Submission #653450

#TimeUsernameProblemLanguageResultExecution timeMemory
653450inksamuraiThe short shank; Redemption (BOI21_prison)C++17
80 / 100
2103 ms90568 KiB

#include <bits/stdc++.h>
#pragma GCC optimize ("O3")
#pragma GCC target ("sse4")
#pragma GCC target ("avx,avx2")
// cut here
#ifdef _MSC_VER
#include <intrin.h>
#endif
 
namespace atcoder {
 
namespace internal {
 
int ceil_pow2(int n) {
    int x = 0;
    while ((1U << x) < (unsigned int)(n)) x++;
    return x;
}
 
int bsf(unsigned int n) {
#ifdef _MSC_VER
    unsigned long index;
    _BitScanForward(&index, n);
    return index;
#else
    return __builtin_ctz(n);
#endif
}
 
}  // namespace internal
 
}  // namespace atcoder
 
 
namespace atcoder {
 
template <class S, S (*op)(S, S), S (*e)()> struct segtree {
  public:
    segtree() : segtree(0) {}
    segtree(int n) : segtree(std::vector<S>(n, e())) {}
    segtree(const std::vector<S>& v) : _n(int(v.size())) {
        log = internal::ceil_pow2(_n);
        size = 1 << log;
        d = std::vector<S>(2 * size, e());
        for (int i = 0; i < _n; i++) d[size + i] = v[i];
        for (int i = size - 1; i >= 1; i--) {
            update(i);
        }
    }
 
    void set(int p, S x) {
        //assert(0 <= p && p < _n);
        p += size;
        d[p] = x;
        for (int i = 1; i <= log; i++) update(p >> i);
    }
 
    S get(int p) {
        //assert(0 <= p && p < _n);
        return d[p + size];
    }
 
    S prod(int l, int r) {
        //assert(0 <= l && l <= r && r <= _n);
        S sml = e(), smr = e();
        l += size;
        r += size;
 
        while (l < r) {
            if (l & 1) sml = op(sml, d[l++]);
            if (r & 1) smr = op(d[--r], smr);
            l >>= 1;
            r >>= 1;
        }
        return op(sml, smr);
    }
 
    S all_prod() { return d[1]; }
 
    template <bool (*f)(S)> int max_right(int l) {
        return max_right(l, [](S x) { return f(x); });
    }
    template <class F> int max_right(int l, F f) {
        //assert(0 <= l && l <= _n);
        //assert(f(e()));
        if (l == _n) return _n;
        l += size;
        S sm = e();
        do {
            while (l % 2 == 0) l >>= 1;
            if (!f(op(sm, d[l]))) {
                while (l < size) {
                    l = (2 * l);
                    if (f(op(sm, d[l]))) {
                        sm = op(sm, d[l]);
                        l++;
                    }
                }
                return l - size;
            }
            sm = op(sm, d[l]);
            l++;
        } while ((l & -l) != l);
        return _n;
    }
 
    template <bool (*f)(S)> int min_left(int r) {
        return min_left(r, [](S x) { return f(x); });
    }
    template <class F> int min_left(int r, F f) {
        //assert(0 <= r && r <= _n);
        //assert(f(e()));
        if (r == 0) return 0;
        r += size;
        S sm = e();
        do {
            r--;
            while (r > 1 && (r % 2)) r >>= 1;
            if (!f(op(d[r], sm))) {
                while (r < size) {
                    r = (2 * r + 1);
                    if (f(op(d[r], sm))) {
                        sm = op(d[r], sm);
                        r--;
                    }
                }
                return r + 1 - size;
            }
            sm = op(d[r], sm);
        } while ((r & -r) != r);
        return 0;
    }
 
  private:
    int _n, size, log;
    std::vector<S> d;
 
    void update(int k) { d[k] = op(d[2 * k], d[2 * k + 1]); }
};
 
}  // namespace atcoder
// cut here 

using namespace std;
#define rep(i,n) for(int i=0;i<n;i++)
#define per(i,n) for(int i=n-1;i>=0;i--)
#define rng(i,c,n) for(int i=c;i<n;i++)
#define fi first
#define se second
#define pb push_back
#define sz(a) (int)a.size()
#define vec(...) vector<__VA_ARGS__>
#define _3D2ZDxo ios::sync_with_stdio(0),cin.tie(0)
typedef long long ll;
using pii=pair<int,int>;
using vi=vector<int>;
void print(){cout<<'\n';}
template<class h,class...t>
void print(const h&v,const t&...u){cout<<v<<' ',print(u...);}

void chmax(pii&a,pii b){
	if(a.fi<b.fi){
		a=b;
	}else if(a.fi==b.fi){
		a.se=min(a.se,b.se);
	}
}

const int _n=8000011;

pii _seg[_n];
int lazy[_n];
bool flag[_n];

// struct lazy_segtree{
int n,en;
// lazy_segtree(int m){
// 	init(m);
// }
void init(int m){
	n=m;
	en=1;
	while(en<=m){
		en*=2;
	}
	en*=2;
}
void build(int node,int l,int r){
	if(l==r-1){
		_seg[node].fi=0;
		_seg[node].se=l;
		return;
	}
	int m=(l+r)>>1;
	build(node*2,l,m);
	build(node*2+1,m,r);
	_seg[node].se=l;
}
void push(int l,int r,int node){
	if(flag[node]){
		_seg[node].fi+=lazy[node];
		if(node*2<en){
			lazy[node*2]+=lazy[node];
			flag[node*2]=true;
		}
		if(node*2+1<en){
			lazy[node*2+1]+=lazy[node];
			flag[node*2+1]=true;
		}
		flag[node]=false;
		lazy[node]=0;
	}
}
void _set(int node,int l,int r,int x,int _l,int _r){
	push(l,r,node);
	if(l>=_r or r<=_l){
		return;
	}
	if(l>=_l and r<=_r){
		lazy[node]+=x;
		flag[node]=true;
		push(l,r,node);
		return;
	}
	int m=(l+r)>>1;
	_set(node*2,l,m,x,_l,_r);
	_set(node*2+1,m,r,x,_l,_r);
	// prod seg_node
	_seg[node]={0,0};
	chmax(_seg[node],_seg[node*2]);
	chmax(_seg[node],_seg[node*2+1]);
}
void build(){
	build(1,0,n);
}
void _set(int l,int r,int x){
	// [l,r)
	_set(1,0,n,x,l,r);
}


const int inf=1e9;

int op(int l,int r){return min(l,r);}
int e(){return inf;}

int tar;
bool f(int p){
	return p>tar;
}

signed main(){
_3D2ZDxo;
	int n,k,t;
	cin>>n>>k>>t;
	k=min(k,n);
	vi a(n);
	rep(i,n){
		cin>>a[i];
	}

	vi dl(n,-1);
	set<pii> st;
	rep(i,n){
		if(sz(st)){
			auto it=st.lower_bound({i,-1});
			if(it!=st.end()){
				dl[i]=(*it).se;
			}
		}
		int val=t-a[i]+i;
		while(sz(st)){
			auto it=st.begin();
			pii p=*it;
			if(p.fi>val) break;
			st.erase(it);
		}
		st.insert({val,i});
	}

	atcoder::segtree<int,op,e> ids(n);
	init(n);
	build();
	st.clear();
	int ans=n;
	rep(i,n){
		if(a[i]<=t) continue;
		if(dl[i]==-1){
			ans-=1;
		}else{
			_set(dl[i],i+1,1);
			ids.set(i,dl[i]);
		}
	}

	while(k){
		push(0,n,1);
		pii p=_seg[1];
		if(p.fi==0) break;
		ans-=p.fi;
		int frm=p.se;
		while(p.fi>0){
			tar=frm;
			int c=ids.max_right<f>(frm);
			int j=c;
			_set(dl[j],j+1,-1);
			ids.set(j,inf);
			p.fi-=1;
		}
		k-=1;
	}
	print(ans);
}
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