Submission #974367

#	Time	Username	Problem	Language	Result	Execution time	Memory
974367		CSQ31	Curtains (NOI23_curtains)	C++17	100 / 100	823 ms	74876 KiB

curtains

#include<bits/stdc++.h>
using namespace std;
#define pb push_back
#define fi first
#define se second
#define sz(a) (int)(a.size())
#define all(a) a.begin(),a.end()
#define lb lower_bound
#define ub upper_bound
#define owo ios_base::sync_with_stdio(0);cin.tie(0);
#define MOD (ll)(998244353)
#define INF (ll)(1e18)
#define debug(...) fprintf(stderr, __VA_ARGS__),fflush(stderr)
#define time__(d) for(long blockTime = 0; (blockTime == 0 ? (blockTime=clock()) != 0 : false);\
debug("%s time : %.4fs\n", d, (double)(clock() - blockTime) / CLOCKS_PER_SEC))
typedef long long int ll;
typedef long double ld;
typedef pair<ll,ll> PII;
typedef pair<int,int> pii;
typedef vector<vector<int>> vii;
typedef vector<vector<ll>> VII;
const int MAXN = 5e5+5;
int t[4*MAXN],lazy[4*MAXN];
void pushdown(int v){
    lazy[2*v] = max(lazy[2*v],lazy[v]);
    lazy[2*v+1] = max(lazy[2*v+1],lazy[v]);
    t[2*v] = max(t[2*v],lazy[v]);
    t[2*v+1] = max(t[2*v+1],lazy[v]);
    lazy[v] = 0;
}

void upd(int v,int l,int r,int tl,int tr,int val){
    if(l>r)return;
   // cout<<v<<" "<<l<<" "<<r<<" "<<tl<<" "<<tr<<" "<<val<<'\n';
    if(l == tl && r == tr){
        t[v] = max(t[v],val);
        lazy[v] = max(lazy[v],val);
        return;
    }
    int tm = (tl+tr)/2;
    pushdown(v);
    upd(2*v,l,min(tm,r),tl,tm,val);
    upd(2*v+1,max(l,tm+1),r,tm+1,tr,val);
    t[v] = min(t[2*v],t[2*v+1]);
}
int query(int v,int l,int r,int tl,int tr){
    if(l>r)return 1e9;
   // cout<<"q "<<v<<" "<<l<<" "<<r<<" "<<tl<<" "<<tr<<" "<<t[v]<<'\n';
    if(l == tl && r == tr)return t[v];
    int tm = (tl+tr)/2;
    pushdown(v);
    return min(query(2*v,l,min(tm,r),tl,tm),query(2*v+1,max(l,tm+1),r,tm+1,tr));
}
int main()
{
    owo
    int n,m,q;
    cin>>n>>m>>q;
    vii range(n+1);
    vector<vector<pii>>que(n+1);
    
    for(int i=0;i<m;i++){
        int l,r;
        cin>>l>>r;
        range[r].pb(l);
    }
    for(int i=0;i<q;i++){
        int l,r;
        cin>>l>>r;
        que[r].pb({l,i});
    }
    vector<int>ans(q+1,1);
    for(int r=1;r<=n;r++){
        for(int l : range[r]){
            upd(1,l,r,1,n,l);
            //cout<<l<<" "<<r<<'\n';
        }
        //for(int i=1;i<=n;i++)cout<<query(1,i,i,1,n)<<" ";
        //cout<<'\n';
        for(pii x : que[r]){
            int res = query(1,x.fi,r,1,n);
            if(res < x.fi)ans[x.se] = 0;
        }
    }
    for(int i=0;i<q;i++){
        if(ans[i])cout<<"YES"<<'\n';
        else cout<<"NO"<<'\n';
    }
}

• Subtask 1: 3 / 3
• Subtask 2: 6 / 6
• Subtask 3: 15 / 15
• Subtask 4: 20 / 20
• Subtask 5: 36 / 36
• Subtask 6: 20 / 20