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Submission #363123

# Submission time Handle Problem Language Result Execution time Memory
363123 2021-02-05T05:31:39 Z ijxjdjd Beads and wires (APIO14_beads) C++14
57 / 100
 383 ms 44000 KB 
#include <bits/stdc++.h>
#define FR(i, N) for (int i = 0; i < int(N); i++)
#define all(x) begin(x), end(x)

#define f first
#define s second
using namespace std;

using ll = long long;

const int MAXN = (int)(2e5) + 5;
vector<pair<int, int>> adj[MAXN];
int dp[MAXN][2];
multiset<int> trans[MAXN];
int sm[MAXN];
void dfs(int n, int p, int w) {
    int allSum = 0;
    for (auto& e : adj[n]) {
        if (e.f != p) {
            dfs(e.f, n, e.s);
            trans[n].insert(e.s + dp[e.f][0] - dp[e.f][1]);
            allSum += dp[e.f][1];
        }
    }
    sm[n] = allSum;
    dp[n][0] = allSum;
    dp[n][1] = allSum + (trans[n].size() > 0 ? max(0, *trans[n].rbegin() + w): 0);
}

int ans = 0;
void sol(int n, int p) {
    ans = max(dp[n][0], ans);
    if (trans[n].size() >= 2) {
        ans = max(ans, dp[n][0] + *trans[n].rbegin() + *next(trans[n].rbegin()));
    }
    ans = max(ans, dp[n][0]);
    for (auto e : adj[n]) {
        if (e.f != p) {
            int orin0 = dp[n][0];
            int orin1 = dp[n][1];
            int orinsm = sm[n];
            trans[n].erase(e.s + dp[e.f][0] - dp[e.f][1]);
            sm[n] -= dp[e.f][1];
            dp[n][0] = sm[n];
            dp[n][1] = sm[n] + (trans[n].size() > 0 ? max(0, *trans[n].rbegin() + e.s): 0);
            int orie0 = dp[e.f][0];
            int orie1 = dp[e.f][1];
            int oriesm = sm[e.f];
            sm[e.f] += dp[n][1];
            dp[e.f][0] = sm[e.f];
            dp[e.f][1] = sm[e.f] + (trans[e.f].size() > 0 ? max(0, *trans[e.f].rbegin() + e.s): 0);
            trans[e.f].insert(e.s + dp[n][0] - dp[n][1]);
            sol(e.f, n);
            trans[e.f].erase(e.s + dp[n][0] - dp[n][1]);
            sm[n] = orinsm;
            dp[n][0] = orin0;
            dp[n][1] = orin1;
            dp[e.f][0] = orie0;
            dp[e.f][1] = orie1;
            sm[e.f] = oriesm;
            trans[n].insert(e.s + dp[e.f][0] - dp[e.f][1]);
        }
    }
}
int main() {
//    freopen("input.in", "r", stdin);
	cin.tie(0);
	cin.sync_with_stdio(0);
	int N;
	cin >> N;
	FR(i, N-1) {
        int u, v, w;
        cin >> u >> v >> w;
        u--, v--;
        adj[u].push_back({v, w});
        adj[v].push_back({u, w});
	}
	dfs(0, 0, 0);
	sol(0, 0);
	cout << ans << '\n';
	return 0;
}

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 14444 KB Output is correct
2 Correct 10 ms 14572 KB Output is correct
3 Correct 11 ms 14444 KB Output is correct
4 Correct 10 ms 14444 KB Output is correct
5 Correct 10 ms 14444 KB Output is correct
6 Correct 10 ms 14444 KB Output is correct
7 Correct 10 ms 14444 KB Output is correct
8 Correct 10 ms 14444 KB Output is correct
9 Correct 10 ms 14444 KB Output is correct
10 Correct 10 ms 14444 KB Output is correct
11 Correct 10 ms 14444 KB Output is correct
12 Correct 10 ms 14444 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 14444 KB Output is correct
2 Correct 10 ms 14572 KB Output is correct
3 Correct 11 ms 14444 KB Output is correct
4 Correct 10 ms 14444 KB Output is correct
5 Correct 10 ms 14444 KB Output is correct
6 Correct 10 ms 14444 KB Output is correct
7 Correct 10 ms 14444 KB Output is correct
8 Correct 10 ms 14444 KB Output is correct
9 Correct 10 ms 14444 KB Output is correct
10 Correct 10 ms 14444 KB Output is correct
11 Correct 10 ms 14444 KB Output is correct
12 Correct 10 ms 14444 KB Output is correct
13 Correct 10 ms 14444 KB Output is correct
14 Correct 10 ms 14444 KB Output is correct
15 Correct 10 ms 14444 KB Output is correct
16 Correct 10 ms 14444 KB Output is correct
17 Correct 10 ms 14444 KB Output is correct
18 Correct 10 ms 14444 KB Output is correct
19 Correct 10 ms 14444 KB Output is correct
20 Correct 10 ms 14444 KB Output is correct
21 Correct 10 ms 14444 KB Output is correct
22 Correct 10 ms 14444 KB Output is correct

Subtask #3
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 14444 KB Output is correct
2 Correct 10 ms 14572 KB Output is correct
3 Correct 11 ms 14444 KB Output is correct
4 Correct 10 ms 14444 KB Output is correct
5 Correct 10 ms 14444 KB Output is correct
6 Correct 10 ms 14444 KB Output is correct
7 Correct 10 ms 14444 KB Output is correct
8 Correct 10 ms 14444 KB Output is correct
9 Correct 10 ms 14444 KB Output is correct
10 Correct 10 ms 14444 KB Output is correct
11 Correct 10 ms 14444 KB Output is correct
12 Correct 10 ms 14444 KB Output is correct
13 Correct 10 ms 14444 KB Output is correct
14 Correct 10 ms 14444 KB Output is correct
15 Correct 10 ms 14444 KB Output is correct
16 Correct 10 ms 14444 KB Output is correct
17 Correct 10 ms 14444 KB Output is correct
18 Correct 10 ms 14444 KB Output is correct
19 Correct 10 ms 14444 KB Output is correct
20 Correct 10 ms 14444 KB Output is correct
21 Correct 10 ms 14444 KB Output is correct
22 Correct 10 ms 14444 KB Output is correct
23 Correct 14 ms 14956 KB Output is correct
24 Correct 14 ms 14956 KB Output is correct
25 Correct 14 ms 14956 KB Output is correct
26 Correct 19 ms 15596 KB Output is correct
27 Correct 18 ms 15596 KB Output is correct
28 Correct 20 ms 15616 KB Output is correct
29 Correct 25 ms 15596 KB Output is correct
30 Correct 20 ms 15596 KB Output is correct
31 Correct 19 ms 16108 KB Output is correct

Subtask #4
0 / 43.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 14444 KB Output is correct
2 Correct 10 ms 14572 KB Output is correct
3 Correct 11 ms 14444 KB Output is correct
4 Correct 10 ms 14444 KB Output is correct
5 Correct 10 ms 14444 KB Output is correct
6 Correct 10 ms 14444 KB Output is correct
7 Correct 10 ms 14444 KB Output is correct
8 Correct 10 ms 14444 KB Output is correct
9 Correct 10 ms 14444 KB Output is correct
10 Correct 10 ms 14444 KB Output is correct
11 Correct 10 ms 14444 KB Output is correct
12 Correct 10 ms 14444 KB Output is correct
13 Correct 10 ms 14444 KB Output is correct
14 Correct 10 ms 14444 KB Output is correct
15 Correct 10 ms 14444 KB Output is correct
16 Correct 10 ms 14444 KB Output is correct
17 Correct 10 ms 14444 KB Output is correct
18 Correct 10 ms 14444 KB Output is correct
19 Correct 10 ms 14444 KB Output is correct
20 Correct 10 ms 14444 KB Output is correct
21 Correct 10 ms 14444 KB Output is correct
22 Correct 10 ms 14444 KB Output is correct
23 Correct 14 ms 14956 KB Output is correct
24 Correct 14 ms 14956 KB Output is correct
25 Correct 14 ms 14956 KB Output is correct
26 Correct 19 ms 15596 KB Output is correct
27 Correct 18 ms 15596 KB Output is correct
28 Correct 20 ms 15616 KB Output is correct
29 Correct 25 ms 15596 KB Output is correct
30 Correct 20 ms 15596 KB Output is correct
31 Correct 19 ms 16108 KB Output is correct
32 Correct 70 ms 19960 KB Output is correct
33 Correct 70 ms 20076 KB Output is correct
34 Correct 66 ms 20076 KB Output is correct
35 Correct 364 ms 37100 KB Output is correct
36 Correct 362 ms 37228 KB Output is correct
37 Correct 366 ms 37228 KB Output is correct
38 Correct 332 ms 37596 KB Output is correct
39 Correct 326 ms 37528 KB Output is correct
40 Correct 336 ms 37460 KB Output is correct
41 Incorrect 383 ms 44000 KB Output isn't correct