Submission #898987

#	Time	Username	Problem	Language	Result	Execution time	Memory
898987		alexdd	Magic Tree (CEOI19_magictree)	C++17	47 / 100	2097 ms	294416 KiB

magictree

#include<bits/stdc++.h>
using namespace std;
const long long INF = 1e18;
const int maxn = 1e5;
int n,m,k;
int parent[maxn+5];
int w[maxn+5];
int day[maxn+5];
vector<int> con[maxn+5];

vector<pair<int,long long>> rez[maxn+5];///{zi,suc}

long long getrez(int nod, int zi)
{
    if(rez[nod].empty())
        return 0;
    pair<int,long long> aux = {zi,INF};
    auto it = lower_bound(rez[nod].begin(),rez[nod].end(),aux);
    if(it==rez[nod].begin())
        return 0;
    it--;
    pair<int,long long> cop = *it;
    return cop.second;
}

void dfs(int nod)
{
    map<int,int> calc;
    for(auto adj:con[nod])
    {
        dfs(adj);
        for(auto x:rez[adj])
            calc[x.first]++;
    }
    if(day[nod]!=0) calc[day[nod]]++;
    long long mxm=0;
    for(auto it:calc)
    {
        pair<int,long long> aux = {it.first, 0};
        if(aux.first == day[nod])
            aux.second += w[nod];
        for(auto adj:con[nod])
        {
            aux.second += getrez(adj, aux.first);
        }
        if(aux.second > mxm)
        {
            mxm = aux.second;
            rez[nod].push_back(aux);
        }
    }
}
signed main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);
    cin>>n>>m>>k;
    for(int i=2;i<=n;i++)
    {
        cin>>parent[i];
        con[parent[i]].push_back(i);
    }
    int a;
    for(int i=1;i<=m;i++)
    {
        cin>>a;
        cin>>day[a]>>w[a];
    }
    dfs(1);
    cout<<rez[1].back().second;
    return 0;
}
/**


*/

• Subtask 1: 6 / 6
• Subtask 2: 0 / 3
• Subtask 3: 0 / 11
• Subtask 4: 12 / 12
• Subtask 5: 16 / 16
• Subtask 6: 13 / 13
• Subtask 7: 0 / 22
• Subtask 8: 0 / 17