Submission #433358

#	Time	Username	Problem	Language	Result	Execution time	Memory
433358		couplefire	The short shank; Redemption (BOI21_prison)	C++17	80 / 100	2101 ms	288376 KiB

prison

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

const int N=2e6+5,mod=1e9+7;

int t,tree[4*N],n,a[N],lazy[4*N],ans,D,removed[N],mn[N][24];

pair<int,int> tr[4*N];
pair<int,int> w[4*N];

void build(int u,int l,int r){
	if(l==r)  {
		tree[u] = a[l] - l; tr[u].second = l;
		return;
	}
	int mid=(l+r)/2;
	build(2*u,l,mid);
	build(2*u+1,mid+1,r);
	tree[u] = min(tree[2*u],tree[2*u+1]);
	tr[u].second = l;
}

void update(int u,int start,int end,int l,int r,int val) {
	if(lazy[u]) {
		tr[u].first += lazy[u];
		if(l!=r){
			lazy[2*u] += lazy[u];
			lazy[2*u+1] += lazy[u];
		}
		lazy[u] = 0;
	}
	if(l>end || r<start) return;
	if(start<=l && r<=end) {
		lazy[u] = val;
		tr[u].first += lazy[u];
		if(l!=r){
			lazy[2*u] += lazy[u];
			lazy[2*u+1] += lazy[u];
		}
		lazy[u] = 0;		
		return;
	} 
	int mid = (l+r)/2;
	update(2*u,start,end,l,mid,val);
	update(2*u+1,start,end,mid+1,r,val);
	tr[u] = max(tr[2*u],tr[2*u+1]);
}

void insert(int u,int ind,int l,int r,int st,int en) {
	if(l>ind || r<ind) return; 
	if(l==r) {
		w[u] = {st,en};
		return;
	}
	int mid = (l+r)/2;
	insert(2*u,ind,l,mid,st,en);
	insert(2*u+1,ind,mid+1,r,st,en);
	w[u] = min(w[2*u],w[2*u+1]);
}

pair<int, int> get(int u,int start,int end,int l,int r) {
	if(l>end || r<start) return {n+5,0};
	if(start <= l && r <= end) {
		return w[u];
	}
	int mid=(l+r)/2;
	return min(get(2*u,start,end,l,mid),get(2*u+1,start,end,mid+1,r));
}

signed main(){
	ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0);
	cin>>n>>D>>t;
	
	for(int i=1;i<=n;i++) {
		cin >> a[i];
		mn[i][0] = a[i] - i;
	} 	
	int Lg = log2(n) + 1;
	for(int i=1;i<=Lg;i++) {
		for(int j=1;j<=n;j++) {
			if(j+(1<<(i-1)) <= n)mn[j][i] = min(mn[j][i-1],mn[j+(1<<(i-1))][i-1]);
			else mn[j][i] = mn[j][i-1];
		}
	}
	build(1,1,n);
	for(int i=1;i<=n;i++){
		int l = 1, r =i,ind = 0;
		while(l<=r){
			int mid=(l+r)/2;
			int lg = log2(i-mid+1);
			if(min(mn[i-(1<<lg)+1][lg],mn[mid][lg]) <= t-i) {
				ind = mid;
				l = mid + 1;
			}
			else r = mid - 1; 
		}	

		if(ind) ans++;
		if(ind && ind!=i)  { 
			update(1,ind+1,i,1,n,1);
			insert(1,i,1,n,ind+1,i);
		}
		else  {
			insert(1,i,1,n,n+1,i);
		}
	}  	int b = 0;
	int cnt  = 0;
	while(tr[1].first && D) {
 
		int c = tr[1].second; D--; ans -= tr[1].first; 
	
		while(get(1,c,n,1,n).first <=  c) { cnt++;
			if(cnt > n) return 0;
			
			pair<int,int> g = get(1,c,n,1,n);
	
			insert(1,g.second,1,n,n+1,g.second); removed[g.second] = 1;
			b ++ ;
			update(1,g.first,g.second,1,n,-1); 
		}
	}  
	cout<<ans;
}

• Subtask 1: 15 / 15
• Subtask 2: 10 / 10
• Subtask 3: 20 / 20
• Subtask 4: 10 / 10
• Subtask 5: 25 / 25
• Subtask 6: 0 / 20