Submission #1047271

#	Time	Username	Problem	Language	Result	Execution time	Memory
1047271		KarolZ	Trains (BOI24_trains)	C++14	100 / 100	186 ms	268272 KiB

Main

#include<iostream>
#include<vector>
using namespace std;
typedef long long ll;
const ll mod=1000000007,skrt=330;
ll m[100010][skrt+10];
ll mm[100010];
int main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
	ll n,v1,v2,wyn=0,akt;
	cin>>n;
	for(int i=1;i<=n;i++){
		akt=mm[i];
		if(i==1)akt++;
		for(int j=1;j<=skrt;j++){
			akt+=m[i][j];
			if(i+j<=n)m[i+j][j]+=m[i][j];
		}
		cin>>v1>>v2;
		if(v1<=skrt){
			if(i+v1<=n)m[i+v1][v1]+=akt%mod;
			if(i+v1*(v2+1)<=n&&i+v2<=n)m[i+v1*(v2+1)][v1]-=akt%mod-mod;
		}
		else{
			for(int j=i+v1;j<=min(n,i+v1*v2);j+=v1)mm[j]+=akt%mod;
		}
		wyn+=akt;
		wyn%=mod;
	}
	cout<<wyn;
	return 0;
}

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