Submission #405451

#	Time	Username	Problem	Language	Result	Execution time	Memory
405451		Falcon	Burza (COCI16_burza)	C++17	160 / 160	805 ms	1908 KiB

burza

#include <bits/stdc++.h>

#ifdef DEBUG
#include "debug.hpp"
#endif

using namespace std;

#define all(c)              (c).begin(), (c).end()
#define rall(c)             (c).rbegin(), (c).rend()
#define traverse(c, it)     for(auto it = (c).begin(); it != (c).end(); ++it)
#define rep(i, N)           for(int i = 0; i < (N); ++i)
#define rrep(i, N)          for(int i = (N) - 1; i >= 0; --i)
#define rep1(i, N)          for(int i = 1; i <= (N); ++i)
#define rep2(i, s, e)       for(int i = (s); i <= (e); ++i)

#ifdef DEBUG
#define debug(x...)         { \
                            ++dbg::depth; \
                            string dbg_vals = dbg::to_string(x); \
                            --dbg::depth; \
                            dbg::fprint(__func__, __LINE__, #x, dbg_vals); \
                            }

#define light_debug(x)      { \
                            dbg::light = true; \
                            dbg::dout << __func__ << ":" << __LINE__; \
                            dbg::dout << "  " << #x << " = " << x << endl; \
                            dbg::light = false; \
                            }

#else
#define debug(x...)         42
#define light_debug(x)      42
#endif


using ll = long long;

template<typename T>
inline T& ckmin(T& a, T b) { return a = a > b ? b : a; }

template<typename T>
inline T& ckmax(T& a, T b) { return a = a < b ? b : a; }

template<class Fun>
class y_combinator_result {
    Fun fun_;
public:
    template<class T>
    explicit y_combinator_result(T &&fun): fun_(std::forward<T>(fun)) {}

    template<class ...Args>
    decltype(auto) operator()(Args &&...args) {
        return fun_(std::ref(*this), std::forward<Args>(args)...);
    }
};

template<class Fun>
decltype(auto) y_combinator(Fun &&fun) {
    return y_combinator_result<std::decay_t<Fun>>(std::forward<Fun>(fun));
}


int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);

    int n, k; cin >> n >> k;

    if(k * k >= n)
        return cout << "DA\n", 0;

    vector<vector<int>> adj(n);
    rep(i, n - 1) {
        int u, v; cin >> u >> v; --u, --v;
        adj[u].push_back(v), adj[v].push_back(u);
    }


    vector<int> in(n), out(n), at_dist_k, p(n), ord;
    y_combinator([&](auto dfs, int u, int d, int pr) -> void {
                static int t{};
                p[u] = pr;

                in[u] = t++;
                ord.push_back(u);
                for(int v: adj[u]) if(v != pr)
                    dfs(v, d + 1, u);
                out[u] = t;

                if(d == k)
                    at_dist_k.push_back(u);

            })(0, 0, -1); 

    vector<int> last(n);
    int m{int(at_dist_k.size())};
    {
        int i = 0;
        rep(j, n) {
            while(i < m && in[at_dist_k[i]] < j) ++i;
            last[ord[j]] = i;
        }

    }

    debug(in, out, ord);
    debug(p);
    debug(at_dist_k);
    debug(last);

    vector<vector<bool>> dp(m + 1, vector<bool>(1 << k));
    fill(all(dp[0]), true);

    rep1(i, m) {
        rep(levels, 1 << k) {
            for(int u = at_dist_k[i - 1], x = 1 << (k - 1); x > 0; x >>= 1, u = p[u]) {
                if(levels & x)
                    dp[i][levels] = dp[i][levels] || dp[last[u]][levels ^ x];
            }
        }
    }

    cout << (dp.back().back() ? "DA" : "NE") << '\n';




    
    #ifdef DEBUG
    dbg::dout << "\nExecution time: "
              << clock() * 1000 / CLOCKS_PER_SEC 
              << "ms" << endl;
    #endif
    return 0;
}

Compilation message (stderr)

burza.cpp: In function 'int main()':
burza.cpp:33:29: warning: statement has no effect [-Wunused-value]
   33 | #define debug(x...)         42
      |                             ^~
burza.cpp:108:5: note: in expansion of macro 'debug'
  108 |     debug(in, out, ord);
      |     ^~~~~
burza.cpp:33:29: warning: statement has no effect [-Wunused-value]
   33 | #define debug(x...)         42
      |                             ^~
burza.cpp:109:5: note: in expansion of macro 'debug'
  109 |     debug(p);
      |     ^~~~~
burza.cpp:33:29: warning: statement has no effect [-Wunused-value]
   33 | #define debug(x...)         42
      |                             ^~
burza.cpp:110:5: note: in expansion of macro 'debug'
  110 |     debug(at_dist_k);
      |     ^~~~~
burza.cpp:33:29: warning: statement has no effect [-Wunused-value]
   33 | #define debug(x...)         42
      |                             ^~
burza.cpp:111:5: note: in expansion of macro 'debug'
  111 |     debug(last);
      |     ^~~~~

• Subtask 1: 16 / 16
• Subtask 2: 16 / 16
• Subtask 3: 16 / 16
• Subtask 4: 16 / 16
• Subtask 5: 16 / 16
• Subtask 6: 16 / 16
• Subtask 7: 16 / 16
• Subtask 8: 16 / 16
• Subtask 9: 16 / 16
• Subtask 10: 16 / 16