Submission #1144738

#	Time	Username	Problem	Language	Result	Execution time	Memory
1144738		harry_tm_18	Trains (BOI24_trains)	C++20	0 / 100	2130 ms	1051564 KiB

Main

#include <bits/stdc++.h>
using namespace std;

int main() {

    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int n;
    cin >> n;

    vector<pair<int,int>> a(n+1);

    for(int i=1; i<=n; ++i){
        cin >> a[i].first >> a[i].second;
    }

    unordered_map<int,vector<int>> mp;

    for(int i=1; i<=n; ++i){
        for(int j=1; j<=a[i].second; ++j){
            mp[i].push_back(i + (j * a[i].first));
        }
    }

    vector<int> dp(n+1);
    dp[1] = 1;

    for(int i=1; i<=n; ++i){
        for(int j=1; j<i; ++j){
            for(int l : mp[j]){
                if (i == l) dp[i]++;
            }
        }
        dp[i] += dp[i-1];
    }

    cout << dp[n] << endl;

    return 0;
}

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