Submission #1267947

#	Time	Username	Problem	Language	Result	Execution time	Memory
1267947		gry3125	Trains (BOI24_trains)	C++20	0 / 100	2095 ms	28244 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;

int n; 
set<ll> adj[100005];
vector<ll> ans(100005);

int main() {
    cin >> n;
    for (int i = 1; i <= n; i++) {
        ll d, x; cin >> d >> x;
        for (ll j = 1; d > 0 && j <= x && i+j*d <= n; j++) {
        	adj[i+j*d].insert(i+(j-1)*d);
        }
    }
    ll cur = 0; ans[1] = 1;
    for (int i = 1; i <= n; i++) {
        for (auto j : adj[i]) {
            ans[i] += ans[j]; ans[i] %= (ll)1e9+7;
        }
        cur += ans[i]; cur %= (ll)1e9+7;
    }
    cout << cur;
    return 0;
}

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