Submission #1029075

#	Time	Username	Problem	Language	Result	Execution time	Memory
1029075		Otalp	Jobs (BOI24_jobs)	C++14	11 / 100	247 ms	43088 KiB

Main

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<int, int>
#define pb push_back
#define ff first
#define ss second


vector<int> q[300100];
ll a[300100];
ll dp[300100][2];
ll kto[300100];
int us[300100];

void dfs(int v, int p){
    dp[v][0] = a[v];
    dp[v][1] = 0;
    for(int to: q[v]){
        if(to == p) continue;
        dfs(to, v);
        dp[v][0] += dp[to][0];
        dp[v][1] += dp[to][1];
    }
    if(dp[v][1] > dp[v][0]) kto[v] = 0;
    else kto[v] = 1;
    dp[v][1] = min(dp[v][1], dp[v][0]);
}


void dfs2(int v, int p, int k){
    if(k == 1){ 
        k = kto[v];
    }
    us[v] = k;
    for(int to: q[v]){
        if(to == p) continue;
        dfs2(to, v, k);
    }
}
        





void solve(){
    ll n, s;
    cin>>n>>s;
    ll ans = s;
    for(int i=1; i<=n; i++){
        int l, r;
        cin>>l>>r;
        q[r].pb(i);
        q[i].pb(r);
        a[i] = l;
        ans += a[i];
    }
    dfs(0, -1);
    dfs2(0, -1, 1);
    ans = 0;
    for(int i=0; i<=n; i++){
        ans += a[i] * us[i];
    }
    cout<<ans;


}

signed main(){
    solve();
}

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