Submission #1367312

#	Time	Username	Problem	Language	Result	Execution time	Memory
1367312		taly	Trains (BOI24_trains)	C++20	21 / 100	2094 ms	2776 KiB

Main

#include <bits/stdc++.h>
#define all(x) (x).begin(),(x).end()
#define pb push_back
#define int long long
using namespace std;
int mod=1e9+7;

signed main(){
    ios::sync_with_stdio(false);
    cin.tie(NULL);
    int n; cin >> n;
    vector<int> d(n+1), x(n+1);
    for(int i=1; i<=n; i++){
        cin >> d[i] >> x[i];
    }
    int resp=0;
    vector<int> r(n+1);
    for(int i=n; i>=1; i--){
        if(d[i]!=0){
            for(int j=i; j<=n&&j<=x[i]*d[i]+i; j+=d[i]){
                r[i]=(r[i]+r[j])%mod;
                // cout << i << ": "<<j<<endl;
            }
        }
        r[i]++;
        r[i]%=mod;
        // cout << i << " "<<r[i]<<endl;
        // resp=(resp+r[i])%mod;
    }
    cout << r[1]<<endl;

}

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