Submission #1111430

#	Time	Username	Problem	Language	Result	Execution time	Memory
1111430		Ruichen	Trains (BOI24_trains)	C++17	0 / 100	2080 ms	592 KiB

Main

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

int main(){
	int n, ans=0, d, x;
	long long p;
	cin >> n;
	vector<int> a(n,0);
	a[0]=1;
	for(int i=0; i<n; i++){
		cin >> d >> x;
		p=i;
		if(d>0){
			for(int j=0; j<x; j++){
				p+=d;
				if(p<n){
					a[p]+=a[i];
					//cout << a[i] << " " << a[p] << endl;
					a[p]%=(int)1e9+7;
				}
			}
		} 
		ans+=a[i];
		ans%=(int)1e9+7;
	}
	cout << ans << endl;
	return 0;
}

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