Submission #571926

#	Time	Username	Problem	Language	Result	Execution time	Memory
571926		blue	Santa Claus (RMI19_santa)	C++17	0 / 100	1095 ms	6644 KiB

santa

#include <iostream>
#include <vector>
#include <set>
using namespace std;

const int mx = 100'000;

using vi = vector<int>;
using pii = pair<int, int>;

struct segtree
{
	vi l = vi((1<<18) + 1);
	vi r = vi((1<<18) + 1);

	vi mn = vi((1<<18) + 1, 0); //change to long long if error
	vi lp = vi((1<<18) + 1, 0);

	void build(int i, int L, int R)
	{
		l[i] = L;
		r[i] = R;

		mn[i] = lp[i] = 0;

		if(l[i] == r[i])
			return;

		int m = (l[i] + r[i])/2;
		build(2*i, l[i], m);
		build(2*i+1, m+1, r[i]);
	}

	void add(int i, int L, int R, int V)
	{
		if(r[i] < L || R < l[i])
			return;

		// cerr << "add " << i << ' ' << l[i] << ' ' << r[i] << " : " << L << ' ' << R << ' ' << V << '\n'; 

		if(L <= l[i] && r[i] <= R)
		{
			lp[i] += V;
			mn[i] += V;
		}
		else
		{
			add(2*i, L, R, V);
			add(2*i+1, L, R, V);
			mn[i] = lp[i] + min(mn[2*i], mn[2*i+1]);
		}
	}

	int rangemin(int i, int L, int R)
	{
		// cerr << "rangemin " << i << ' ' << l[i] << ' ' << r[i] << " : " << L << ' ' << R << '\n';
		if(r[i] < L || R < l[i])
		{
			// cerr << "case 1\n";
			return 1'000'000'000;
		}
		else if(L <= l[i] && r[i] <= R)
		{
			// cerr << "case 2\n";
			return mn[i];
		}
		else
		{
			// cerr << "case 3\n";
			return lp[i] + min(rangemin(2*i, L, R), rangemin(2*i+1, L, R));
		}
	}
};

int N;

segtree S;

vi X, H, V;

multiset<int> elves, children;

void output()
{
	for(int i = 0; i <= N; i++)
		cerr << S.rangemin(1, i, i) << ' ';
	cerr << '\n';
}

void addelf(int i)
{
	// cerr << "add elf " << i << '\n';
	// elves.insert(i);
	S.add(1, i, N, -1);

	// output();
}

void removeelf(int i)
{
	// cerr << "remove elf " << i << '\n';
	// elves.erase(elves.find(i));
	S.add(1, i, N, +1);

	// output();
}

void addchild(int i)
{
	// cerr << "pre : " << S.rangemin(1, 0, 0) << '\n';
	// cerr << "add child " << i << '\n';
	// children.insert(i);
	S.add(1, i, N, +1);

	// output();

	// cerr << "post : " << S.rangemin(1, 0, 0) << '\n';
}

void removechild(int i)
{
	// cerr << "remove child " << i << '\n';
	// children.erase(children.find(i));
	S.add(1, i, N, -1);

	// output();
}

int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);

	int T;
	cin >> T;

	for(int t = 1; t <= T; t++)
	{
		cin >> N;

		S.build(1, 0, N); //could bad values be accessed from previous tests? check if WA

		// cerr << "pre pre : " << S.rangemin(1, 0, 0) << '\n';

		// output();

		X = H = V = vi(1+N);

		int maxelf = 0;

		for(int i = 1; i <= N; i++)
			cin >> X[i];

		for(int i = 1; i <= N; i++)
		{
			cin >> H[i];
			if(H[i] == 0)
				maxelf = max(maxelf, i);
		}

		for(int i = 1; i <= N; i++)
			cin >> V[i];

		vi D(1+N, -1);

		int jm = 0; //J - 1

		set<pii> gifts; 

		// cerr << "Maxelf = " << maxelf << '\n';

		vi remgift(1+N, -1);

		for(int i = 0; i <= N; i++)
		{
			// cerr << "i = " << i << '\n';
			// cerr << H[i] << '\n';
			if(i >= 1)
			{
				if(H[i] == 0) //elf
				{
					// newgift[i].push_back(i);
					gifts.insert({V[i], i});
					// cerr << "adding elf : " << i << '\n';
					addelf(V[i]);
				}
				else //child
				{
					auto it = gifts.lower_bound({V[i], -1});
					if(it != gifts.end())
					{
						remgift[i] = it->second;
						gifts.erase(it);
						// cerr << "removing elf : " << remgift[i] << '\n';
						removeelf(V[remgift[i]]);
					}
				}
			}
		}


		// for(int i = N-1; i >= 0; i--)
		for(int i2 = N; i2 >= maxelf; i2--)
		{
			// for(int i2 = i+1; i2 <= N; i2++)

			// for(int z = i2+1; z <= N; z++)
			// {
			if(i2 < N)
			{
				if(H[i2+1] == 0)
					removeelf(V[i2+1]);
				else if(remgift[i2+1] >= 1)
					addelf(V[remgift[i2+1]]);
			}
				
			// }

			int ilo;

			for(int i = i2-1; i >= 0; i--)
			{

				if(H[i+1] == 1)
				{
					addchild(V[i+1]);
					if(remgift[i+1] >= 1)
						addelf(V[remgift[i+1]]);
				}


				if(S.mn[1] >= 0)
				{
					// if(D[i2] == -1 || X[i2] + (X[i2] - X[i+1]) < D[i2])
					D[i2] = X[i2] + (X[i2] - X[i+1]);
					ilo = i;
					break;
				}
			}

			for(int u = ilo; u <= i2; u++)
			{
				if(H[u] == 0)
				{
					// removeelf(V[u]);
					// addelf(V[u]);
					;
				}
				else 
				{
					removechild(V[u]);

					if(remgift[u] >= 1)
					removeelf(V[remgift[u]]);
				}
			}
		}



		for(int i = 1; i <= N; i++)
			cout << D[i] << ' ';
		cout << '\n';
	}
}

Compilation message (stderr)

santa.cpp: In function 'int main()':
santa.cpp:166:7: warning: unused variable 'jm' [-Wunused-variable]
  166 |   int jm = 0; //J - 1
      |       ^~
santa.cpp:219:8: warning: 'ilo' may be used uninitialized in this function [-Wmaybe-uninitialized]
  219 |    int ilo;
      |        ^~~

• Subtask 1: 0 / 100