Submission #994576

#	Time	Username	Problem	Language	Result	Execution time	Memory
994576		LCJLY	Jobs (BOI24_jobs)	C++14	0 / 100	96 ms	30824 KiB

Main

#include <bits/stdc++.h>
using namespace std;
	
#define int long long 
#define ld long double
#define show(x,y) cout << y << " " << #x << endl;
#define show2(x,y,i,j) cout << y << " " << #x << "  " << j << " " << #i << endl;
#define show3(x,y,i,j,p,q) cout << y << " " << #x << "  " << j << " " << #i << "  " << q << " " << #p << endl;
#define show4(x,y) for(auto it:y) cout << it << " "; cout << #x << endl;
typedef pair<int,int>pii;
typedef pair<int,pii>pi2;
mt19937_64 rng(chrono::system_clock::now().time_since_epoch().count());

vector<int>adj[300005];
int arr[300005];
bool visited[300005];
vector<pii>storage[300005];
vector<pii>component;
int mini=0;
int counter=0;

void dfs(int index){
	counter+=arr[index];
	mini=min(mini,counter);
	visited[index]=true;
	if(counter>0){
		component.push_back({mini,counter});
		//show2(mini,mini,counter,counter);
		counter=0;
		mini=0;
	}
	
	for(auto it:adj[index]){
		if(visited[it]) continue;
		dfs(it);
	}
}

void solve(){	
	int n,m;
	cin >> n >> m;
	
	//show2(n,n,m,m);
	
	int temp,temp2;
	for(int x=1;x<=n;x++){
		cin >> temp >> temp2;
		swap(temp,temp2);
		if(temp!=0){
			adj[temp].push_back(x);
		}
		arr[x]=temp2;
	}
	
	for(int x=1;x<=n;x++){
		if(visited[x]) continue;
		mini=0;
		counter=0;
		dfs(x);
		storage[x]=component;
		component.clear();
	} 
	
	int ptr[n+5];
	memset(ptr,0,sizeof(ptr));
	
	//show(done,2);
	
	priority_queue<pair<pii,int>>pq;
	for(int x=1;x<=n;x++){
		if(!storage[x].empty()){
			pq.push({storage[x][0],x});
		}
	}
	
	while(!pq.empty()){
		//if can absorb then absorb
		pair<pii,int>cur=pq.top();
		pq.pop();
		//show2(m,m,cur.first.first,cur.first.first);
		if(m+cur.first.first>=0){
			m+=cur.first.second;
		}
		else break;
		
		ptr[cur.second]++;
		if(ptr[cur.second]<(int)storage[cur.second].size()){
			pq.push({storage[cur.second][ptr[cur.second]],cur.second});
		}
	}
	
	cout << m;
}
 
int32_t main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	int t=1;
	//cin >> t;
	//freopen("in.txt","r",stdin);
	while(t--){
		solve();
	}
}

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