Submission #1066419

#	Time	Username	Problem	Language	Result	Execution time	Memory
1066419		Essa2006	Trains (BOI24_trains)	C++14	0 / 100	2047 ms	2384 KiB

Main

#include<bits/stdc++.h>
using namespace std;
#define ll long long 
#define endl '\n'
#define FF first
#define SS second
#define all(a) a.begin(), a.end()
#define mod (ll)(1000000007)

int main() {
    ios_base::sync_with_stdio(0);cin.tie(0);
    
    int n;
    cin >> n;
    
    vector<int> D(n), X(n);
    vector<ll> dp(n);
    ll sum = 0;
    for (int i = 0; i < n; i++) {
        cin >> D[i] >> X[i];
        
        if (i == 0) {
            dp[i] = 1;
            sum += dp[i];
            continue;
        }
        
        for (int j = 0; j < i; j++) {
            if (i <= j + D[j] * X[j] && D[j] && ((i - j) % D[j] == 0)) {
                dp[i] += dp[j];
                dp[i] %= mod;
            }
        }
        
        //cout << i + 1 << " : " << dp[i] << endl;
        
        sum += dp[i];
        sum %= mod;
    }
    cout << sum;
}   

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