Submission #298805

#	Time	Username	Problem	Language	Result	Execution time	Memory
298805		YJU	Two Antennas (JOI19_antennas)	C++14	100 / 100	1237 ms	97912 KiB

antennas

#include<bits/stdc++.h>
#pragma GCC optimize("unroll-loops,no-stack-protector")
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<ll,ll> pll;
const ll MOD=1e9+7;
const ll MOD2=998244353;
const ll N=4e5+5;
const ll K=350;
const ld pi=3.14159265359;
const ll INF=(1LL<<40);
#define SQ(i) ((i)*(i))
#define REP(i,n) for(ll i=0;i<n;i++)
#define REP1(i,n) for(ll i=1;i<=n;i++)
#define pb push_back
#define mp make_pair
#define X first
#define Y second
#define setp setprecision
#define lwb lower_bound
#define SZ(_a) (ll)_a.size()

ll seg[4*N],ma[4*N],val[4*N];
ll n,q,L[N],R[N],h[N],a[N],b[N],ans[N];
vector<ll> add[N],rem[N],Q[N];

void push(ll id,ll l,ll r){
	val[id]=max(val[id],ma[id]+seg[id]);
	if(l!=r-1){
		ma[id*2]=max(ma[id*2],ma[id]);
		ma[id*2+1]=max(ma[id*2+1],ma[id]);
	}
	ma[id]=-INF;
}

void ins(ll id,ll l,ll r,ll to,ll vl){
	push(id,l,r);
	if(l==r-1){
		seg[id]=vl;val[id]=max(val[id],ma[id]+seg[id]);
		return ;
	}
	ll mid=(l+r)/2;
	if(to<mid){
		ins(id*2,l,mid,to,vl);
	}else{
		ins(id*2+1,mid,r,to,vl);
	}
    val[id]=max({val[id],val[id*2],val[id*2+1]});
    seg[id]=max(seg[id*2],seg[id*2+1]);
}

void upd(ll id,ll l,ll r,ll ql,ll qr,ll vl){
	push(id,l,r);
	if(l>=ql&&r<=qr){ma[id]=vl;push(id,l,r);return ;}
	if(l>=qr||r<=ql)return ;
	ll mid=(l+r)/2;
    upd(id*2,l,mid,ql,qr,vl);
    upd(id*2+1,mid,r,ql,qr,vl);
	val[id]=max(val[id],max(val[id*2],val[id*2+1]));
}

ll query(ll id,ll l,ll r,ll ql,ll qr){
	push(id,l,r);
    if(l>=ql&&r<=qr)return val[id];
    if(l>=qr||r<=ql)return -INF;
    ll mid=(l+r)/2;
    return max(query(id*2,l,mid,ql,qr),query(id*2+1,mid,r,ql,qr));
}

void solve(){
    //reset
    REP(i,4*N)ma[i]=seg[i]=val[i]=-INF;
    //end
	REP1(i,n){
        for(auto j:add[i])ins(1,1,n+1,j,-h[j]);
        for(auto j:rem[i])ins(1,1,n+1,j,-INF);
        ll tmpl=max(1LL,i-b[i]),tmpr=max(1LL,i-a[i]+1);
        upd(1,1,n+1,tmpl,tmpr,h[i]);
        for(auto j:Q[i])ans[j]=max(ans[j],query(1,1,n+1,L[j],R[j]+1));
	}
}

int main(){
	ios_base::sync_with_stdio(0);cin.tie(0);
	cin>>n;
	REP1(i,n){
		cin>>h[i]>>a[i]>>b[i];
        add[i+a[i]].pb(i);
        rem[i+b[i]+1].pb(i);
	}
	cin>>q;
	REP1(i,q){
		cin>>L[i]>>R[i];
        Q[R[i]].pb(i);
        ans[i]=-INF;
	}
	solve();
	REP1(i,n)h[i]=-h[i];
	solve();
	REP1(i,q){
		cout<<(ans[i]<0?-1:ans[i])<<"\n";
	}
	return 0;
}

• Subtask 1: 2 / 2
• Subtask 2: 11 / 11
• Subtask 3: 22 / 22
• Subtask 4: 65 / 65