Submission #321532

#	Time	Username	Problem	Language	Result	Execution time	Memory
321532		ryansee	Hedgehog Daniyar and Algorithms (IZhO19_sortbooks)	C++14	17 / 100	17 ms	2668 KiB

sortbooks

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

#define FAST ios_base::sync_with_stdio(false); cin.tie(0);
#define pb push_back
#define eb emplace_back
#define ins insert
#define f first
#define s second
#define cbr cerr<<"hi\n"
#define mmst(x, v) memset((x), v, sizeof ((x)))
#define siz(x) ll(x.size())
#define all(x) (x).begin(), (x).end()
#define lbd(x,y) (lower_bound(all(x),y)-x.begin())
#define ubd(x,y) (upper_bound(all(x),y)-x.begin())
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());    //can be used by calling rng() or shuffle(A, A+n, rng)
inline long long rand(long long x, long long y) { return rng() % (y+1-x) + x; } //inclusivesss
string inline to_string(char c) {string s(1,c);return s;} template<typename T> inline T gcd(T a,T b){ return a==0?llabs(b):gcd(b%a,a); }

using ll=long long; 
using ld=long double;
#define FOR(i,s,e) for(ll i=s;i<=ll(e);++i)
#define DEC(i,s,e) for(ll i=s;i>=ll(e);--i)
using pi=pair<ll,ll>; using spi=pair<ll,pi>; using dpi=pair<pi,pi>; 

#define LLINF ((long long)1e18)
#define INF int(1e9+1e6)
#define MAXN (10006)
struct node {
	int s,e,m;
	ll v,add,base,mx_base;
	node*l,*r;
	node(int S,int E){
		s=S,e=E,m=(s+e)>>1;
		v=-LLINF, add=-LLINF, base=0, mx_base=0;
		if(s^e)l=new node(s,m),r=new node(m+1,e);
	}
	void update(int x,int y,ll nval) {
		value();
		if(s==x&&e==y) {
			add = max(add, nval);
			return;
		}
		if(x>m) r->update(x,y,nval);
		else if(y<=m) l->update(x,y,nval);
		else l->update(x,m,nval),r->update(m+1,y,nval);
		v = max(l->value()+l->base, r->value()+r->base);
		mx_base = max(l->mx_base, r->mx_base);
	}
	ll rmq(int x,int y) {
		if(x>y) return -LLINF;
		value();
		if(s==x&&e==y) return v + base;
		if(x>m) return r->rmq(x,y);
		else if(y<=m) return l->rmq(x,y);
		else return max(l->rmq(x,m), r->rmq(m+1,y));
	}
	void set(int x,ll nval) {
		value();
		if(s==e) {
			v = nval;
			return;
		}
		if(x>m) r->set(x,nval);
		else l->set(x,nval);
		v = max(l->value()+l->base, r->value()+r->base);
		mx_base = max(l->mx_base, r->mx_base);
	}
	ll value() {
		v = max(v, add + mx_base * (s != e));
		if(s^e) {
			l->add=max(l->add, add);
			r->add=max(r->add, add);
		}
		add=-LLINF;
		return v;
	}
	void set_base(int x, ll nval) {
		value();
		if(s==e) {
			mx_base = base = nval;
			return;
		}
		if(x>m) r->set_base(x, nval);
		else l->set_base(x, nval);
		v = max(l->value()+l->base, r->value()+r->base);
		mx_base = max(l->mx_base, r->mx_base);
	}
	// ll v[MAXN], base[MAXN];
	// node(int S,int E) {
		// FOR(i,S,E) v[i]=-LLINF, base[i]=0;
	// }
	// void update(int x,int y,ll nval) {
		// FOR(i,x,y) v[i]=max(v[i], nval);
	// }
	// ll rmq(int x,int y) {
		// ll ans = -LLINF;
		// FOR(i,x,y) ans=max(ans,v[i]+base[i]);
		// return ans;
	// }
	// void set(int x,ll nval) {
		// v[x]=nval;
	// }
	// void set_base(int x,ll nval) {
		// base[x]=nval;
	// }
} *seg, *ans;
ll n,m,A[MAXN];
bool can[MAXN];
vector<ll> v;
vector<tuple<ll,ll,ll>> Q[MAXN];
int main() {
	FAST
	cin>>n>>m;
	FOR(i,1,n)cin>>A[i];
	seg=new node(1, n), ans = new node(1, n);
	FOR(i,1,m) {
		ll l,r,k;
		cin>>l>>r>>k;
		Q[r].pb({l, k, i});
	}
	auto add=[&](ll x){
		while(v.size() && A[v.back()] <= A[x]) {
			ans->set(v.back(), seg->rmq(siz(v),siz(v)));
			seg->set(siz(v), -LLINF);
			v.pop_back();
		}
		v.eb(x);
		seg->set_base(siz(v), A[x]);
	};
	auto upd=[&](ll x){
		ll st=-1, en=siz(v);
		while(en-st>1){// highest ind that is still > x
			ll mid=(st+en)>>1;
			if(A[v[mid]] > x) st=mid;
			else en=mid;
		}
		if(st<0) return;
		seg->update(1, st+1, x);
	};
	FOR(r,1,n) {
		upd(A[r]);
		add(r);
		for(auto q:Q[r]) {
			ll l=get<0>(q);
			ll ind = lbd(v, l) + 1;
			ll mx = max(ans->rmq(l, r), seg->rmq(ind, siz(v)));
			if(mx <= get<1>(q)) can[get<2>(q)]=1;
		}
	}
	FOR(i,1,m) cout<<can[i]<<'\n';
}

• Subtask 1: 8 / 8
• Subtask 2: 9 / 9
• Subtask 3: 0 / 13
• Subtask 4: 0 / 17
• Subtask 5: 0 / 30
• Subtask 6: 0 / 23