Submission #1128248

#	Time	Username	Problem	Language	Result	Execution time	Memory
1128248		Choco	Fountain (eJOI20_fountain)	C++20	60 / 100	1595 ms	3392 KiB

fountain

#include<bits/stdc++.h>
using namespace std;
#define Study ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define ll long long
#define ull unsigned long long
#define pb push_back
#define ff first 
#define ss second
#define ins insert
#define all(x) x.begin(),x.end()
#define fori(x,y,z) for(ll x=y;x<=z;x++)
const ll INF=1e9;
const ll sz=2e5+10;
const ll mod=1e9+7;
void work(){
    ll n,q;
    cin>>n>>q;
    vector<pair<ll,ll>>v(n+1);
    vector<ll>pref(n+10,0);
    v[0].ss=-1;v[0].ff=-1;
    bool yes=0;
    fori(i,1,n){
        ll d,x;
        cin>>d>>x;
        v[i].ff=d;
        v[i].ss=x;
        pref[i]=pref[i-1]+x;
        if(v[i].ff<=v[i-1].ff){
            yes=1;
        }
    }
    if(yes){
    while(q--){
        ll d,l;
        cin>>d>>l;
        ll sum=v[d].ss;
        ll maxr=v[d].ff;
        d++;
        while(d<=n and sum<l){
            if(v[d].ff>maxr){
            sum+=v[d].ss;
            maxr=v[d].ff;
            }
            d++;
        }
        if(sum>=l)
        d--;
        //cout<<d<<' '<<sum<<endl;
        if(sum<l and d>=n)
        cout<<0<<endl;
        else
        cout<<d<<endl;
    }
    }
    else{
        while(q--){
            ll d,x;
            cin>>d>>x;
            ll l=d;
            ll r=n;
            ll ans=0;
            while(l<=r){
                ll mid=(l+r)/2;
                if(pref[mid]-pref[d-1]>=x){
                r=mid-1;
                ans=mid;
                }
                else
                l=mid+1;
            }
            if(pref[ans]-pref[d-1]<x){
                cout<<0<<endl;
            }
            else{
                cout<<ans<<endl;
            }
        }
    }
}
int main(){
    Study;
    ll t=1;
    //cin>>t;
    while(t--){
        work();
    }
}

• Subtask 1: 30 / 30
• Subtask 2: 30 / 30
• Subtask 3: 0 / 40