Submission #931437

#	Time	Username	Problem	Language	Result	Execution time	Memory
931437		kirakosyan	Fountain (eJOI20_fountain)	C++17	60 / 100	207 ms	3276 KiB

fountain

#include<algorithm>
#include<iostream>
#include<vector>
#include<string>
#include<random>
#include<cmath>
#include<stack>
#include<map>
#include <iomanip> 
#include <queue>
#include <set>
using namespace std;
using ll = long long;
using ull = unsigned long long;
vector<ll>v,vis;
vector<vector<ll>>gp;
void solve(){
    ll n,q; cin >> n >> q;
    vector<ll>d(n),c(n),pref(n);
    for(ll i=0;i<n;i++)cin >> d[i] >> c[i];
    pref[0]=c[0];
    for(ll i=1;i<n;i++){
        pref[i]=pref[i-1]+c[i];
    }
    if(n<=1000&&q<=2000){
       for(int i=0;i<q;i++){
           int a,b,f=0,cnt=0,ans=0; cin >> a >> b;
           a--;
           for(int i=a;i<n;i++){
               if(i!=a&&d[i]<=cnt)continue;
               if(b>c[i]){
                   b-=c[i];
                   cnt=d[i];
               }
               else{
                   cout<<i+1<<endl;
                   f=1;
                   break;
               }
           }
           if(f==0)cout<<f<<endl;
       } 
    }
    else{
    for(ll i=0;i<q;i++){
        ll a,b; cin >> a >> b;
        --a;
        if(a!=0){
            a--;
            ll k=lower_bound(pref.begin(),pref.end(),pref[a]+b)-pref.begin();
            if(k==n)cout<<0<<endl;
            else cout<<k+1<<endl;
        }
        else{
            ll k=lower_bound(pref.begin(),pref.end(),b)-pref.begin();
            if(k==n)cout<<0<<endl;
            else cout<<k+1<<endl;
        }
    }
    }
}
signed main() {
    ios_base::sync_with_stdio(false);
	cin.tie(NULL); cin.tie(nullptr);
	 // ll _; cin >> _;
  //     while (_--){
        solve();
   // }
}

Compilation message (stderr)

fountain.cpp: In function 'void solve()':
fountain.cpp:27:30: warning: unused variable 'ans' [-Wunused-variable]
   27 |            int a,b,f=0,cnt=0,ans=0; cin >> a >> b;
      |                              ^~~

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