Submission #884920

#	Time	Username	Problem	Language	Result	Execution time	Memory
884920		HossamHero7	Parkovi (COCI22_parkovi)	C++14	30 / 110	1769 ms	43528 KiB

Main

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define endl '\n'
const int N = 2e5 + 5;
vector<pair<int,ll>> adj[N];
pair<int,ll> P[N];
vector<pair<int,int>> leaves;
void dfs(int node,int par,int dep){
    if(adj[node].size() == 1 && node != 1) leaves.push_back({dep,node});
    for(auto [ch,c] : adj[node]){
        if(ch == par) continue;
        P[ch] = {node,c};
        dfs(ch,node,dep+1);
    }
}
void solve(){
    int n,k;
    cin>>n>>k;
    for(int i=0;i<n-1;i++){
        int a,b,c;
        cin>>a>>b>>c;
        adj[a].push_back({b,c});
        adj[b].push_back({a,c});
    }
    dfs(1,0,0);
    ll l = 1;
    ll r = 1e18;
    ll ans = 0;
    vector<int> v;
    while(l <= r){
        ll md = l + r >> 1;
        priority_queue<pair<int,int>> q;
        vector<bool> vis(n+1);
        for(auto i : leaves) q.push(i) , vis[i.second] = 1;
        vector<ll> cost(n+1);
        vector<ll> covered(n+1,1e18);
        vector<int> tmp;
        while(q.size()){
            auto [dep,node] = q.top();       q.pop();
            auto [par,c] = P[node];
            if(covered[node] <= md){
                //cout<<"A "<<node<<' '<<covered[node]<<' '<<cost[node]<<endl;
                covered[par] = min(covered[par] , covered[node] + c);
                if(!vis[par] && par) q.push({dep-1,par}) , vis[par] = 1;
            }
            else {
                if(covered[par] <= md){
                    if(covered[par] + cost[node] + c <= md) {
                        if(!vis[par] && par) q.push({dep-1,par}) , vis[par] = 1;
                    }
                    else {
                        tmp.push_back(node);
                        if(!vis[par] && par) q.push({dep-1,par}) , vis[par] = 1;
                    }
                }
                else {
                    if(cost[node] + c <= md){
                        //cout<<"B1 "<<node<<' '<<covered[node]<<' '<<cost[node]<<endl;
                        cost[par] = max(cost[par],cost[node] + c);
                        if(!vis[par] && par) q.push({dep-1,par}) , vis[par] = 1;
                    }
                    else {
                        tmp.push_back(node);
                        covered[par] = min(covered[par] , c);
                        if(!vis[par] && par) q.push({dep-1,par}) , vis[par] = 1;
                    }
                }
            }
        }
        if((tmp.empty() || tmp.back() != 1) && covered[1] > md) tmp.push_back(1);
        if(tmp.size() <= k){
            ans = md;
            v = tmp;
            r = md - 1;
        }
        else l = md + 1;
    }
    cout<<ans<<endl;
    vector<bool> vis(n+1);
    for(auto i : v) vis[i] = 1;
    for(int i=1;i<=n&&v.size()!=k;i++){
        if(!vis[i]) v.push_back(i);
    }
    for(auto i : v) cout<<i<<' ';
    cout<<endl;
}
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);      cout.tie(0);
    int t=1;
    //cin>>t;
    while(t--){
        solve();
    }
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'void dfs(int, int, int)':
Main.cpp:11:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   11 |     for(auto [ch,c] : adj[node]){
      |              ^
Main.cpp: In function 'void solve()':
Main.cpp:32:19: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   32 |         ll md = l + r >> 1;
      |                 ~~^~~
Main.cpp:40:18: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   40 |             auto [dep,node] = q.top();       q.pop();
      |                  ^
Main.cpp:41:18: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   41 |             auto [par,c] = P[node];
      |                  ^
Main.cpp:72:23: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   72 |         if(tmp.size() <= k){
      |            ~~~~~~~~~~~^~~~
Main.cpp:82:31: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   82 |     for(int i=1;i<=n&&v.size()!=k;i++){
      |                       ~~~~~~~~^~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 30 / 30
• Subtask 4: 0 / 60