Submission #1365129

#	Time	Username	Problem	Language	Result	Execution time	Memory
1365129		ezzzay	Trains (BOI24_trains)	C++20	34 / 100	130 ms	2780 KiB

Main

#include<bits/stdc++.h>
using namespace std;
#define ff first
#define ss second
#define pb push_back
#define int long long
const int N=1e5+5;
const int mod=1e9+7;
int dp[N];
int d[N],x[N];
int sv[500][500];
signed main(){
    int n;
    cin>>n;
    for(int i=1;i<=n;i++)cin>>d[i]>>x[i];
    // x udaa d eer userne 
    int B=sqrt(N);
    dp[1]=1;
    
    for(int i=1;i<=n;i++){
        for(int j=1;j<B;j++){
            (dp[i]+=sv[j][i%j])%=mod;
        }
        if(x[i]==0 or d[i]==0)continue;
        if( d[i]>=B){
            for(int j=1;j<=x[i];j++){
                if(i+ d[i]*j<=n){
                    (dp[i+d[i]*j]+=dp[i])%=mod;
                }
                else break;
            }
        }
        else{
            (sv[d[i]][i%d[i]]+=dp[i]);
        }
        
    }
    int ans=0;
    for(int i=1;i<=n;i++)(ans+=dp[i])%=mod;
    cout<<ans;
}

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