1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
#include <cstdio>

struct seg {
    int m_off_l;
    int m_off_r;
    int m_rem_l;
    int m_rem_r;
};

int main(void)
{
    int i, n, k, t, r, l, m_req, s = -1;
    char day[8001] = { 0 };
    seg segs[8001] = { 0 };

    scanf("%d%d%d%s", &n, &k, &t, day);

    for (i = 1; i <= n; i++) {
        segs[i].m_off_l = segs[i-1].m_off_l;
        segs[i].m_rem_l = segs[i-1].m_rem_l;

        if (day[i-1] == '1')
            segs[i].m_off_l++;

        if (day[i-1] == '2')
            segs[i].m_rem_l++;
    }

    for (i = 0; i < n; i++) {
        segs[i].m_off_r = segs[n].m_off_l - segs[i].m_off_l;
        segs[i].m_rem_r = segs[n].m_rem_l - segs[i].m_rem_l;
    }

    m_req = segs[0].m_off_r + segs[0].m_rem_r - k;

    if (m_req < 0)
        m_req = 0;

    if (segs[0].m_off_r <= k) {
        printf("%d\n", n - m_req);
        return 0;
    }

    for (r = 2*t; r <= n; r++) {
        for (l = 0; l <= r - 2*t; l++) {
            int m_rem = segs[r].m_rem_r + segs[l].m_rem_l;
            int m_off = segs[r-t].m_off_l + segs[r-t].m_rem_l -
                segs[l+t].m_off_l - segs[l+t].m_rem_l;
            int m_av = m_rem + m_off;

            if (m_av < m_req)
                continue;

            int m_remreq = m_req - m_off;

            if (m_remreq < 0)
                m_remreq = 0;

            int n_av = n - r + l - m_remreq;

            if (n_av > s)
                s = n_av;
        }
    }

    printf("%d\n", s);
    return 0;
}