Submission #1258250

#	Time	Username	Problem	Language	Result	Execution time	Memory
1258250		efeg	Jobs (BOI24_jobs)	C++20	0 / 100	19 ms	23712 KiB

Main

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

#define pb push_back
#define all(v) v.begin(),v.end()

typedef tuple<int,int,int> iii; 

int n,s;
vector<int> x,toposort;
vector<vector<int>> adj;  
vector<bool> vis; 
vector<bool> al; 
vector<vector<int>> liste; 

void topo(int node){
    if (vis[node]) return;
    vis[node] = true; 

    for (auto x : adj[node]){
        topo(x); 
    }

    toposort.pb(node); 
}

int dfs(int node){
    if (vis[node]) return 0;
    vis[node] = true; 

    int sm = x[node]; 
    for (auto to : adj[node]){
        int res = dfs(to); 
        sm += res; 
    }

    if (sm > 0) {
        al[node] = true; 
        liste.back().pb(node); 
    }
    return max(sm,0); 
} 


int main(){
    cin >> n >> s; 
    x.assign(n,0); 
    vis.assign(n,false); 
    adj.assign(n+10,vector<int>()); 
    for (int i = 0; i < n; i++) {
        int p; cin >> x[i] >> p; 
        if (p > 0) adj[p-1].pb(i); 
    }

    for (int i = 0; i < n; i++) if (!vis[i]) topo(i); 
    reverse(all(toposort));
    
    vis.assign(n,false); 
    al.assign(n,false); 
    for (auto x : toposort){
        if (vis[x]) continue;
        liste.pb(vector<int>()); 
        dfs(x); 
        reverse(all(liste.back())); 
    }
    priority_queue<iii> pq; 
        
    for (int i = 0; i < liste.size(); i++){
        if (!liste[i].empty()) pq.push({x[liste[i][0]],i,0}); 
    }
    
    int ans = s; 
    while (!pq.empty() && s >= 0){
        int val,i,j; tie(val,i,j) = pq.top(); pq.pop(); 
        if (s + val < 0) break; 
        s += val;
        if (j+1 < liste[i].size()){
            pq.push({x[liste[i][j+1]],i,j+1}); 
        }
        ans = max(ans,s); 
    }

    cout << ans << endl; 
    return 0; 
}

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