This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
# include <bits/stdc++.h>
# define mkp make_pair
# define ff first
# define ss second
# define pll pair <ll, ll>
# define pii pair <int, int>
# define vec vector
# define pb push_back
# define pf push_front
# define ppb pop_back
# define ppf pop_front
# define all(x) (x).begin(), (x).end()
# define rall(x) (x).rbegin(), (x).rend()
# define sz(x) ((int)(x).size())
# define lb lower_bound
# define ub upper_bound
# define br break
# define rt return
# define cn continue
# define nl "\n"
# define off exit(0)
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
const ll MAXN = 1e5 + 25;
const ll MAXL = 18 + 0;
const ll INF1 = 1e18 + 0;
const ll INF2 = 2e9 + 0;
const ll MOD = 1e9 + 7;
const ll M0D = 998244353;
const ld PI = acos((ld) -1);
const ll P = 67 + 0 + 0;
int dx[4] = {-1, 0, 1, 0};
int dy[4] = {0, -1, 0, 1};
using namespace std;
void qataima ()
{
ios::sync_with_stdio(false);
cin.tie(0);
}
int n, k, pref[MAXN];
string s;
bool dp[405][405][405];
bool used[405][405][405];
bool search (int l, int r, int cnt, bool boo)
{
if (l + r > n) rt 0;
if (used[l][r][cnt]) rt dp[l][r][cnt];
used[l][r][cnt] = 1;
int sum = pref[l] + (pref[n] - pref[n - r]);
if (sum - cnt == k) rt dp[l][r][cnt] = 1;
if (sum == k) rt dp[l][r][cnt] = 0;
if (boo)
{
boo = 1 - boo;
dp[l][r][cnt] = (search(l + 1, r, cnt + (s[l] == 'C'), boo) | search(l, r + 1, cnt + (s[n - 1 - r] == 'C'), boo));
}
else
{
boo = 1 - boo;
dp[l][r][cnt] = (search(l + 1, r, cnt, boo) | search(l, r + 1, cnt, boo));
}
rt dp[l][r][cnt];
}
void ma1n ()
{
cin >> n >> k;
cin >> s;
for (int i = 1; i <= n; ++i)
{
pref[i] = pref[i - 1] + (s[i - 1] == 'C');
}
int l = 0, r = 0, cnt = 0;
bool boo = 1;
cout << (search(l, r, cnt, boo) ? "DA" : "NE") << nl;
}
int main (/* <3 */)
{
qataima ();
int zxc = 1;
// cin >> zxc;
while (zxc--)
{
ma1n();
}
return 0;
}
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