Unirytmi

#include <bits/stdc++.h>

using namespace std;

using ll = long long;

ll n, a, b, c;
vector<ll> v;
bool lol[101];

// time, awake
int dp[101][101];

int calc(int t, int aw) {
    if (t >= 100) return 0;
    if (dp[t][aw] != -1) return dp[t][aw];

    if (aw == b) {
        return dp[t][aw] = calc(t + c + 1, 1);
    }
    int mx = calc(t + 1, aw + 1) + lol[t];
    if (aw >= a)
        mx = max(mx, calc(t + c + 1, 1));

    return dp[t][aw] = mx;
} 

int main() {
    cin >> n >> a >> b >> c;

    v.resize(n);

    for (int i = 0; i < n; ++i) {
        cin >> v[i];
        lol[v[i]] = 1;
    }

    for (int i = 0; i <= 100; ++i) {
        for (int j = 0; j <= 100; ++j) dp[i][j] = -1;
    }

    cout << calc(1, 1) << endl;

    return 0;
}

Test 1

Group: 1, 2, 3, 4

Verdict: ACCEPTED

Test 2

Group: 1, 2, 3, 4

Verdict: ACCEPTED

Test 3

Group: 2, 4

Verdict: RUNTIME ERROR

Test 4

Group: 1, 2, 3, 4

Verdict: ACCEPTED

Test 5

Group: 3, 4

Verdict: RUNTIME ERROR

Test 6

Group: 2, 3, 4

Verdict: WRONG ANSWER

Test 7

Group: 4

Verdict: RUNTIME ERROR

Test 8

Group: 4

Verdict: RUNTIME ERROR

Test 9

Group: 1, 2, 3, 4

Verdict: ACCEPTED

Test 10

Group: 2, 4

Verdict: RUNTIME ERROR

Test 11

Group: 3, 4

Verdict: RUNTIME ERROR

Test 12

Group: 1, 2, 3, 4

Verdict: ACCEPTED

Test 13

Group: 1, 2, 3, 4

Verdict: ACCEPTED

Test 14

Group: 2, 4

Verdict: RUNTIME ERROR

Test 15

Group: 2, 3, 4

Verdict: WRONG ANSWER

Test 16

Group: 4

Verdict: RUNTIME ERROR

Test 17

Group: 2, 4

Verdict: RUNTIME ERROR

Test 18

Group: 2, 4

Verdict: RUNTIME ERROR