# 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);
#ifndef ONLINE_JUDGE
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
#endif
}
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 - 1] - pref[n - 1 - r]);
if ((sum - cnt) == k) rt dp[l][r][cnt] = 1;
if (cnt == k) rt dp[l][r][cnt] = 0;
if (boo)
{
boo = 1 - boo;
dp[l][r][cnt] = ( (search(l + 1, r, cnt + (s[l] == 'C' ? 1 : 0), boo)) | (search(l, r - 1, cnt + (s[r] == 'C' ? 1 : 0), 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 = 0; i < n; ++i)
{
if (i == 0)
{
pref[i] = (s[i] == 'C');
cn;
}
pref[i] = pref[i - 1] + (s[i] == 'C');
}
int l = 0, r = n - 1, 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;
}
Compilation message
Main.cpp: In function 'void qataima()':
Main.cpp:53:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
53 | freopen("input.txt", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:55:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
55 | freopen("output.txt", "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
2 ms |
340 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
2 ms |
340 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
2 ms |
340 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
