Submission #1047138

#	Time	Username	Problem	Language	Result	Execution time	Memory
1047138		KarolZ	Trains (BOI24_trains)	C++14	16 / 100	34 ms	26196 KiB

Main

#include<iostream>
#include<vector>
#include<unordered_map>
using namespace std;
typedef long long ll;
const ll mod=1000000007;
unordered_map<ll,ll>m[100010];//pozycja,o ile skok, ile dodac
unordered_map<ll,ll>::iterator it;
int main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
	ll n,v1,v2,wyn=0,akt;
	cin>>n;
	for(ll i=1;i<=n;i++){
		akt=0;
		if(i==1)akt++;
		for(it=m[i].begin();it!=m[i].end();it++){
			akt+=it->second;
			if(i+it->first<=n)m[i+it->first][it->first]+=it->second%mod;
		}
		cin>>v1>>v2;
		m[i+v1][v1]+=akt%mod;
		if(i+v1*(v2+1)<=n&&i+v2<=n)m[i+v1*(v2+1)][v1]-=akt%mod-mod;
		wyn+=akt;
		wyn%=mod;
	}
	cout<<wyn;
	return 0;
}

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