Submission #1028009

#	Time	Username	Problem	Language	Result	Execution time	Memory
1028009		Abito	Trains (BOI24_trains)	C++17	0 / 100	8 ms	2904 KiB

Main

#include <bits/stdc++.h>
#define F first
#define S second
#define pb push_back
#define ppb pop_back
#define ep insert
#define endl '\n'
#define elif else if
#define pow pwr
#define sqrt sqrtt
#define int long long
#define ll long long
#define y1 YONE
typedef unsigned long long ull;
using namespace std;
const int N=1e5+5,M=1e9+7;
int dp[N],d[N],x[N],n,s[N];
int32_t main(){
    ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
    cin>>n;
    for (int i=1;i<=n;i++) cin>>d[i]>>x[i];
    for (int i=n;i;i--){
        if (!x[i] || !d[i]){
            dp[i]=1;
            s[i]=s[i+1]+1;
            s[i]%=M;
            continue;
        }
        dp[i]=1+s[i+1]-s[min(n+1,i+x[i]+1)];
        dp[i]%=M;
        s[i]=s[i+1]+dp[i];
        s[i]%=M;
    }
    cout<<dp[1]<<endl;
    return 0;
}

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