Submission #1055711

#	Time	Username	Problem	Language	Result	Execution time	Memory
1055711		ezzzay	Trains (BOI24_trains)	C++14	21 / 100	980 ms	1048720 KiB

Main

#include<bits/stdc++.h>
using namespace std;
#define ff first
#define int long long
#define ss second
#define pb push_back
const int N=3e5+5;
const int mod=1e9+7;
int cnt[N];
std::vector<int>v[N],vc[N];
int dp[N];
signed main(){
    int n;
    cin>>n;
    for(int i=1;i<=n;i++){
        int d,x;
        cin>>d>>x;
        if(d==0)continue;
        for(int j=1;j<=x;j++){
            if(i+d*j>n)break;
            v[i].pb(i+d*j);
            vc[i+d*j].pb(i);
        }
    }
    dp[1]=1;
    for(int i=2;i<=n;i++){
        for(auto b:vc[i]){
           
            dp[i]+=dp[b];
            dp[i]%=mod;
        }
    }
    int ans=0;
    for(int i=1;i<=n;i++){
        ans+=dp[i];
        ans%=mod;
    }
   cout<<ans;
    
}

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