Submission #1267977

#	Time	Username	Problem	Language	Result	Execution time	Memory
1267977		gry3125	Trains (BOI24_trains)	C++20	0 / 100	23 ms	1864 KiB

Main

#include <bits/stdc++.h>
#define pb push_back
#define ll long long int
#define all(v) (v).begin(),(v).end()
#define fi first 
#define se second
using namespace std;

vector<ll> ans(100005);

int main() {
	int n; cin >> n;
	queue<pair<int,ll>> st;
	ll cur = 0, sum = 0;
    for (int i = 1; i <= n; i++) {
        ll d, x; cin >> d >> x;
        ans[i] = sum; ans[1] = 1; sum %= 1000000007;
        if (x > 0) {st.push({i+x, ans[i]}); sum += ans[i];}
        while (st.front().fi <= i) {sum -= st.front().se; st.pop();}
        cur += ans[i]; cur %= 1000000007;
    }
    cout << cur;
    return 0;
}

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