Submission #576476

#	Time	Username	Problem	Language	Result	Execution time	Memory
576476		Jassar	Fountain (eJOI20_fountain)	C++14	0 / 100	1587 ms	3708 KiB

fountain

#include <bits/stdc++.h>
#define ll long long

using namespace std;


int main()
{
	ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
	ll n,q;
	cin >> n >> q;
	vector<pair<ll , ll>> v;
	stack<ll> s;
	ll p[n];
	for (ll i=0; n>i; i++)
    {
        p[i] = 0;
    }
	for (ll i=0; n>i; i++)
    {
        ll a,b;
        cin >> a >> b;
        v.push_back({a , b});
    }
    for (ll i=n-1; i>=0; i--)
    {
        while (!s.empty() && v[i].first > v[s.top()].first)
        {
            s.pop();
        }
        if (s.empty())
        {
            p[i] = -1;
        }
        else
        {
            p[i] = s.top();
        }
        s.push(i);
    }
    while (q--)
    {
        ll a,b;
        cin >> a >> b;
        a--;
        ll i=a;
        while(b > 0)
        {
            b -= v[i].second;
            if (b <= 0)
            {
                cout << i + 1 << endl;
                i = -1;
                break;
            }
            i = p[i];
            if (i == -1)
            {
                cout << 0 << endl;
                break;
            }
        }
    }
	return 0;
}

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