Submission #1369493

#	Time	Username	Problem	Language	Result	Execution time	Memory
1369493		Charizard2021	Trains (BOI24_trains)	C++20	21 / 100	2095 ms	1448 KiB

Main

#include<bits/stdc++.h>
using namespace std;
const int MOD = 1e9 + 7;
int main(){
    int n;
    cin >> n;
    vector<int> d(1 + n);
    vector<int> x(1 + n);
    for(int i = 1; i <= n; i++){
        cin >> d[i] >> x[i];
    }
    vector<int> dp(1 + n, 0);
    for(int i = n; i >= 1; i--){
        if(d[i] == 0){
            dp[i] = 1;
            continue;
        }
        int cur = i;
        int cnt = 0;
        while(cur + d[i] <= n && cnt + 1 <= x[i]){
            cur += d[i];
            cnt++;
            dp[i] = (dp[i] + dp[cur]) % MOD;
        }
        dp[i]++;
    }
    cout << dp[1] << "\n";
}

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