Submission #995462

#	Time	Username	Problem	Language	Result	Execution time	Memory
995462		12345678	Trains (BOI24_trains)	C++17	21 / 100	2070 ms	1080 KiB

Main

#include <bits/stdc++.h>

using namespace std;

const int nx=1e5+5, mod=1e9+7;

int n, d[nx], x[nx], dp[nx], res;

int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>n;
    for (int i=1; i<=n; i++) cin>>d[i]>>x[i];
    dp[1]=1;
    for (int i=2; i<=n; i++)
    {
        for (int j=1; j<i; j++)
        {
            if (d[j]==0) continue;
            if (((i-j)%d[j])==0&&(((i-j)/d[j])<=x[j])) dp[i]=(dp[i]+dp[j])%mod;
        }
    }
    for (int i=1; i<=n; i++) res=(res+dp[i])%mod;
    cout<<res;
}

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