oj.uz

Submission #670254

# Submission time Handle Problem Language Result Execution time Memory
670254 2022-12-08T13:32:40 Z fatemetmhr Beads and wires (APIO14_beads) C++17
100 / 100
 183 ms 27768 KB 
// hmmm... na dige chizi baraye goftan namoonde


#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

#define all(x) x.begin(), x.end()
#define pb     push_back
#define fi     first
#define se     second

const int maxn5 = 3e5 + 10;
const int lg    = 20;
const ll  inf   = 1e18;

ll dp[2][maxn5], ans = 0, fpar[2][maxn5];
vector <pair<int, int>> adj[maxn5];

void dfs2(int v, int par){
    ll sum = 0;
    ll smx = -inf, mx = -inf;
    if(par != -1){
        sum += fpar[0][v];
        mx = max(mx, fpar[1][v] - fpar[0][v]);
    }
    for(auto [u, w] : adj[v]) if(u != par){
        sum += dp[0][u];
        ll val = dp[1][u] - dp[0][u];
        if(val >= mx)
            smx = mx, mx = val;
        else
            smx = max(smx, val);
    }
    ans = max(ans, sum);
    for(auto [u, w] : adj[v]) if(u != par){
        fpar[1][u] = w + sum - dp[0][u];
        fpar[0][u] = max(sum - dp[0][u], w + sum - dp[0][u] + (mx == dp[1][u] - dp[0][u] ? smx : mx));
        dfs2(u, v); 
    }
}


void dfs(int v, int par){
    for(auto [u, w] : adj[v]) if(u != par){
        dp[1][u] = w;
        dfs(u, v);
        dp[0][v] = max(dp[0][v] + dp[0][u], dp[1][v] + dp[1][u]);
        dp[1][v] += dp[0][u];
    }
}



int main(){
    ios_base::sync_with_stdio(false); cin.tie(0);

    int n; cin >> n;
    for(int i = 0; i < n - 1; i ++){
        int a, b, c; cin >> a >> b >> c;
        a--; b--;
        adj[a].pb({b, c});
        adj[b].pb({a, c});
    }

    dfs(0, -1);
    dfs2(0, -1);

    cout << ans << endl;

}

/*
10
4 10 2
1 2 21
1 3 13
6 7 1
7 9 5
2 4 3
2 5 8
1 6 55
6 8 34
*/

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 7380 KB Output is correct
2 Correct 4 ms 7380 KB Output is correct
3 Correct 5 ms 7380 KB Output is correct
4 Correct 4 ms 7380 KB Output is correct
5 Correct 4 ms 7380 KB Output is correct
6 Correct 4 ms 7376 KB Output is correct
7 Correct 4 ms 7376 KB Output is correct
8 Correct 4 ms 7380 KB Output is correct
9 Correct 4 ms 7380 KB Output is correct
10 Correct 4 ms 7380 KB Output is correct
11 Correct 4 ms 7380 KB Output is correct
12 Correct 5 ms 7380 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 7380 KB Output is correct
2 Correct 4 ms 7380 KB Output is correct
3 Correct 5 ms 7380 KB Output is correct
4 Correct 4 ms 7380 KB Output is correct
5 Correct 4 ms 7380 KB Output is correct
6 Correct 4 ms 7376 KB Output is correct
7 Correct 4 ms 7376 KB Output is correct
8 Correct 4 ms 7380 KB Output is correct
9 Correct 4 ms 7380 KB Output is correct
10 Correct 4 ms 7380 KB Output is correct
11 Correct 4 ms 7380 KB Output is correct
12 Correct 5 ms 7380 KB Output is correct
13 Correct 4 ms 7380 KB Output is correct
14 Correct 4 ms 7380 KB Output is correct
15 Correct 4 ms 7372 KB Output is correct
16 Correct 4 ms 7380 KB Output is correct
17 Correct 5 ms 7376 KB Output is correct
18 Correct 4 ms 7380 KB Output is correct
19 Correct 4 ms 7312 KB Output is correct
20 Correct 4 ms 7380 KB Output is correct
21 Correct 4 ms 7372 KB Output is correct
22 Correct 4 ms 7380 KB Output is correct

Subtask #3
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 7380 KB Output is correct
2 Correct 4 ms 7380 KB Output is correct
3 Correct 5 ms 7380 KB Output is correct
4 Correct 4 ms 7380 KB Output is correct
5 Correct 4 ms 7380 KB Output is correct
6 Correct 4 ms 7376 KB Output is correct
7 Correct 4 ms 7376 KB Output is correct
8 Correct 4 ms 7380 KB Output is correct
9 Correct 4 ms 7380 KB Output is correct
10 Correct 4 ms 7380 KB Output is correct
11 Correct 4 ms 7380 KB Output is correct
12 Correct 5 ms 7380 KB Output is correct
13 Correct 4 ms 7380 KB Output is correct
14 Correct 4 ms 7380 KB Output is correct
15 Correct 4 ms 7372 KB Output is correct
16 Correct 4 ms 7380 KB Output is correct
17 Correct 5 ms 7376 KB Output is correct
18 Correct 4 ms 7380 KB Output is correct
19 Correct 4 ms 7312 KB Output is correct
20 Correct 4 ms 7380 KB Output is correct
21 Correct 4 ms 7372 KB Output is correct
22 Correct 4 ms 7380 KB Output is correct
23 Correct 7 ms 7764 KB Output is correct
24 Correct 6 ms 7764 KB Output is correct
25 Correct 6 ms 7764 KB Output is correct
26 Correct 9 ms 8240 KB Output is correct
27 Correct 8 ms 8148 KB Output is correct
28 Correct 8 ms 8276 KB Output is correct
29 Correct 8 ms 8156 KB Output is correct
30 Correct 7 ms 8148 KB Output is correct
31 Correct 8 ms 8404 KB Output is correct

Subtask #4
43.0 / 43.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 7380 KB Output is correct
2 Correct 4 ms 7380 KB Output is correct
3 Correct 5 ms 7380 KB Output is correct
4 Correct 4 ms 7380 KB Output is correct
5 Correct 4 ms 7380 KB Output is correct
6 Correct 4 ms 7376 KB Output is correct
7 Correct 4 ms 7376 KB Output is correct
8 Correct 4 ms 7380 KB Output is correct
9 Correct 4 ms 7380 KB Output is correct
10 Correct 4 ms 7380 KB Output is correct
11 Correct 4 ms 7380 KB Output is correct
12 Correct 5 ms 7380 KB Output is correct
13 Correct 4 ms 7380 KB Output is correct
14 Correct 4 ms 7380 KB Output is correct
15 Correct 4 ms 7372 KB Output is correct
16 Correct 4 ms 7380 KB Output is correct
17 Correct 5 ms 7376 KB Output is correct
18 Correct 4 ms 7380 KB Output is correct
19 Correct 4 ms 7312 KB Output is correct
20 Correct 4 ms 7380 KB Output is correct
21 Correct 4 ms 7372 KB Output is correct
22 Correct 4 ms 7380 KB Output is correct
23 Correct 7 ms 7764 KB Output is correct
24 Correct 6 ms 7764 KB Output is correct
25 Correct 6 ms 7764 KB Output is correct
26 Correct 9 ms 8240 KB Output is correct
27 Correct 8 ms 8148 KB Output is correct
28 Correct 8 ms 8276 KB Output is correct
29 Correct 8 ms 8156 KB Output is correct
30 Correct 7 ms 8148 KB Output is correct
31 Correct 8 ms 8404 KB Output is correct
32 Correct 29 ms 11544 KB Output is correct
33 Correct 30 ms 11568 KB Output is correct
34 Correct 26 ms 11444 KB Output is correct
35 Correct 168 ms 24528 KB Output is correct
36 Correct 183 ms 24648 KB Output is correct
37 Correct 166 ms 24520 KB Output is correct
38 Correct 102 ms 25036 KB Output is correct
39 Correct 98 ms 23416 KB Output is correct
40 Correct 122 ms 25132 KB Output is correct
41 Correct 153 ms 27768 KB Output is correct