Submission #1083888

#	Time	Username	Problem	Language	Result	Execution time	Memory
1083888		raczek	Jobs (BOI24_jobs)	C++17	14 / 100	2041 ms	32264 KiB

Main

#include<bits/stdc++.h>
using namespace std;
#ifdef DEBUG
auto&operator <<(auto& o, pair<auto, auto> p) {return o<<"("<<p.first<<", "<<p.second<<")";}
auto operator <<(auto& o, auto x)->decltype(x.end(), o) {o<<"{"; for(auto v : x) o<<v<<", "; return o<<"}";}
#define debug(X) cout<<"["#X"]"<<X<<endl;
#else
#define debug(X) {}
#endif
const long long INF = numeric_limits<long long>::max();
const int MAXN = 2001;
vector<vector<int> > graph(MAXN);
vector<long long> cost(MAXN);
vector<vector<pair<int, long long> > > pool(MAXN);
void dfs(int b)
{
	priority_queue<pair<long long, int> > q;
	for(auto v : graph[b]) {dfs(v); q.push({pool[v].back().second, v});};
	vector<pair<int, long long> > myP = {{cost[b], 0}};
	while(!q.empty())
	{
		auto a = q.top().second;
		q.pop();
		myP.push_back({pool[a].back().first, 0});
		pool[a].pop_back();
		if(pool[a].size() > 0 && pool[a].back().second != INF) q.push({pool[a].back().second, a}); 
	}
	long long checkP = -1, akt = 0;
	for(int i=0;i<myP.size();i++) 
	{
		akt += myP[i].first;
		if(akt >= 0) 
		{
			akt -= myP[i].first;
			for(int j=checkP+1;j<=i;j++) 
			{
				myP[j].second = akt;
				if(myP[j].first >= 0) myP[j].second = 0;
				akt -= myP[j].first;
			}
			checkP = i;
			akt = 0;
		}
	}
	for(int i=checkP+1;i<myP.size();i++) if(myP[i].first < 0) myP[i].second = -INF;
	reverse(myP.begin(), myP.end());
	debug(b);
	debug(myP);
	pool[b] = myP;
}
int32_t main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	long long n, s;
	cin>>n>>s;
	assert(n <= 2000);
	for(int i=1;i<=n;i++)
	{
		long long c, p;
		cin>>c>>p;
		graph[p].push_back(i);
		cost[i] = c;
	}	
	dfs(0);
	long long org = s;
	while(pool[0].size())
	{
		debug(pool[0].back());
		if(pool[0].back().second + s < 0) break;
		if(s + pool[0].back().first >= 0) {s += pool[0].back().first; pool[0].pop_back();}
	}
	cout<<s - org;
}

Compilation message (stderr)

Main.cpp: In function 'void dfs(int)':
Main.cpp:29:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |  for(int i=0;i<myP.size();i++)
      |              ~^~~~~~~~~~~
Main.cpp:45:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |  for(int i=checkP+1;i<myP.size();i++) if(myP[i].first < 0) myP[i].second = -INF;
      |                     ~^~~~~~~~~~~

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