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Submission #1094046

# Submission time Handle Problem Language Result Execution time Memory
1094046 2024-09-28T11:03:44 Z alexander707070 Global Warming (CEOI18_glo) C++14
45 / 100
 2000 ms 180340 KB 
#include<bits/stdc++.h>
#define MAXN 200007
using namespace std;

const int inf=1e9;

struct ST{
	struct node{
		int l,r,val;
	};

	node tree[30*MAXN];
	int num;
	
	void init(){
		num=1;
		tree[num]={0,0,0};
	}

	void addnode(){
		num++;
		tree[num]={0,0,0};
	}

	void check(int v){
		if(tree[v].l==0){
			addnode(); tree[v].l=num;
		}

		if(tree[v].r==0){
			addnode(); tree[v].r=num;
		}
	}

	void update(int v,long long l,long long r,int pos,int val){
		if(l==r){
			tree[v].val=max(tree[v].val,val);
		}else{
			long long tt=(l+r)/2;
			check(v);

			if(pos<=tt)update(tree[v].l,l,tt,pos,val);
			else update(tree[v].r,tt+1,r,pos,val);

			tree[v].val=max(tree[tree[v].l].val,tree[tree[v].r].val);
		}
	}

	int getmax(int v,long long l,long long r,long long ll,long long rr){
		if(ll>rr or v==0)return 0;
		if(l==ll and r==rr){
			return tree[v].val;
		}else{
			long long tt=(l+r)/2;
			return max( getmax(tree[v].l,l,tt,ll,min(tt,rr)) , getmax(tree[v].r,tt+1,r,max(tt+1,ll),rr) );
		}
	}
}seg[3];

int n,a[MAXN],ans,x;
int dp[MAXN][3];

int solve(int d){
	seg[0].init();
	seg[1].init();
	seg[2].init();

	int res=0;

	for(int i=1;i<=n;i++){
		dp[i][0]=seg[0].getmax(1,0,2*inf,0,a[i]-1)+1;
		dp[i][1]=max(seg[1].getmax(1,0,2*inf,0,a[i]-1)+1 , seg[0].getmax(1,0,2*inf,0,a[i]+d-1)+1);
		dp[i][2]=max(seg[2].getmax(1,0,2*inf,0,a[i]-1)+1 , seg[1].getmax(1,0,2*inf,0,a[i]-d-1)+1);

		seg[0].update(1,0,2*inf,a[i],dp[i][0]);
		seg[1].update(1,0,2*inf,a[i],dp[i][1]);
		seg[2].update(1,0,2*inf,a[i],dp[i][2]);

		res=max(res,max(dp[i][0],max(dp[i][1],dp[i][2])));
	}

	return res;
}

int main(){

	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);

	cin>>n>>x;
	for(int i=1;i<=n;i++){
		cin>>a[i];
	}

	long long l=-x,r=x,lt,rt;
	while(l+20<r){
		lt=l+(r-l+1)/3;
		rt=r-(r-l+1)/3;

		int ls=solve(lt);
		int rs=solve(rt);

		if(ls>rs)l=lt;
		else if(rs>ls)r=rt;
		else{
			break;
		}
	}

	for(int d=l;d<=r;d++){
		ans=max(ans,solve(d));
	}

	cout<<ans<<"\n";

    return 0;
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 360 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 400 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 468 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 1 ms 468 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 360 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 400 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 468 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 1 ms 468 KB Output is correct
12 Correct 2 ms 348 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 6 ms 504 KB Output is correct
15 Correct 3 ms 504 KB Output is correct
16 Correct 3 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct

Subtask #3
0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 360 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 400 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 468 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 1 ms 468 KB Output is correct
12 Correct 2 ms 348 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 6 ms 504 KB Output is correct
15 Correct 3 ms 504 KB Output is correct
16 Correct 3 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Execution timed out 2072 ms 1884 KB Time limit exceeded
20 Halted 0 ms 0 KB -

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 472 ms 180260 KB Output is correct
2 Correct 487 ms 180236 KB Output is correct
3 Correct 516 ms 180308 KB Output is correct
4 Correct 481 ms 180340 KB Output is correct
5 Correct 258 ms 99152 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 892 ms 52240 KB Output is correct
2 Correct 912 ms 52304 KB Output is correct
3 Correct 920 ms 52400 KB Output is correct
4 Correct 582 ms 28496 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 628 ms 4948 KB Output is correct
7 Correct 759 ms 36792 KB Output is correct

Subtask #6
0 / 17.0

# Verdict Execution time Memory Grader output
1 Execution timed out 2066 ms 97484 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #7
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 360 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 400 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 468 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 1 ms 468 KB Output is correct
12 Correct 2 ms 348 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 6 ms 504 KB Output is correct
15 Correct 3 ms 504 KB Output is correct
16 Correct 3 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Execution timed out 2072 ms 1884 KB Time limit exceeded
20 Halted 0 ms 0 KB -