Submission #1189934

#	Time	Username	Problem	Language	Result	Execution time	Memory
1189934		anmattroi	Jobs (BOI24_jobs)	C++17	11 / 100	71 ms	31812 KiB

Main

#include <bits/stdc++.h>
#define maxn 300005
using namespace std;

int n;
int64_t s;
int c[maxn], p[maxn], start[maxn], stop[maxn], id = -1, euler[maxn];
int64_t sum[maxn], dp[maxn];

vector<int> adj[maxn];

void dfs(int u) {
    start[u] = ++id;
    euler[id] = u;
    sum[u] += c[u];
    for (int v : adj[u]) {
        dfs(v);
        sum[u] += sum[v];
    }
    stop[u] = id;
}


int main() {
    ios::sync_with_stdio(false);
    cin.tie(NULL);

    cin >> n >> s;
    for (int i = 1; i <= n; i++) cin >> c[i] >> p[i];
    for (int i = 1; i <= n; i++) adj[p[i]].emplace_back(i);
    dfs(0);

    int64_t ans = 0;
    for (int i = 1; i <= n; i++) ans += c[i];
    for (int i = n; i >= 0; i--) dp[i] = max(dp[stop[euler[i]]+1] - sum[euler[i]], dp[i+1]);


    cout << ans + dp[0];

}
/*
6 1
3 0
-3 1
-5 0
2 1
6 3
-4 5

6
*/

• Subtask 1: 11 / 11
• Subtask 2: 0 / 14
• Subtask 3: 0 / 15
• Subtask 4: 0 / 29
• Subtask 5: 0 / 31