Submission #948842

#TimeUsernameProblemLanguageResultExecution timeMemory
948842TrendBattlesBurza (COCI16_burza)C++14
160 / 160
35 ms3684 KiB
//https://oj.uz/problem/view/COCI16_burza #include <bits/stdc++.h> using namespace std; using lli = int64_t; #define INFILE "burza.inp" #define OUTFILE "burza.out" int main() { ios::sync_with_stdio(0); cin.tie(0); if (fopen(INFILE, "r")) { freopen(INFILE, "r", stdin); freopen(OUTFILE, "w", stdout); } int n, k; cin >> n >> k; if (k * k >= n) { cout << "DA\n"; return 0; } vector <vector <int>> graph(n + 1); for (int i = 1; i < n; ++i) { int u, v; cin >> u >> v; graph[u].push_back(v); graph[v].push_back(u); } vector <int> leaves_L(n + 1, -1), leaves_R(n + 1, -1), depth(n + 1), parent(n + 1); int vir_l = 0; auto DFS = [&] (auto DFS, int u) { if (depth[u] == k) { leaves_L[u] = vir_l++; leaves_R[u] = vir_l; return; } leaves_L[u] = vir_l; for (int v : graph[u]) { if (v == parent[u]) continue; parent[v] = u; depth[v] = depth[u] + 1; DFS(DFS, v); } leaves_R[u] = vir_l; }; DFS(DFS, 1); vector <vector <int>> list_leaves(vir_l + 5); for (int i = 2; i <= n; ++i) { if (leaves_L[i] == -1) continue; list_leaves[leaves_L[i]].push_back(i); } //for (int i = 1; i <= n; ++i) cerr << leaves_L[i] << ' ' << leaves_R[i] << '\n'; const int limit = ((1 << (k + 1)) >> 6) + 5; vector <vector <lli>> dp(vir_l + 5, vector <lli> (limit)); dp[0][0] = 1; for (int T = 0; T < vir_l; ++T) { for (int mask_block = 0; mask_block < limit; ++mask_block) { for (lli x = dp[T][mask_block]; x; x -= x & -x) { int mask = (mask_block << 6) | __builtin_ctzll(x); //cerr << "DEBUG: "<< T << ' ' << mask << '\n'; for (int nxt : list_leaves[T]) { if (mask >> depth[nxt] & 1) continue; //cerr << "NXT: " << nxt << '\n'; int nxt_mask = mask | (1 << depth[nxt]); dp[leaves_R[nxt]][nxt_mask >> 6] |= 1LL << (nxt_mask & 63); } } } } int exist = false; for (int i = 0; i < limit; ++i) { if (dp[vir_l][i]) { exist = true; break; } } cout << (exist ? "DA" : "NE"); return 0; }

Compilation message (stderr)

burza.cpp: In function 'int main()':
burza.cpp:12:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |         freopen(INFILE, "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~
burza.cpp:13:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |         freopen(OUTFILE, "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
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