Submission #1111906

#	Time	Username	Problem	Language	Result	Execution time	Memory
1111906		gelastropod	Trains (BOI24_trains)	C++17	0 / 100	24 ms	2248 KiB

Main

#include <bits/stdc++.h>
using namespace std;
#define int long long

signed main()
{
	int N, a, b;
	cin >> N;
	vector<int> pref(N + 1, 0), dp(N, 0);
	vector<pair<int, int>> vals;
	for (int i = 0; i < N; i++)
	{
		cin >> a >> b;
		vals.push_back({ a, b });
	}
	for (int i = N - 1; i >= 0; i--)
	{
		dp[i] = (1 + pref[i + 1] - pref[min(N, i + vals[i].second + 1)]) % 1000000007;
		pref[i] = (dp[i] + pref[i + 1]) % 1000000007;
	}
	cout << dp[0] << '\n';
}

• Subtask 1: 0 / 8
• Subtask 2: 0 / 13
• Subtask 3: 0 / 16
• Subtask 4: 0 / 34
• Subtask 5: 0 / 29