Submission #1063161

#	Time	Username	Problem	Language	Result	Execution time	Memory
1063161		anton	Trains (BOI24_trains)	C++17	0 / 100	17 ms	3416 KiB

Main

#include<bits/stdc++.h>

using namespace std;

#define int long long 
#define pii pair<int, int>
const int MAX_N = 1e5;
const int MOD = 1e9+7;
int N;

int d[MAX_N];
int x[MAX_N];
int dp[MAX_N];
int sufs[MAX_N+1];

signed main(){
    cin>>N;

    for(int i = 0; i<N; i++){
        cin>>d[i]>>x[i];
    }

    sufs[N] = 0;
    for(int i = N-1; i>=0; i--){
        dp[i] =1;
        dp[i] = (dp[i]+sufs[i+1]-sufs[min(N, i+x[i]+1)])%MOD;
        sufs[i]=  (sufs[i+1]+dp[i])%MOD;
    }

    cout<<dp[0]<<endl;
}

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