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Submission #755025

# Submission time Handle Problem Language Result Execution time Memory
755025 2023-06-09T10:10:13 Z ttamx Beads and wires (APIO14_beads) C++14
100 / 100
 135 ms 21564 KB 
#include<bits/stdc++.h>

using namespace std;

const int N=2e5+5;

int n;
vector<pair<int,int>> adj[N];
int dp[N][4];

void dfs(int u,int p=0){
    pair<pair<int,int>,pair<int,int>> mx={{-1e9,-1},{-1e9,-1}},mx2={{-1e9,-1},{-1e9,-1}};
    int c0=-1e9;
    for(auto [v,w]:adj[u]){
        if(v==p)continue;
        dfs(v,u);
        int res=max(dp[v][0],dp[v][2]+w);
        dp[u][0]+=res;
        dp[u][1]+=res;
        dp[u][2]+=res;
        dp[u][3]+=res;
        mx.second=max(mx.second,{dp[v][0]+w-res,v});
        if(mx.second>mx.first)swap(mx.first,mx.second);
        mx2.second=max(mx2.second,{dp[v][1]+w-res,v});
        if(mx2.second>mx2.first)swap(mx2.first,mx2.second);
        c0=max(c0,max(dp[v][1],dp[v][3]+w)-res);
    }
    int c1=mx.first.first+max(mx.second.first,mx.first.second!=mx2.first.second?mx2.first.first:mx2.second.first);
    int c2=mx2.first.first+(mx2.first.second!=mx.first.second?mx.first.first:mx.second.first);
    dp[u][1]+=max({c0,c1,c2});
    dp[u][2]+=mx.first.first;
    dp[u][3]+=mx2.first.first;
}

int main(){
    cin.tie(nullptr)->sync_with_stdio(false);
    cin >> n;
    for(int i=1;i<n;i++){
        int u,v,w;
        cin >> u >> v >> w;
        adj[u].emplace_back(v,w);
        adj[v].emplace_back(u,w);
    }
    dfs(1);
    cout << max(dp[1][0],dp[1][1]);
}

Compilation message

beads.cpp: In function 'void dfs(int, int)':
beads.cpp:14:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   14 |     for(auto [v,w]:adj[u]){
      |              ^

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 3 ms 4948 KB Output is correct
4 Correct 3 ms 4948 KB Output is correct
5 Correct 4 ms 4896 KB Output is correct
6 Correct 2 ms 4948 KB Output is correct
7 Correct 2 ms 4948 KB Output is correct
8 Correct 3 ms 4948 KB Output is correct
9 Correct 2 ms 4948 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 3 ms 4948 KB Output is correct
12 Correct 3 ms 4948 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 3 ms 4948 KB Output is correct
4 Correct 3 ms 4948 KB Output is correct
5 Correct 4 ms 4896 KB Output is correct
6 Correct 2 ms 4948 KB Output is correct
7 Correct 2 ms 4948 KB Output is correct
8 Correct 3 ms 4948 KB Output is correct
9 Correct 2 ms 4948 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 3 ms 4948 KB Output is correct
12 Correct 3 ms 4948 KB Output is correct
13 Correct 3 ms 4948 KB Output is correct
14 Correct 3 ms 4948 KB Output is correct
15 Correct 3 ms 4948 KB Output is correct
16 Correct 3 ms 4948 KB Output is correct
17 Correct 3 ms 4948 KB Output is correct
18 Correct 3 ms 4948 KB Output is correct
19 Correct 3 ms 4948 KB Output is correct
20 Correct 3 ms 4948 KB Output is correct
21 Correct 3 ms 4948 KB Output is correct
22 Correct 3 ms 4948 KB Output is correct

Subtask #3
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 3 ms 4948 KB Output is correct
4 Correct 3 ms 4948 KB Output is correct
5 Correct 4 ms 4896 KB Output is correct
6 Correct 2 ms 4948 KB Output is correct
7 Correct 2 ms 4948 KB Output is correct
8 Correct 3 ms 4948 KB Output is correct
9 Correct 2 ms 4948 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 3 ms 4948 KB Output is correct
12 Correct 3 ms 4948 KB Output is correct
13 Correct 3 ms 4948 KB Output is correct
14 Correct 3 ms 4948 KB Output is correct
15 Correct 3 ms 4948 KB Output is correct
16 Correct 3 ms 4948 KB Output is correct
17 Correct 3 ms 4948 KB Output is correct
18 Correct 3 ms 4948 KB Output is correct
19 Correct 3 ms 4948 KB Output is correct
20 Correct 3 ms 4948 KB Output is correct
21 Correct 3 ms 4948 KB Output is correct
22 Correct 3 ms 4948 KB Output is correct
23 Correct 5 ms 5204 KB Output is correct
24 Correct 4 ms 5204 KB Output is correct
25 Correct 4 ms 5204 KB Output is correct
26 Correct 7 ms 5488 KB Output is correct
27 Correct 6 ms 5460 KB Output is correct
28 Correct 7 ms 5588 KB Output is correct
29 Correct 6 ms 5460 KB Output is correct
30 Correct 5 ms 5588 KB Output is correct
31 Correct 6 ms 6100 KB Output is correct

Subtask #4
43.0 / 43.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 3 ms 4948 KB Output is correct
4 Correct 3 ms 4948 KB Output is correct
5 Correct 4 ms 4896 KB Output is correct
6 Correct 2 ms 4948 KB Output is correct
7 Correct 2 ms 4948 KB Output is correct
8 Correct 3 ms 4948 KB Output is correct
9 Correct 2 ms 4948 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 3 ms 4948 KB Output is correct
12 Correct 3 ms 4948 KB Output is correct
13 Correct 3 ms 4948 KB Output is correct
14 Correct 3 ms 4948 KB Output is correct
15 Correct 3 ms 4948 KB Output is correct
16 Correct 3 ms 4948 KB Output is correct
17 Correct 3 ms 4948 KB Output is correct
18 Correct 3 ms 4948 KB Output is correct
19 Correct 3 ms 4948 KB Output is correct
20 Correct 3 ms 4948 KB Output is correct
21 Correct 3 ms 4948 KB Output is correct
22 Correct 3 ms 4948 KB Output is correct
23 Correct 5 ms 5204 KB Output is correct
24 Correct 4 ms 5204 KB Output is correct
25 Correct 4 ms 5204 KB Output is correct
26 Correct 7 ms 5488 KB Output is correct
27 Correct 6 ms 5460 KB Output is correct
28 Correct 7 ms 5588 KB Output is correct
29 Correct 6 ms 5460 KB Output is correct
30 Correct 5 ms 5588 KB Output is correct
31 Correct 6 ms 6100 KB Output is correct
32 Correct 23 ms 7668 KB Output is correct
33 Correct 22 ms 7632 KB Output is correct
34 Correct 23 ms 7672 KB Output is correct
35 Correct 131 ms 15528 KB Output is correct
36 Correct 131 ms 15620 KB Output is correct
37 Correct 135 ms 15592 KB Output is correct
38 Correct 89 ms 15820 KB Output is correct
39 Correct 87 ms 15876 KB Output is correct
40 Correct 91 ms 15796 KB Output is correct
41 Correct 127 ms 21564 KB Output is correct