Submission #878347

#	Time	Username	Problem	Language	Result	Execution time	Memory
878347		Mr_Ph	Paths (RMI21_paths)	C++17	100 / 100	380 ms	30928 KiB

Main

#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
typedef long long ll;
using namespace std;
using namespace __gnu_pbds;
template<class x>
using ordered_set = tree<x, null_type,less<x>, rb_tree_tag,tree_order_statistics_node_update>;
ll mod=(ll)1e9+7;
ll mod1=998244353;
///the defines :)
#define endl '\n'
#define vi vector<int>
#define ent(arr) for(int i=0;i<arr.size();i++)cin>>arr[i];
#define all(arr) arr.begin(),arr.end()
#define allr(arr) arr.rbegin(),arr.rend()
#define sz size()
#define int long long
vector<vector<pair<int,int>>>adj;
int n,k;
int length[200002];
pair<int,int> ans[2][200002];
void dfs(int node,int parent,int w)
{
    // cout<<"HI"<<endl;
    pair<int,int>xd= {0,0};
    for(auto i:adj[node])
    {
        if(i.first==parent)
            continue;
        dfs(i.first,node,i.second);
        // mx.first+=w;
        pair<int,int>mx1=ans[0][i.first];
        mx1.first+=i.second;
        if(mx1>ans[0][node])
            ans[1][node]=ans[0][node],ans[0][node]=mx1;
        else
            ans[1][node]=max(mx1,ans[1][node]);
    }
    if(adj[node].sz==1)
    {
        ans[0][node]= {0,node};
    }
    length[ans[0][node].second]+=w;
}
ordered_set<pair<int,int>>st;
int lol;
int fans[200002];
void re(int x)
{
    int pog=st.order_of_key({length[x],x});
    if(pog>=k)lol-=length[x];
    st.erase({length[x],x});
}
void add(int x,bool del)
{
    st.insert({length[x],x});
    int pog=st.order_of_key({length[x],x});
    if(del){
        if(pog>=k)
            lol+=length[x];
        else lol+=(*st.find_by_order(k)).first;
    }
    else{
        if(pog>=k)
        {
            lol+=length[x];
            if(k>0)
            lol-=(*st.find_by_order(k-1)).first;
        }
    }
}
void dfs1(int node,int parent,int w,pair<int,int>prv)
{
    if(parent!=0){
    prv.first+=w;
    int pog=st.order_of_key({length[ans[0][node].second],ans[0][node].second});
    re(ans[0][node].second);
    length[ans[0][node].second]-=w;
    add(ans[0][node].second,pog>=k);
    fans[node]=lol;
    }
    for(auto i:adj[node])
    {
        if(i.first==parent)continue;
        pair<int,int>nxt=prv;
        if(ans[0][i.first].second==ans[0][node].second)
            nxt=max(ans[1][node],nxt);
        else nxt=max(ans[0][node],nxt);
        int pog=st.order_of_key({length[nxt.second],nxt.second});
        re(nxt.second);
        length[nxt.second]+=i.second;
        add(nxt.second,pog>=k);
        dfs1(i.first,node,i.second,nxt);
        pog=st.order_of_key({length[nxt.second],nxt.second});
        re(nxt.second);
        length[nxt.second]-=i.second;
        add(nxt.second,pog>=k);
    }
    if(parent!=0){
    int pog=st.order_of_key({length[ans[0][node].second],ans[0][node].second});
    re(ans[0][node].second);
    length[ans[0][node].second]+=w;
    add(ans[0][node].second,pog>=k);
    }
}
void preprocess() {}
void solve()
{
    cin>>n>>k;
    adj.resize(n+1);
    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);
    for(int i=1; i<=n; i++)
        st.insert({length[i],i});
    int cnt=0;
    k=max(0ll,(int)st.sz-k);
    for(auto i:st)
    {
        //cout<<i.first<<" "<<i.second<<endl;
        if(cnt>=k)
            lol+=i.first;
        cnt++;
    }
      fans[1]=lol;
    dfs1(1,0,0,{0,0});
    for(int i=1;i<=n;i++)cout<<fans[i]<<endl;
}
signed main()
{
    // freopen("meta_game_input.txt","r",stdin);
    // freopen("otput.txt","w",stdout);
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    preprocess();
    //bla();
    int t=1;
    //cin>>t;
    while(t--)
        solve();
}

Compilation message (stderr)

Main.cpp: In function 'void dfs(long long int, long long int, long long int)':
Main.cpp:26:18: warning: variable 'xd' set but not used [-Wunused-but-set-variable]
   26 |     pair<int,int>xd= {0,0};
      |                  ^~

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