Submission #1225157

#	Time	Username	Problem	Language	Result	Execution time	Memory
1225157		kokoxuya	The short shank; Redemption (BOI21_prison)	C++20	20 / 100	357 ms	301636 KiB

prison

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define pb push_back
#define mp make_pair
#define pii pair<int,int>
#define ss second
#define ff first
#define piii pair<int,pii>
#define debu(x) (cerr << #x  << " = "<< x << "\n")
#define debu2(x,y) (cerr << #x  << " = "<< x << " " << #y << " = " << y << "\n")
#define debu3(x,y,z) (cerr << #x  << " = "<< x << " " << #y << " = " << y << " " << #z << " = " << z<< "\n")
#define bitout(x,y) {\
	cerr << #x << " : ";\
	for (int justforbits = y; justforbits >=0; justforbits--)cout << (((1 << justforbits) & x)>=1);\
	cout << "\n";\
}
#define rangeout(j,rangestart,rangeend) {\
	cerr << "outputting" << #j<< ":\n";\
	for (int forrang = rangestart; forrang <= rangeend; forrang++)cerr << j[forrang] << " ";\
	cerr<<"\n";\
}
#define c1 {cerr << "Checkpoint 1! \n\n";cerr.flush();}
#define c2 {cerr << "Checkpoint 2! \n\n";cerr.flush();}
#define c3 {cerr << "Checkpoint 3! \n\n";cerr.flush();}
#define c4 {cerr << "Checkpoint 4! \n\n";cerr.flush();}
#define defN 2000001
vector<int>parent(defN);
vector<set<int>>childlist(defN);
vector<priority_queue<pii>>childlist2(defN);
vector<bool>riot(defN,true);
vector<int>mydepth(defN);

int dfs(int cn,int cd)
{
	int currmax=mydepth[cn]=cd;
	for(auto x=childlist[cn].begin();x!=childlist[cn].end();x++)
	{
		int curr=dfs(*x,cd+1);
		currmax=max(curr,currmax);
		childlist2[cn].push(mp(curr,*x));
	}
	return currmax;
}

void godown(int cn,	priority_queue<pii> &trees)
{
	riot[cn]=false;
	if(!childlist2[cn].empty())
	{
		int to=childlist2[cn].top().ss;
		childlist2[cn].pop();
		godown(to,trees);
	}
	while(!childlist2[cn].empty())
	{
		trees.push(mp(childlist2[cn].top().ff-mydepth[cn]+1,childlist2[cn].top().ss));
		childlist2[cn].pop();
	}
}

signed main()
{
    int t1,t2,t3,t4;
    mt19937_64 rnd(chrono::high_resolution_clock::now().time_since_epoch().count());
    //ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	
	int n,d,t;cin>>n>>d>>t;	
	
	priority_queue<piii,vector<piii>,greater<piii>>pq;
	for(int a=1;a<=n;a++)
	{
		cin>>t1;
		if(t1<=t)pq.push(mp(a,mp(a+(t-t1),a)));
	}
	
	set<int>curr;
	priority_queue<pii,vector<pii>,greater<pii>>ends;
	vector<int>foreach(n+1,0);
	int tots=0;
	
	for(int a=1;a<=n;a++)
	{
		while(!pq.empty()&&pq.top().ff<=a)
		{
			curr.insert(pq.top().ss.ss);
			ends.push(pq.top().ss);
			pq.pop();
		}
		while(!ends.empty()&&ends.top().ff<a)
		{
			curr.erase(ends.top().ss);
			ends.pop();
		}
		
		if(!curr.empty())
		{
			tots++;
			foreach[a]=(*prev(curr.end()));
		}
	}	
	
	//new : build that treeeeee! :D
	//tis a bracket sequence 
	
	stack<int>opens;
	for(int a=1;a<=n;a++)
	{
		if(foreach[a]==a){continue;}
		if(foreach[a]==0){riot[a]=false;continue;}
		
		while(!opens.empty()&&opens.top()>foreach[a])
		{
			parent[opens.top()]=a;
			childlist[a].insert(opens.top());
			opens.pop();
		}
		opens.push(a);
	}
	
	priority_queue<pii>trees;
	while(!opens.empty())
	{
		int cm=dfs(opens.top(),1);
		trees.push(mp(cm,opens.top()));
		opens.pop();
	}
	
	for(int a=1;a<=d;a++)
	{
		//for each mattress break one path...
		if(trees.empty())break;
		t1=trees.top().ss;
		trees.pop();
		godown(t1,trees);
	}
	
	int ans=0;
	for(int a=1;a<=n;a++){if(riot[a])ans++;}
	cout<<ans;
}

• Subtask 1: 0 / 15
• Subtask 2: 10 / 10
• Subtask 3: 0 / 20
• Subtask 4: 10 / 10
• Subtask 5: 0 / 25
• Subtask 6: 0 / 20