Submission #576496

#	Time	Username	Problem	Language	Result	Execution time	Memory
576496		Jassar	Fountain (eJOI20_fountain)	C++14	0 / 100	1587 ms	3808 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;
    }
    int sum[n],s2[n];
	for (ll i=0; n>i; i++)
    {
        ll a,b;
        cin >> a >> b;
        v.push_back({a , b});
        sum[i] = v[i].second;
    }
    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);
    }
    for (int i=n-1; i>=0; i--)
    {
        if (p[i] != -1)
        {
            sum[i] += sum[p[i]];
        }
    }
    while (q--)
    {
        ll a,b;
        cin >> a >> b;
        a--;
        if (b > sum[a])
        {
            cout << 0 << endl;
        }
        else
        {
            while (b > 0)
            {
                b -= v[a].second;
                if (0 >= b)
                {
                    cout << a + 1 << endl;
                    break;
                }
                a = p[a];
            }
        }
    }
	return 0;
}

Compilation message (stderr)

fountain.cpp: In function 'int main()':
fountain.cpp:18:16: warning: unused variable 's2' [-Wunused-variable]
   18 |     int sum[n],s2[n];
      |                ^~

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