oj.uz

답안 #752966

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
752966 2023-06-04T11:15:31 Z benjaminkleyn Fireworks (APIO16_fireworks) C++17
7 / 100
 5 ms 7380 KB 
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

const int MAX = 300010;
int n, m;
int p[2 * MAX]; 
ll c[2 * MAX];
vector<pair<int, ll>> g[MAX];

struct state
{
    ll cost, dist, free_increase;
};

state dp(int u)
{
    if (u > n)
        return {0, 0, 0};

    ll res = 0;
    vector<ll> T;
    ll min_val = 0;
    ll free_increase = LLONG_MAX;
    for (auto [v, l] : g[u])
    {
        auto [t, d, free] = dp(v);
        res += t;
        T.push_back(l + d);
        free_increase = min(free_increase, free);
        min_val = max(min_val, d);
    }
    sort(T.begin(), T.end());

    ll best = T[(T.size() - 1) / 2], free = T[T.size()/2] - T[(T.size()-1)/2];
    if (min_val >= T[T.size()/2])
        best = min_val, free = 0;
    else if (min_val >= best)
        best = min_val, free = T[T.size()/2] - min_val;
    for (ll x : T)
        res += abs(best - x);
    return {res - free_increase, best, free};
}

int main()
{
    cin.tie(0)->sync_with_stdio(0);

    cin >> n >> m;
    p[1] = -1, c[1] = 0;
    for (int i = 2; i <= n + m; i++)
    {
        cin >> p[i] >> c[i];
        g[p[i]].push_back({i, c[i]});
    }

    cout << dp(1).cost << '\n';

    return 0;
}

Subtask #1
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 7380 KB Output is correct
2 Correct 5 ms 7380 KB Output is correct
3 Correct 4 ms 7380 KB Output is correct
4 Correct 4 ms 7380 KB Output is correct
5 Correct 4 ms 7380 KB Output is correct
6 Correct 4 ms 7380 KB Output is correct
7 Correct 4 ms 7380 KB Output is correct
8 Correct 4 ms 7380 KB Output is correct
9 Correct 4 ms 7380 KB Output is correct
10 Correct 4 ms 7380 KB Output is correct

Subtask #2
0 / 19.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 3 ms 7380 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 29.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 7380 KB Output is correct
2 Correct 5 ms 7380 KB Output is correct
3 Correct 4 ms 7380 KB Output is correct
4 Correct 4 ms 7380 KB Output is correct
5 Correct 4 ms 7380 KB Output is correct
6 Correct 4 ms 7380 KB Output is correct
7 Correct 4 ms 7380 KB Output is correct
8 Correct 4 ms 7380 KB Output is correct
9 Correct 4 ms 7380 KB Output is correct
10 Correct 4 ms 7380 KB Output is correct
11 Incorrect 3 ms 7380 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #4
0 / 45.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 7380 KB Output is correct
2 Correct 5 ms 7380 KB Output is correct
3 Correct 4 ms 7380 KB Output is correct
4 Correct 4 ms 7380 KB Output is correct
5 Correct 4 ms 7380 KB Output is correct
6 Correct 4 ms 7380 KB Output is correct
7 Correct 4 ms 7380 KB Output is correct
8 Correct 4 ms 7380 KB Output is correct
9 Correct 4 ms 7380 KB Output is correct
10 Correct 4 ms 7380 KB Output is correct
11 Incorrect 3 ms 7380 KB Output isn't correct
12 Halted 0 ms 0 KB -