// [auto_folder]: coci
// ^ type folder name for scripted placement
// Codeforces
// #pragma GCC optimize ("Ofast")
// #pragma GCC target ("avx2")
#include <bits/stdc++.h>
using namespace std;
/* #region template */
using ll = long long;
using db = long double; // or double, if TL is tight
using str = string; // yay python!
using pi = pair<int,int>;
using pl = pair<ll,ll>;
using pd = pair<db,db>;
using vi = vector<int>;
using vb = vector<bool>;
using vl = vector<ll>;
using vd = vector<db>;
using vs = vector<str>;
using vpi = vector<pi>;
using vpl = vector<pl>;
using vpd = vector<pd>;
#define tcT template<class T
#define tcTU tcT, class U
#define tcTUU tcT, class ...U
#define tN typename
#define cexp constexpr
tcT> using V = vector<T>;
tcT, size_t SZ> using AR = array<T,SZ>;
tcT> using PR = pair<T,T>;
// pairs
#define mp make_pair
#define f first
#define s second
// vectors
// size(x), rbegin(x), rend(x) need C++17
#define sz(x) int((x).size())
#define bg(x) begin(x)
#define all(x) bg(x), end(x)
#define rall(x) x.rbegin(), x.rend()
#define sor(x) sort(all(x))
#define sorr(x) sort(rall(x))
#define rsz resize
#define ins insert
#define ft front()
#define bk back()
#define pb push_back
#define eb emplace_back
#define pf push_front
#define lb lower_bound
#define ub upper_bound
tcT> int lwb(V<T>& a, const T& b) { return int(lb(all(a),b)-bg(a)); }
// loops
#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)
#define R0F(i,a) ROF(i,0,a)
#define rep(a) F0R(_,a)
#define each(a,x) for (auto& a: x)
const int MOD = 1e9+7; // 998244353;
const ll INF = 1e18; // not too close to LLONG_MAX
const db PI = acos((db)-1);
const char nl = '\n';
const int dx[4] = {1,0,-1,0}, dy[4] = {0,1,0,-1}; // for every grid problem!!
mt19937 rng((uint32_t)chrono::steady_clock::now().time_since_epoch().count());
template<class T> using pqg = priority_queue<T,vector<T>,greater<T>>;
// bitwise ops
// also see https://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html
constexpr int pct(int x) { return __builtin_popcount(x); } // # of bits set
constexpr int bits(int x) { // assert(x >= 0); // make C++11 compatible until USACO updates ...
return x == 0 ? 0 : 31-__builtin_clz(x); } // floor(log2(x))
constexpr int p2(int x) { return 1<<x; }
constexpr int msk2(int x) { return p2(x)-1; }
ll cdiv(ll a, ll b) { return a/b+((a^b)>0&&a%b); } // divide a by b rounded up
ll fdiv(ll a, ll b) { return a/b-((a^b)<0&&a%b); } // divide a by b rounded down
// variadic max
template<tN h0, tN h1, tN...Tl>
cexp auto max(h0 &&hf, h1 &&hs, Tl &&... tl) {
if cexp (sizeof...(tl) == 0)
return hf > hs ? hf : hs;
else return max(max(hf, hs), tl...);
}
// vardiadic min
template<tN h0, tN h1, tN...Tl>
cexp auto min(h0 &&hf, h1 &&hs, Tl &&... tl) {
if cexp (sizeof...(tl) == 0)
return hf < hs ? hf : hs;
else return min(min(hf, hs), tl...);
}
// variadic min / max
tcT> bool ckmin(T& a, const T& b) {
return b < a ? a = b, 1 : 0; } // set a = min(a,b)
tcTUU> bool ckmin(T &a, U... b) {
T mn = min(b...);
return mn < a ? a = mn, 1 : 0; } // set a = max(a,b)
tcT> bool ckmax(T& a, const T& b) {
return a < b ? a = b, 1 : 0; }
tcTUU> bool ckmax(T &a, U... b) {
T mx = max(b...);
return mx > a ? a = mx, 1 : 0; } // set a = min(a,b)
// searching
tcTU> T fstTrue(T lo, T hi, U f) {
hi ++; assert(lo <= hi); // assuming f is increasing
while (lo < hi) { // find first index such that f is true
T mid = lo+(hi-lo)/2;
f(mid) ? hi = mid : lo = mid+1;
}
return lo;
}
tcTU> T lstTrue(T lo, T hi, U f) {
lo --; assert(lo <= hi); // assuming f is decreasing
while (lo < hi) { // find first index such that f is true
T mid = lo+(hi-lo+1)/2;
f(mid) ? lo = mid : hi = mid-1;
}
return lo;
}
tcT> void remDup(vector<T>& v) { // sort and remove duplicates
sort(all(v)); v.erase(unique(all(v)),end(v)); }
tcTU> void erase(T& t, const U& u) { // don't erase
auto it = t.find(u); assert(it != end(t));
t.erase(it); } // element that doesn't exist from (multi)set
inline namespace Helpers {
//////////// is_iterable
// https://stackoverflow.com/questions/13830158/check-if-a-variable-type-is-iterable
// this gets used only when we can call begin() and end() on that type
tcT, class = void> struct is_iterable : false_type {};
tcT> struct is_iterable<T, void_t<decltype(begin(declval<T>())),
decltype(end(declval<T>()))
>
> : true_type {};
tcT> constexpr bool is_iterable_v = is_iterable<T>::value;
//////////// is_readable
tcT, class = void> struct is_readable : false_type {};
tcT> struct is_readable<T,
typename std::enable_if_t<
is_same_v<decltype(cin >> declval<T&>()), istream&>
>
> : true_type {};
tcT> constexpr bool is_readable_v = is_readable<T>::value;
//////////// is_printable
// // https://nafe.es/posts/2020-02-29-is-printable/
tcT, class = void> struct is_printable : false_type {};
tcT> struct is_printable<T,
typename std::enable_if_t<
is_same_v<decltype(cout << declval<T>()), ostream&>
>
> : true_type {};
tcT> constexpr bool is_printable_v = is_printable<T>::value;
}
inline namespace Input {
tcT> constexpr bool needs_input_v = !is_readable_v<T> && is_iterable_v<T>;
tcTUU> void re(T& t, U&... u);
tcTU> void re(pair<T,U>& p); // pairs
// re: read
tcT> typename enable_if<is_readable_v<T>,void>::type re(T& x) { cin >> x; } // default
tcT> void re(complex<T>& c) { T a,b; re(a,b); c = {a,b}; } // complex
tcT> typename enable_if<needs_input_v<T>,void>::type re(T& i); // ex. vectors, arrays
tcTU> void re(pair<T,U>& p) { re(p.f,p.s); }
tcT> typename enable_if<needs_input_v<T>,void>::type re(T& i) {
each(x,i) re(x); }
tcTUU> void re(T& t, U&... u) { re(t); re(u...); } // read multiple
// rv: resize and read vectors
void rv(size_t) {}
tcTUU> void rv(size_t N, V<T>& t, U&... u);
template<class...U> void rv(size_t, size_t N2, U&... u);
tcTUU> void rv(size_t N, V<T>& t, U&... u) {
t.rsz(N); re(t);
rv(N,u...); }
template<class...U> void rv(size_t, size_t N2, U&... u) {
rv(N2,u...); }
// dumb shortcuts to read in ints
void decrement() {} // subtract one from each
tcTUU> void decrement(T& t, U&... u) { --t; decrement(u...); }
#define ints(...) int __VA_ARGS__; re(__VA_ARGS__);
#define int1(...) ints(__VA_ARGS__); decrement(__VA_ARGS__);
}
inline namespace ToString {
tcT> constexpr bool needs_output_v = !is_printable_v<T> && is_iterable_v<T>;
// ts: string representation to print
tcT> typename enable_if<is_printable_v<T>,str>::type ts(T v) {
stringstream ss; ss << fixed << setprecision(15) << v;
return ss.str(); } // default
tcT> str bit_vec(T t) { // bit vector to string
str res = "{"; F0R(i,sz(t)) res += ts(t[i]);
res += "}"; return res; }
str ts(V<bool> v) { return bit_vec(v); }
template<size_t SZ> str ts(bitset<SZ> b) { return bit_vec(b); } // bit vector
tcTU> str ts(pair<T,U> p); // pairs
tcT> typename enable_if<needs_output_v<T>,str>::type ts(T v); // vectors, arrays
tcTU> str ts(pair<T,U> p) { return "("+ts(p.f)+", "+ts(p.s)+")"; }
tcT> typename enable_if<is_iterable_v<T>,str>::type ts_sep(T v, str sep) {
// convert container to string w/ separator sep
bool fst = 1; str res = "";
for (const auto& x: v) {
if (!fst) res += sep;
fst = 0; res += ts(x);
}
return res;
}
tcT> typename enable_if<needs_output_v<T>,str>::type ts(T v) {
return "{"+ts_sep(v,", ")+"}"; }
// for nested DS
template<int, class T> typename enable_if<!needs_output_v<T>,vs>::type
ts_lev(const T& v) { return {ts(v)}; }
template<int lev, class T> typename enable_if<needs_output_v<T>,vs>::type
ts_lev(const T& v) {
if (lev == 0 || !sz(v)) return {ts(v)};
vs res;
for (const auto& t: v) {
if (sz(res)) res.bk += ",";
vs tmp = ts_lev<lev-1>(t);
res.ins(end(res),all(tmp));
}
F0R(i,sz(res)) {
str bef = " "; if (i == 0) bef = "{";
res[i] = bef+res[i];
}
res.bk += "}";
return res;
}
}
inline namespace Output {
tcT> void pr_sep(ostream& os, str, const T& t) { os << ts(t); }
template<class T, class... U> void pr_sep(ostream& os, str sep, const T& t, const U&... u) {
pr_sep(os,sep,t); os << sep; pr_sep(os,sep,u...); }
// print w/ no spaces
template<class ...T> void pr(const T&... t) { pr_sep(cout,"",t...); }
// print w/ spaces, end with newline
void ps() { cout << "\n"; }
template<class ...T> void ps(const T&... t) { pr_sep(cout," ",t...); ps(); }
// debug to cerr
template<class ...T> void dbg_out(const T&... t) {
pr_sep(cerr," | ",t...); cerr << endl; }
void loc_info(int line, str names) {
cerr << "Line(" << line << ") -> [" << names << "]: "; }
template<int lev, class T> void dbgl_out(const T& t) {
cerr << "\n\n" << ts_sep(ts_lev<lev>(t),"\n") << "\n" << endl; }
#ifdef LOCAL
#define dbg(...) loc_info(__LINE__,#__VA_ARGS__), dbg_out(__VA_ARGS__)
#define dbgl(lev,x) loc_info(__LINE__,#x), dbgl_out<lev>(x)
#else // don't actually submit with this
#define dbg(...) 0
#define dbgl(lev,x) 0
#endif
}
inline namespace FileIO {
void setIn(str s) { (void)!freopen(s.c_str(),"r",stdin); }
void setOut(str s) { (void)!freopen(s.c_str(),"w",stdout); }
void setIO(str s = "") {
cin.tie(0)->sync_with_stdio(0); // unsync C / C++ I/O streams
// cin.exceptions(cin.failbit);
// throws exception when do smth illegal
// ex. try to read letter into int
if (sz(s)) setIn(s+".in"), setOut(s+".out"); // for old USACO
}
};
/* #endregion */
// Changeable constants
const db EPS = 1e-9;
const int mx = 401;
/* #region snippets */
/* #endregion */
int n, k;
vi depth, d;
vi adj[mx];
set<int> blk;
void search() {
fill(all(depth), -1);
// dbg(depth);
// {dep, node, par}
queue<pair<int, pi>> bfs;
bfs.push({0, {0, -1}});
while(sz(bfs)) {
auto top = bfs.front(); bfs.pop();
depth[top.s.f] = top.f;
each(x, adj[top.s.f]) if(x != top.s.s && top.f < k && !blk.count(x)) bfs.push({top.f + 1, {x, top.s.f}});
}
}
void solve() {
re(n, k);
if(k * k >= n) {
ps("DA");
return;
}
d.rsz(n); depth.rsz(n);
rep(n - 1) {
int1(a, b);
adj[a].pb(b);
adj[b].pb(a);
}
// {dep, node, par}
queue<pair<int, pi>> bfs;
bfs.push({0, {0, -1}});
while(sz(bfs)) {
auto top = bfs.front(); bfs.pop();
d[top.s.f] = top.f;
each(x, adj[top.s.f]) if(x != top.s.s) bfs.push({top.f + 1, {x, top.s.f}});
}
dbg(d);
F0R(s, 1 << n) {
if(pct(s) == k) {
blk.clear();
vpi cand(k);
int idx = 0;
F0R(i, n) if(s & (1 << i)) {
cand[idx++] = {d[i], i};
}
sor(cand);
bool good = true;
// depth has to be >= 1, 2, 3, 4, ... k
F0R(i, k) {
if(cand[i].f <= i) {
good = false;
break;
}
}
if(!good) continue;
each(c, cand) blk.insert(c.s);
// dbg(cand);
// dbg(blk);
// check if valid cover
// get depths and sort
search();
// dbg(bitset<5>(s));
dbg(depth);
each(x, depth) {
if(x >= k) {
good = false; break;
}
}
if(good) {
ps("DA");
return;
}
}
}
// dbg(depth);
ps("NE");
return;
}
signed main() {
// clock_t start = clock();
setIO();
int n = 1;
// re(n);
rep(n) {
// pr("Case #", _ + 1, ": "); // Kickstart
cerr << "[dbg] Case #" << _ + 1 << ":\n";
solve();
}
// cerr << "Total Time: " << (double)(clock() - start)/ CLOCKS_PER_SEC;
}
/* stuff you should look for
* int overflow, array bounds
* special cases (n=1?)
* do smth instead of nothing and stay organized
* WRITE STUFF DOWN
* DON'T GET STUCK ON ONE APPROACH
*/
Compilation message
burza.cpp: In function 'void solve()':
burza.cpp:276:20: warning: statement has no effect [-Wunused-value]
276 | #define dbg(...) 0
| ^
burza.cpp:345:2: note: in expansion of macro 'dbg'
345 | dbg(d);
| ^~~
burza.cpp:276:20: warning: statement has no effect [-Wunused-value]
276 | #define dbg(...) 0
| ^
burza.cpp:380:4: note: in expansion of macro 'dbg'
380 | dbg(depth);
| ^~~
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Runtime error |
1 ms |
468 KB |
Execution killed with signal 6 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Runtime error |
2 ms |
468 KB |
Execution killed with signal 6 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
340 KB |
Output is correct |
| 2 |
Correct |
0 ms |
340 KB |
Output is correct |
| 3 |
Correct |
1 ms |
212 KB |
Output is correct |
| 4 |
Correct |
1 ms |
212 KB |
Output is correct |
| 5 |
Runtime error |
2 ms |
468 KB |
Execution killed with signal 6 |
| 6 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Runtime error |
2 ms |
488 KB |
Execution killed with signal 6 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
340 KB |
Output is correct |
| 2 |
Runtime error |
2 ms |
468 KB |
Execution killed with signal 6 |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
340 KB |
Output is correct |
| 2 |
Runtime error |
1 ms |
468 KB |
Execution killed with signal 6 |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
340 KB |
Output is correct |
| 2 |
Runtime error |
6 ms |
468 KB |
Execution killed with signal 6 |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
340 KB |
Output is correct |
| 2 |
Correct |
1 ms |
340 KB |
Output is correct |
| 3 |
Correct |
1 ms |
212 KB |
Output is correct |
| 4 |
Correct |
0 ms |
340 KB |
Output is correct |
| 5 |
Runtime error |
2 ms |
468 KB |
Execution killed with signal 6 |
| 6 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Runtime error |
1 ms |
468 KB |
Execution killed with signal 6 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
340 KB |
Output is correct |
| 2 |
Correct |
0 ms |
340 KB |
Output is correct |
| 3 |
Correct |
1 ms |
212 KB |
Output is correct |
| 4 |
Correct |
1 ms |
212 KB |
Output is correct |
| 5 |
Incorrect |
1 ms |
340 KB |
Output isn't correct |
| 6 |
Halted |
0 ms |
0 KB |
- |
