제출 #1109967

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1109967		ljtunas	Magic Tree (CEOI19_magictree)	C++17	3 / 100	110 ms	83004 KiB

magictree

// author : anhtun_hi , nqg
#include <bits/stdc++.h>
#define ll long long
#define ii pair<ll, ll>
#define fi first
#define se second
#define all(x) x.begin(), x.end()
#define reset(h, v)    memset(h, v, sizeof h)
#define Forv(i, a)     for(auto& i : a)
#define For(i, a, b)   for(int i = a; i <= b; ++i)
#define Ford(i, a, b)  for(int i = a; i >= b; --i)
#define c_bit(i)     __builtin_popcountll(i)
#define Bit(mask, i)    ((mask >> i) & 1LL)
#define onbit(mask, i)  ((mask) bitor (1LL << i))
#define offbit(mask, i) ((mask) &~ (1LL << i))
using namespace std;
namespace std {
    template <typename T, int D>
    struct _vector : public vector <_vector <T, D - 1>> {
        static_assert(D >= 1, "Dimension must be positive!");
        template <typename... Args>
        _vector(int n = 0, Args... args) : vector <_vector <T, D - 1>> (n, _vector <T, D - 1> (args...)) {}
    };
    template <typename T> struct _vector <T, 1> : public vector <T> {
        _vector(int n = 0, const T& val = T()) : vector <T> (n, val) {}
    };
    template <class A, class B> bool minimize(A &a, B b){return a > b ? a = b, true : false;}
    template <class A, class B> bool maximize(A &a, B b){return a < b ? a = b, true : false;}
}
const int dx[] = {0, 0, +1, -1}, dy[] = {-1, +1, 0, 0}, LOG = 20, base = 311, inf = 1e9 + 5;
const int MAXN = 1e6 + 5;
const  ll  mod = 1e9 + 7;
const  ll   oo = 1e18;

//#define int long long
int n, m, k; vector<int> g[MAXN];

ii c[MAXN];

map<int, ll> mp[MAXN]; bool ok[MAXN];

void dfs(int u, int par){
    Forv(v, g[u]) if(v ^ par){
        dfs(v, u);
        if(mp[u].size() < mp[v].size()) swap(mp[u], mp[v]);
        Forv(tmp, mp[v]) mp[u][tmp.fi] += tmp.se;
        mp[v].clear();
    }
    if (ok[u]){
        auto [day, w] = c[u];
        mp[u][day] += w;
        auto it = mp[u].upper_bound(day);
        while (it != mp[u].end()){
            if (it->se >= w){
                mp[u].erase(mp[u].lower_bound(day));
                break;
            }
            auto cur = it; ++it;
            mp[u].erase(cur);
        }
    }
}

void Solve() {
    cin >> n >> m >> k;
    For(i, 2, n){
        int p; cin >> p; g[p].push_back(i);
    }
    For(i, 1, m){
        int node, day, w;
        cin >> node >> day >> w;
        c[node] = {day, w};
        ok[node] = true;
    }
    dfs(1, 0);
    ll ans = 0;
    for(auto [_, w] : mp[1]) ans += w;
    cout << ans << '\n';
}

int32_t main() {
    cin.tie(0) -> sync_with_stdio(0);
    if(fopen("CEOI19_magictree.inp", "r")) {
        freopen("CEOI19_magictree.inp", "r", stdin);
        freopen("CEOI19_magictree.out", "w", stdout);
    }

    int t = 1;
//    cin >> t;

    for (int test = 1; test <= t; test++) {
        Solve();
    }
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

magictree.cpp: In function 'int32_t main()':
magictree.cpp:84:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   84 |         freopen("CEOI19_magictree.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
magictree.cpp:85:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   85 |         freopen("CEOI19_magictree.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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