Submission #716532

#	Time	Username	Problem	Language	Result	Execution time	Memory
716532		Stickfish	Paths (RMI21_paths)	C++17	56 / 100	1069 ms	34636 KiB

Main

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
using ll = long long;

struct node {
    node* l = nullptr;
    node* r = nullptr;
    ll val = 0;
    ll sm = 0;
};

node* copy(node* nd) {
    node* v = new node();
    v->l = nd->l;
    v->r = nd->r;
    v->val = nd->val;
    return v;
}

node* merge(node* l, node* r) {
    if (!l)
        return r;
    if (!r)
        return l;
    
}

const int MAXN = 1e5 + 123;
vector<pair<int, int>> edg[MAXN];
ll cost[MAXN * 3];
pair<int, int> edges[MAXN * 3];
vector<ll> dp[MAXN * 3];

void get_dp(int e, int k) {
    if (dp[e].size())
        return;
    auto [rt, v] = edges[e];
    if (k == 1)
        dp[e] = {0};
    for (auto [u, ne] : edg[v]) {
        if (u == rt)
            continue;
        get_dp(ne, k);
        if (k == 1) {
            dp[e][0] = max(dp[e][0], dp[ne][0]);
            continue;
        }
        vector<ll> ndp(dp[e].size() + dp[ne].size());
        merge(dp[e].rbegin(), dp[e].rend(), dp[ne].rbegin(), dp[ne].rend(), ndp.rbegin());
        ndp.resize(min(int(ndp.size()), k));
        dp[e] = ndp;
    }
    if (dp[e].empty()) {
        dp[e] = {cost[e]};
    } else {
        dp[e][0] += cost[e];
    }
}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    int n, k;
    cin >> n >> k;
    for (int i = 0; i + 1 < n; ++i) {
        int u, v, c;
        cin >> u >> v >> c;
        --u, --v;
        edg[u].push_back({v, i * 2});
        edg[v].push_back({u, i * 2 + 1});
        edges[i * 2] = {u, v};
        edges[i * 2 + 1] = {v, u};
        cost[i * 2] = cost[i * 2 + 1] = c;
    }
    for (int e = 2 * n; e < 3 * n; ++e) {
        edges[e] = {n, e - 2 * n};
        get_dp(e, k);
        ll ans = 0;
        for (auto x : dp[e])
            ans += x;
        cout << ans << '\n';
    }
    //for (int e = 0; e < n * 2 - 1; ++e)
        //get_dp(e, k);
    //for (int v = 0; v < n; ++v) {
        //vector<ll> ans;
        //for (auto [u, e] : edg[v]) {
            //vector<ll> ndp(ans.size() + dp[e].size());
            //merge(dp[e].rbegin(), dp[e].rend(), ans.rbegin(), ans.rend(), ndp.rbegin());
            //ndp.resize(min(int(ndp.size()), k));
            //ans = ndp;
        //}
        //ll anssm = 0;
        //for (auto x : ans)
            //anssm += x;
        //cout << anssm << '\n';
    //}
}

Compilation message (stderr)

Main.cpp: In function 'node* merge(node*, node*)':
Main.cpp:28:1: warning: control reaches end of non-void function [-Wreturn-type]
   28 | }
      | ^

• Subtask 1: 8 / 8
• Subtask 2: 11 / 11
• Subtask 3: 17 / 17
• Subtask 4: 20 / 20
• Subtask 5: 0 / 12
• Subtask 6: 0 / 32