Submission #1043281

#	Time	Username	Problem	Language	Result	Execution time	Memory
1043281		guagua0407	Jobs (BOI24_jobs)	C++17	0 / 100	2057 ms	27860 KiB

Main

//#pragma GCC optimize("O3")
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<int,int>
#define f first
#define s second
#define all(x) x.begin(),x.end()
#define _ ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

int dx[4]={0,0,1,-1};
int dy[4]={1,-1,0,0};

void setIO(string s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}

const int mxn=3e5+5;
vector<int> adj[mxn];
vector<ll> x(mxn);
vector<ll> mn(mxn);
vector<ll> pre(mxn);
vector<bool> used(mxn);

void dfs(int v,int p=-1){
    if(p!=-1 and !used[v]){
        pre[v]=pre[p]+x[v];
        mn[v]=min(mn[p],pre[v]);
    }
    else{
        mn[v]=pre[v]=0;
    }
    for(auto u:adj[v]){
        dfs(u,v);
    }
}

int main() {_
    int n;
    ll S;
    cin>>n>>S;
    vector<int> p(mxn);
    for(int i=1;i<=n;i++){
        cin>>x[i]>>p[i];
        adj[p[i]].push_back(i);
    }
    ll prv=S;
    while(true){
        dfs(0);
        int mx=-1;
        for(int i=0;i<n;i++){
            if(used[i]) continue;
            if(S+mn[i]>=0 and (mx==-1 or pre[i]>pre[mx])){
                mx=i;
            }
        }
        if(mx==-1 or pre[mx]<0) break;
        S+=pre[mx];
        //cout<<mx<<' '<<S<<'\n';
        while(!used[mx]){
            used[mx]=true;
            mx=p[mx];
        }
    }
    cout<<S-prv<<'\n';
    return 0;
}
//maybe its multiset not set
//yeeorz
//laborz

Compilation message (stderr)

Main.cpp: In function 'void setIO(std::string)':
Main.cpp:15:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:16:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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