Submission #242237

#	Time	Username	Problem	Language	Result	Execution time	Memory
242237		lyc	Magic Tree (CEOI19_magictree)	C++14	3 / 100	143 ms	13944 KiB

magictree

#include <bits/stdc++.h>
using namespace std;

#define TRACE(x) cerr << #x << " :: " << x << endl
#define _ << " " <<
#define SZ(x) (int)(x).size()
#define ALL(x) (x).begin(),(x).end()
#define FOR(i,a,b) for(int i=(a);i<=(b);++i)
#define RFOR(i,a,b) for (int i=(a);i>=(b);--i)
using ll=long long;
using ii=pair<int,int>;
using pll=pair<ll,ll>;

const int mxN = 1e5+5;
const int mxM = mxN;
const int mxK = 1e5+5;

int N, M, K;
vector<int> al[mxN];
ii fruit[mxN];

set<ii> dfs(int u) {
    set<ii> cur;
    for (int v : al[u]) {
        auto x = dfs(v);
        if (SZ(cur) < SZ(x)) swap(cur,x);
        for (auto y : x) cur.insert(y);
    }
    if (fruit[u] != ii(-1,-1)) {
        ll sum = 0;
        for (auto it = cur.rbegin(); it != cur.rend() && it->first > fruit[u].first; ++it) {
            sum += it->second;
        }
        if (fruit[u].second >= sum) {
            for (auto it = cur.rbegin(); it != cur.rend() && it->first > fruit[u].first;) {
                auto jt = next(it);
                assert(cur.find(*it) != cur.end());
                cur.erase(cur.find(*it));
                it = jt;
            }
            cur.insert(fruit[u]);
        }
    }
    return cur;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cin >> N >> M >> K;
    FOR(i,2,N){
        int P; cin >> P;
        al[P].push_back(i);
    }
    FOR(i,1,N) fruit[i] = ii(-1,-1);
    FOR(i,1,M){
        int V, D, W; cin >> V >> D >> W;
        fruit[V] = ii(D,W);
    }
    auto ans = dfs(1);
    ll sum = 0;
    for (auto& x : ans) {
        sum += x.second;
    }
    cout << sum << '\n';
}

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