Submission #1034975

#	Time	Username	Problem	Language	Result	Execution time	Memory
1034975		underwaterkillerwhale	Magic Tree (CEOI19_magictree)	C++17	100 / 100	89 ms	35156 KiB

magictree

#include <bits/stdc++.h>
#define se              second
#define fs              first
#define mp              make_pair
#define pb              push_back
#define ll              long long
#define ii              pair<ll,ll>
#define ld              long double
#define SZ(v)           (int)v.size()
#define ALL(v)          v.begin(), v.end()
#define bit(msk, i)     ((msk >> i) & 1)
#define iter(id, v)     for(auto id : v)
#define rep(i,m,n)      for(int i=(m); i<=(n); i++)
#define reb(i,m,n)      for(int i=(m); i>=(n); i--)
using namespace std;

mt19937_64 rd(chrono :: steady_clock :: now().time_since_epoch().count());
ll Rand(ll l, ll r) { return uniform_int_distribution<ll> (l, r)(rd); }

const int N = 1e5 + 7;
const int Mod = 1e9 + 7;
const int szBL = 320;
const int  INF = 1e9;
const int BASE = 137;

int n, m, K;
int D[N];
ll W[N];
vector<int> ke[N];
map<int, ll> dp[N];
int szC[N];

void dfs (int u, int p) {
    szC[u] = 1;
    int mxV = -1;
    iter (&v, ke[u]) {
        if (v == p) continue;
        dfs(v, u);
        if (mxV == -1 || szC[v] > szC[mxV]) mxV = v;
        szC[u] += szC[v];
    }
    if (mxV != -1) {
        swap(dp[u], dp[mxV]);
    }
    iter (&v, ke[u]) {
        if (v == p || v == mxV) continue;
        iter (&id, dp[v]) {
            dp[u][id.fs] += id.se;
        }
        map<int,ll> ().swap(dp[v]);
    }
    ll val = W[u];
    dp[u][D[u]] += val;
    auto it = dp[u].lower_bound(D[u] + 1);
    while (it != dp[u].end()) {
        if (it->se <= val) {
            val -= it->se;
            it = dp[u].erase(it);
        }
        else {
            it->se -= val;
            break;
        }
    }
}
/*
    (i, dp[i] - dp[i - 1]);


*/

void solution () {
    cin >> n >> m >> K;
    rep (i, 1, n - 1) {
        int u, v;
        cin >> v;
        u = i + 1;
        ke[u].push_back(v);
        ke[v].push_back(u);
    }
    rep (i, 1, m) {
        ll v, d, w;
        cin >> v >> d >> w;
        D[v] = d;
        W[v] = w;
    }
    dfs(1, 0);
    dp[1][K] += 0;
    for(auto it = dp[1].begin(); it != prev(dp[1].end()); ++it) {
        next(it)->se += it->se;
    }
    cout << dp[1][K] <<"\n";
}

#define file(name) freopen(name".inp", "r", stdin); \
freopen(name".out", "w", stdout);

int main () {
//    file("c");
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    ll num_Test = 1;
//    cin >> num_Test;
    while(num_Test--)
        solution();
}
/*
no bug challenge

*/

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