Submission #1027873

#	Time	Username	Problem	Language	Result	Execution time	Memory
1027873		Unforgettablepl	Mizuyokan 2 (JOI23_mizuyokan2)	C++17	0 / 100	668 ms	2644 KiB

mizuyokan2

#include <bits/stdc++.h>
using namespace std;

#define int long long

void answer(vector<int> arr){
	int n = arr.size();
	arr.insert(arr.begin(),0);
	vector<int> S(n+1);
	for(int i=1;i<=n;i++)S[i]=S[i-1]+arr[i];
	vector<pair<int,int>> buffer(n+1);
	for(int i=0;i<=n;i++)buffer[i]={arr[i]+S[i],i};
	sort(buffer.begin(),buffer.end());
	auto iter = buffer.begin();
	set<int> possible;
	vector<int> DP(n+1);
	for(int i=1;i<=n;i++){
		while(iter!=buffer.end() and iter->first<S[i-1]){
			possible.insert((iter++)->second);
		}
		int r = i;
		for(int jump=131072;jump;jump/=2){
			if(r-jump<0)continue;
			if(S[r-jump]>=S[i-1]-arr[i])r-=jump;
		}
		auto iter2 = possible.lower_bound(r);
		DP[i]=1;
		auto b = *iter2;
		for(int j:possible){
			if(j==b or j==i-1)break;
			DP[i]=max(DP[i],DP[j]+2);
		}
	}
	int ans = DP[n];
	int sum = arr[n];
	for(int i=n-1;i;i--){
		if(arr[i]<sum)ans=max(ans,DP[i]+1);
		sum+=arr[i];
	}
	cout << ans << '\n';
}

int32_t main(){
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
	int n;
	cin >> n;
	vector<int> L(n+1);
	for(int i=1;i<=n;i++)cin>>L[i];
	int q;
	cin >> q;
	for(int i=1;i<=q;i++){
		int x,y,a,b;cin>>x>>y>>a>>b;
		L[x]=y;
		vector<int> arr;
		for(int j=a+1;j<=b;j++){
			arr.emplace_back(L[j]);
		}
		answer(arr);
	}
}

• Subtask 1: 0 / 6
• Subtask 2: 0 / 9
• Subtask 3: 0 / 13
• Subtask 4: 0 / 32
• Subtask 5: 0 / 29
• Subtask 6: 0 / 11