Submission #1084761

#	Time	Username	Problem	Language	Result	Execution time	Memory
1084761		zxcigan	Trains (BOI24_trains)	C++17	16 / 100	13 ms	4192 KiB

Main

#include <bits/stdc++.h>

using namespace std;
using ll = long long;
#define int long long
const int N = 2e5;
const int mod = 1e9 + 7;
const int B = 335;
int dp[N];
int32_t main() {
#ifdef LOCAL
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif // LOCAL
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n;
    cin >> n;
    dp[1] = 1;
    int s = 0;
    vector<vector<int>> add (B + 1, vector<int> (B + 1, 0));
    set<array<int,2>> st;
    vector<int> pref (n + 3);
    int C = 0;
    for (int i = 1; i <= n; ++i) {
        int x, d;
        cin >> d >> x;
        if (i != 1) dp[i] = C;
        if (x && d) {
            (C += dp[i]) %= mod;
            (pref[min (n + 1, i + x * d)] += dp[i]) %= mod;
        }
        C -= pref[i];
        if (C < 0) C += mod;
        (s += dp[i]) %= mod;
    }
//    cout << dp[3] << '\n';
    cout << s << '\n';
}

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