Submission #1125700

#	Time	Username	Problem	Language	Result	Execution time	Memory
1125700		tte0	Trains (BOI24_trains)	C++20	21 / 100	2094 ms	2680 KiB

Main

// Author: Teoman Ata Korkmaz
#include <bits/stdc++.h> 
#define int int_fast64_t
using namespace std;
constexpr int N=100005;
constexpr int MOD=1e9+7;
///////////////////////////////////////////////////////////
int n,d[N],x[N],v[N],ans;

signed main(void){
    cin>>n;
    for(int i=0;i<n;i++)cin>>d[i]>>x[i];
    
    v[0]=1;
    for(int i=0;i<n;i++){
        ans=(ans+v[i])%MOD;
        if(!d[i])continue;
        for(int j=1;j<=x[i] && i+j*d[i]<n;j++){
            v[i+j*d[i]]+=v[i];
            v[i+j*d[i]]%=MOD;
        }
    }

    cout<<ans<<endl;
}

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