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Submission #244745

# Submission time Handle Problem Language Result Execution time Memory
244745 2020-07-04T21:52:09 Z eohomegrownapps Global Warming (CEOI18_glo) C++14
0 / 100
 120 ms 5936 KB 
#include <bits/stdc++.h>
using namespace std;

struct Fenwick{
	vector<int> arr;
	int n;
	bool startFromLeft;
	Fenwick(int _n, bool _startFromLeft){
		//0 to n-1 inclusive
		startFromLeft = _startFromLeft;
		n=_n;
		arr.resize(n+1);
	}

	int conv(int ind){
		ind+=1;
		if (!startFromLeft){
			ind=n+1-ind;
		}
		return ind;
	}

	void update(int ind, int val){
		ind = conv(ind);
		while (ind<=n){
			arr[ind]=max(arr[ind],val);
			ind+=ind&(-ind);
		}
	}

	int query(int ind){
		ind = conv(ind);
		int val = 0;
		while (ind>0){
			val=max(val,arr[ind]);
			ind-=ind&(-ind);
		}
		return val;
	}
};

vector<int> vals;
vector<int> mp;

vector<int> lisl;
vector<int> lisr;

int main(){
	cin.tie(0);
	ios_base::sync_with_stdio(0);
	int n,d;
	cin>>n>>d;
	vals.resize(n);
	mp.resize(n);
	for (int i = 0; i<n; i++){
		cin>>vals[i];
		mp[i]=vals[i];
	}
	sort(mp.begin(),mp.end());
	mp.erase(unique(mp.begin(),mp.end()),mp.end());
	for (int i = 0; i<n; i++){
		vals[i]=lower_bound(mp.begin(),mp.end(),vals[i])-mp.begin();
	}
	
	Fenwick *fenl = new Fenwick(n+1, true);
	lisl.resize(n,0);
	for (int i = 0; i<n; i++){
		//cout<<vals[i]<<'\n';
		int mxprev = fenl->query(vals[i]);
		lisl[i]=mxprev+1;
		fenl->update(vals[i]+1,lisl[i]);
	}

	Fenwick *fenr = new Fenwick(n+1, false);
	lisr.resize(n,0);
	int mx = 0;
	for (int i = n-1; i>=0; i--){
		//cout<<vals[i]<<'\n';
		int mxprev = fenr->query(vals[i]+1);
		lisr[i]=mxprev+1;
		fenr->update(vals[i],lisr[i]);
		mx=max(mx,lisr[i]);
	}

	Fenwick *leftdat = new Fenwick(n+1, true);
	
	for (int i = 0; i<n; i++){
		//use item i in rhs of lis
		//how far above can we go?
		int mxup = upper_bound(mp.begin(),mp.end(),mp[i]+d)-mp.begin()-1;
		int mxval = leftdat->query(mxup);
		//cout<<mxup<<' '<<mxval<<' '<<lisr[i]<<'\n';
		mx=max(mx,mxval+lisr[i]);
		leftdat->update(vals[i]+1,lisl[i]);
		//cout<<mx<<'\n';
	}
	cout<<mx<<'\n';
}

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Incorrect 5 ms 384 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Incorrect 5 ms 384 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #3
0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Incorrect 5 ms 384 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 120 ms 5880 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 30 ms 1664 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 55 ms 3112 KB Output is correct
2 Correct 57 ms 3192 KB Output is correct
3 Correct 114 ms 5936 KB Output is correct
4 Correct 75 ms 5880 KB Output is correct
5 Correct 39 ms 3064 KB Output is correct
6 Incorrect 68 ms 5496 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #7
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Incorrect 5 ms 384 KB Output isn't correct
4 Halted 0 ms 0 KB -