oj.uz

Submission #1085207

# Submission time Handle Problem Language Result Execution time Memory
1085207 2024-09-07T17:00:02 Z elotelo966 Election (BOI18_election) C++17
100 / 100
 481 ms 48352 KB 
#include <bits/stdc++.h>
using namespace std;
 
#define int long long
#define OYY LLONG_MAX
#define mod 998244353
#define faster ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
#define FOR for(int i=1;i<=n;i++)
#define mid (start+end)/2
#define lim 500005
#define fi first
#define se second

array<int,4> bos;

int arr[lim];

int sum[4*lim],ans[4*lim],le[4*lim],ri[4*lim];

inline void build(int node,int start,int end){
	if(start==end){
		sum[node]=le[node]=ri[node]=ans[node]=arr[start];
		le[node]=ri[node]=max(le[node],0ll);
		ans[node]=max(ans[node],0ll);
		return ;
	}
	build(node*2,start,mid),build(node*2+1,mid+1,end);
	sum[node]=sum[node*2]+sum[node*2+1];
	le[node]=max({le[node*2],sum[node*2]+le[node*2+1],0ll});
	ri[node]=max({ri[node*2+1],sum[node*2+1]+ri[node*2],0ll});
	ans[node]=max({ans[node*2]+sum[node*2+1],ans[node*2+1]+sum[node*2],le[node*2]+ri[node*2+1],0ll});
}

inline array<int,4> query(int node,int start,int end,int l,int r){
	if(start>end || start>r || end<l)return bos;
	if(start>=l && end<=r){
		array<int,4> tut;
		tut[0]=sum[node];
		tut[1]=le[node];
		tut[2]=ri[node];
		tut[3]=ans[node];
		return tut;
	}
	array<int,4> tut;
	array<int,4> left=query(node*2,start,mid,l,r);
	array<int,4> right=query(node*2+1,mid+1,end,l,r);
	tut[0]=left[0]+right[0];
	tut[1]=max({left[1],left[0]+right[1],0ll});
	tut[2]=max({right[2],right[0]+left[2],0ll});
	tut[3]=max({left[3]+right[0],right[3]+left[0],left[1]+right[2],0ll});
	return tut;
}

inline void debug(int node,int start,int end){
	cout<<node<<" "<<start<<" "<<end<<" "<<sum[node]<<" "<<le[node]<<" "<<ri[node]<<" "<<ans[node]<<endl;
	if(start==end)return ;
	debug(node*2,start,mid),debug(node*2+1,mid+1,end);
}

int32_t main(){
	faster
	int n;cin>>n;
	string s;cin>>s;
	FOR{
		if(s[i-1]=='C')arr[i]=-1;
		else arr[i]=1;
	}
	
	build(1,1,n);
	
	//debug(1,1,n);
	
	int q;cin>>q;
	while(q--){
		int x,y;cin>>x>>y;
		array<int,4> tut=query(1,1,n,x,y);
		cout<<tut[3]<<'\n';
	}
	
	return 0;
}

Subtask #1
28.0 / 28.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 600 KB Output is correct
2 Correct 1 ms 600 KB Output is correct
3 Correct 1 ms 600 KB Output is correct
4 Correct 1 ms 604 KB Output is correct
5 Correct 1 ms 604 KB Output is correct

Subtask #2
54.0 / 54.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 600 KB Output is correct
2 Correct 1 ms 600 KB Output is correct
3 Correct 1 ms 600 KB Output is correct
4 Correct 1 ms 604 KB Output is correct
5 Correct 1 ms 604 KB Output is correct
6 Correct 52 ms 10596 KB Output is correct
7 Correct 46 ms 10332 KB Output is correct
8 Correct 48 ms 10324 KB Output is correct
9 Correct 44 ms 10356 KB Output is correct
10 Correct 48 ms 10320 KB Output is correct
11 Correct 55 ms 10576 KB Output is correct
12 Correct 53 ms 10580 KB Output is correct
13 Correct 55 ms 10636 KB Output is correct
14 Correct 47 ms 10580 KB Output is correct
15 Correct 46 ms 10580 KB Output is correct

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 600 KB Output is correct
2 Correct 1 ms 600 KB Output is correct
3 Correct 1 ms 600 KB Output is correct
4 Correct 1 ms 604 KB Output is correct
5 Correct 1 ms 604 KB Output is correct
6 Correct 52 ms 10596 KB Output is correct
7 Correct 46 ms 10332 KB Output is correct
8 Correct 48 ms 10324 KB Output is correct
9 Correct 44 ms 10356 KB Output is correct
10 Correct 48 ms 10320 KB Output is correct
11 Correct 55 ms 10576 KB Output is correct
12 Correct 53 ms 10580 KB Output is correct
13 Correct 55 ms 10636 KB Output is correct
14 Correct 47 ms 10580 KB Output is correct
15 Correct 46 ms 10580 KB Output is correct
16 Correct 470 ms 47336 KB Output is correct
17 Correct 391 ms 46964 KB Output is correct
18 Correct 441 ms 47136 KB Output is correct
19 Correct 355 ms 46560 KB Output is correct
20 Correct 473 ms 46564 KB Output is correct
21 Correct 467 ms 48352 KB Output is correct
22 Correct 474 ms 48140 KB Output is correct
23 Correct 467 ms 48284 KB Output is correct
24 Correct 481 ms 48104 KB Output is correct
25 Correct 478 ms 47648 KB Output is correct