Output is correct
31 Correct 13 ms 6264 KB Output is correct
32 Correct 45 ms 7828 KB Output is correct
33 Correct 42 ms 7944 KB Output is correct
34 Correct 43 ms 7948 KB Output is correct
35 Correct 242 ms 16548 KB Output is correct
36 Correct 250 ms 16608 KB Output is correct
37 Correct 243 ms 16476 KB Output is correct
38 Correct 175 ms 18532 KB Output is correct
39 Correct 171 ms 20696 KB Output is correct
40 Correct 178 ms 21176 KB Output is correct
41 Correct 250 ms 26328 KB Output is correct