Submission #2504609
Source Code Expand
#include <utility> #include <cstddef> #include <numeric> #include <stack> #include <iostream> #include <functional> #include <vector> #include <string> #include <array> #include <algorithm> namespace loquat { using vertex_t = size_t; } namespace loquat { namespace edge_param { struct to_ { vertex_t to; explicit to_(vertex_t t = 0) : to(t) { } }; } namespace detail { template <typename T, typename... Params> struct edge_param_wrapper : public T, edge_param_wrapper<Params...> { }; template <typename T> struct edge_param_wrapper<T> : public T { template <typename U> explicit edge_param_wrapper(U&& x) : T(std::forward<U>(x)) { } }; } template <typename... Params> struct edge : public detail::edge_param_wrapper<edge_param::to_, Params...> { template <typename... Args> explicit edge(Args&&... args) : detail::edge_param_wrapper<edge_param::to_, Params...>( std::forward<Args>(args)...) { } }; } namespace loquat { template <typename EdgeType> class adjacency_list { public: using edge_type = EdgeType; using edge_list = std::vector<edge_type>; private: std::vector<std::vector<EdgeType>> m_edges; public: explicit adjacency_list(size_t n) : m_edges(n) { } size_t size() const { return m_edges.size(); } const edge_list& operator[](vertex_t u) const { return m_edges[u]; } edge_list& operator[](vertex_t u){ return m_edges[u]; } template <typename... Args> void add_edge(vertex_t from, Args&&... args){ m_edges[from].emplace_back(std::forward<Args>(args)...); } }; } namespace loquat { template <typename EdgeType, typename Behavior, typename... Args> std::vector<typename Behavior::state_type> undirected_tree_dynamic_programming( const adjacency_list<EdgeType>& graph, Behavior behavior, Args&&... args) { using state_type = typename Behavior::state_type; using frame_type = std::pair<vertex_t, size_t>; const size_t n = graph.size(); std::vector<state_type> temporary(n), result(n); for(vertex_t v = 0; v < n; ++v){ temporary[v] = behavior.initial(v, args...); } std::stack<frame_type> frames; frames.emplace(0, 0); while(!frames.empty()){ const auto frame = frames.top(); frames.pop(); const auto u = frame.first; const auto i = frame.second; const vertex_t p = (frames.empty() ? u : frames.top().first); if(i == graph[u].size()){ for(const auto& e : graph[u]){ if(e.to == p){ continue; } const auto& x = temporary[e.to]; const auto& y = temporary[u]; temporary[u] = behavior.merge(y, x, u, e, args...); } }else{ const auto& e = graph[u][i]; frames.emplace(u, i + 1); if(e.to != p){ frames.emplace(e.to, 0); } } } frames.emplace(0, 0); result[0] = temporary[0]; while(!frames.empty()){ const auto frame = frames.top(); frames.pop(); const auto u = frame.first; const auto i = frame.second; const vertex_t p = (frames.empty() ? u : frames.top().first); if(i == 0){ for(const auto& e : graph[u]){ if(e.to == p){ const auto& x = temporary[e.to]; const auto& y = temporary[u]; result[u] = behavior.merge(y, x, u, e, args...); break; } } } if(i != graph[u].size()){ const auto& e = graph[u][i]; frames.emplace(u, i + 1); if(e.to != p){ const auto& x = temporary[e.to]; const auto& y = result[u]; temporary[u] = behavior.purge(y, x, u, e, args...); frames.emplace(e.to, 0); } } } return result; } } namespace loquat { template <typename T, size_t K, typename Comparator = std::less<T>> class top_k { public: using value_type = T; private: Comparator m_comparator; size_t m_size; std::array<T, K> m_data; public: top_k() : m_comparator() , m_size(0) , m_data() { } bool empty() const { return m_size == 0; } size_t size() const { return m_size; } const value_type& operator[](size_t i) const { return m_data[i]; } void push(const value_type& x){ if(m_size == K && !m_comparator(x, m_data[m_size - 1])){ return; } if(m_size == K){ m_data[m_size - 1] = x; }else{ m_data[m_size++] = x; } for(size_t i = m_size - 1; i > 0; --i){ if(m_comparator(m_data[i], m_data[i - 1])){ std::swap(m_data[i], m_data[i - 1]); } } } }; } using namespace std; using edge = loquat::edge<>; struct behavior { using state_type = loquat::top_k<int, 2, std::greater<int>>; using edge_type = edge; state_type initial(loquat::vertex_t v, const vector<int>& c) const { state_type s; s.push(c[v]); return s; } state_type merge( state_type y, const state_type& x, loquat::vertex_t u, const edge_type& e, const vector<int>& c) const { if(!x.empty()){ y.push(x[0] + c[u]); } return y; } state_type purge( const state_type& y, const state_type& x, loquat::vertex_t u, const edge_type& e, const vector<int>& c) const { if(!x.empty() && !y.empty() && y[0] == x[0] + c[u]){ state_type z; if(y.size() > 1){ z.push(y[1]); } return z; }else{ return y; } } }; int main(){ ios_base::sync_with_stdio(false); int n; cin >> n; loquat::adjacency_list<edge> g(n); for(int i = 1; i < n; ++i){ int a, b; cin >> a >> b; --a; --b; g.add_edge(a, b); g.add_edge(b, a); } string s; cin >> s; vector<int> deg(n); for(int i = 0; i < n; ++i){ deg[i] = g[i].size(); } for(int i = 0; i < n; ++i){ int u = i; while(deg[u] == 1 && s[u] == 'B'){ int v = -1; for(const auto& e : g[u]){ v = e.to; if(deg[v] > 0){ break; } } --deg[u]; --deg[v]; u = v; } } vector<int> c(n); for(int i = 0; i < n; ++i){ const int x = (s[i] == 'W' ? 0 : 1); c[i] = 1 - (x ^ (deg[i] & 1)); } const auto dp = loquat::undirected_tree_dynamic_programming(g, behavior(), c); int shortcut = 0; for(const auto& p : dp){ if(!p.empty()){ shortcut = max(shortcut, p[0]); } } const int d = shortcut * 2 - accumulate(c.begin(), c.end(), 0); int k = 0; for(int i = 0; i < n; ++i){ if(deg[i] > 0){ ++k; } } if(k == 0){ cout << (find(s.begin(), s.end(), 'W') != s.end() ? 1 : 0) << endl; }else{ const int answer = (k - 1) * 2 - d; cout << answer << endl; } return 0; }
Submission Info
Submission Time | |
---|---|
Task | F - Monochrome Cat |
User | logicmachine |
Language | C++14 (GCC 5.4.1) |
Score | 800 |
Code Size | 6319 Byte |
Status | AC |
Exec Time | 67 ms |
Memory | 12952 KB |
Judge Result
Set Name | Sample | All | ||||
---|---|---|---|---|---|---|
Score / Max Score | 0 / 0 | 800 / 800 | ||||
Status |
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Set Name | Test Cases |
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Sample | 0_000.txt, 0_001.txt, 0_002.txt, 0_003.txt |
All | 0_000.txt, 0_001.txt, 0_002.txt, 0_003.txt, 1_003.txt, 1_004.txt, 1_005.txt, 1_006.txt, 1_007.txt, 1_008.txt, 1_009.txt, 1_010.txt, 1_011.txt, 1_012.txt, 1_013.txt, 1_014.txt, 1_015.txt, 1_016.txt, 1_017.txt, 1_018.txt, 1_019.txt, 1_020.txt, 1_021.txt, 1_022.txt, 1_023.txt, 1_024.txt, 1_025.txt, 1_026.txt, 1_027.txt, 1_028.txt, 1_029.txt, 1_030.txt, 1_031.txt, 1_032.txt, 1_033.txt, 1_034.txt, 1_035.txt, 1_036.txt, 1_037.txt, 1_038.txt, 1_039.txt, 1_040.txt, 1_041.txt, 1_042.txt, 1_043.txt, 1_044.txt, 1_045.txt, 1_046.txt, 1_047.txt, 1_048.txt, 1_049.txt, 1_050.txt, 1_051.txt, 1_052.txt, 1_053.txt, 1_054.txt, 1_055.txt, 1_056.txt, 1_057.txt, 1_058.txt, 1_059.txt, 1_060.txt, 1_061.txt, 1_062.txt, 1_063.txt, 1_064.txt, 1_065.txt, 1_066.txt, 1_067.txt, 1_068.txt, 1_069.txt, 1_070.txt, 1_071.txt, 1_072.txt, 1_073.txt, 1_074.txt, 1_075.txt, 1_076.txt, 1_077.txt, 1_078.txt, 1_079.txt, 1_080.txt, 1_081.txt, 1_082.txt, 1_083.txt, 1_084.txt, 1_085.txt, 1_086.txt, 1_087.txt, 1_088.txt, 1_089.txt, 1_090.txt, 1_091.txt, 1_092.txt, 1_093.txt, 1_094.txt, 1_095.txt, 1_096.txt, 1_097.txt, 1_098.txt, 1_099.txt, 1_100.txt, 1_101.txt, 1_102.txt, 1_103.txt, 1_104.txt, 1_105.txt, 1_106.txt, 1_107.txt, 1_108.txt, 1_109.txt, 1_110.txt, 1_111.txt, 1_112.txt, 1_113.txt, 1_114.txt, 1_115.txt, 1_116.txt |
Case Name | Status | Exec Time | Memory |
---|---|---|---|
0_000.txt | AC | 1 ms | 256 KB |
0_001.txt | AC | 1 ms | 256 KB |
0_002.txt | AC | 1 ms | 256 KB |
0_003.txt | AC | 1 ms | 256 KB |
1_003.txt | AC | 1 ms | 256 KB |
1_004.txt | AC | 1 ms | 256 KB |
1_005.txt | AC | 1 ms | 256 KB |
1_006.txt | AC | 1 ms | 256 KB |
1_007.txt | AC | 1 ms | 256 KB |
1_008.txt | AC | 1 ms | 256 KB |
1_009.txt | AC | 1 ms | 256 KB |
1_010.txt | AC | 1 ms | 256 KB |
1_011.txt | AC | 1 ms | 256 KB |
1_012.txt | AC | 1 ms | 256 KB |
1_013.txt | AC | 1 ms | 256 KB |
1_014.txt | AC | 1 ms | 256 KB |
1_015.txt | AC | 1 ms | 256 KB |
1_016.txt | AC | 1 ms | 256 KB |
1_017.txt | AC | 1 ms | 256 KB |
1_018.txt | AC | 1 ms | 256 KB |
1_019.txt | AC | 1 ms | 256 KB |
1_020.txt | AC | 1 ms | 256 KB |
1_021.txt | AC | 1 ms | 256 KB |
1_022.txt | AC | 1 ms | 256 KB |
1_023.txt | AC | 1 ms | 256 KB |
1_024.txt | AC | 1 ms | 256 KB |
1_025.txt | AC | 1 ms | 256 KB |
1_026.txt | AC | 1 ms | 256 KB |
1_027.txt | AC | 1 ms | 256 KB |
1_028.txt | AC | 1 ms | 256 KB |
1_029.txt | AC | 1 ms | 256 KB |
1_030.txt | AC | 1 ms | 256 KB |
1_031.txt | AC | 1 ms | 256 KB |
1_032.txt | AC | 1 ms | 256 KB |
1_033.txt | AC | 1 ms | 256 KB |
1_034.txt | AC | 1 ms | 256 KB |
1_035.txt | AC | 1 ms | 256 KB |
1_036.txt | AC | 1 ms | 256 KB |
1_037.txt | AC | 1 ms | 256 KB |
1_038.txt | AC | 1 ms | 256 KB |
1_039.txt | AC | 3 ms | 256 KB |
1_040.txt | AC | 1 ms | 256 KB |
1_041.txt | AC | 1 ms | 256 KB |
1_042.txt | AC | 1 ms | 256 KB |
1_043.txt | AC | 1 ms | 256 KB |
1_044.txt | AC | 1 ms | 256 KB |
1_045.txt | AC | 21 ms | 4664 KB |
1_046.txt | AC | 25 ms | 5792 KB |
1_047.txt | AC | 63 ms | 12288 KB |
1_048.txt | AC | 48 ms | 9600 KB |
1_049.txt | AC | 42 ms | 8880 KB |
1_050.txt | AC | 38 ms | 8064 KB |
1_051.txt | AC | 33 ms | 9332 KB |
1_052.txt | AC | 9 ms | 2556 KB |
1_053.txt | AC | 38 ms | 10484 KB |
1_054.txt | AC | 16 ms | 4344 KB |
1_055.txt | AC | 32 ms | 9204 KB |
1_056.txt | AC | 20 ms | 5752 KB |
1_057.txt | AC | 2 ms | 512 KB |
1_058.txt | AC | 28 ms | 5760 KB |
1_059.txt | AC | 22 ms | 4480 KB |
1_060.txt | AC | 49 ms | 9216 KB |
1_061.txt | AC | 56 ms | 10240 KB |
1_062.txt | AC | 27 ms | 5760 KB |
1_063.txt | AC | 31 ms | 7292 KB |
1_064.txt | AC | 23 ms | 5244 KB |
1_065.txt | AC | 4 ms | 896 KB |
1_066.txt | AC | 45 ms | 9720 KB |
1_067.txt | AC | 10 ms | 2432 KB |
1_068.txt | AC | 28 ms | 6268 KB |
1_069.txt | AC | 15 ms | 3328 KB |
1_070.txt | AC | 28 ms | 5760 KB |
1_071.txt | AC | 54 ms | 9984 KB |
1_072.txt | AC | 32 ms | 6272 KB |
1_073.txt | AC | 6 ms | 1280 KB |
1_074.txt | AC | 4 ms | 896 KB |
1_075.txt | AC | 25 ms | 5248 KB |
1_076.txt | AC | 56 ms | 11648 KB |
1_077.txt | AC | 51 ms | 9728 KB |
1_078.txt | AC | 18 ms | 3712 KB |
1_079.txt | AC | 24 ms | 5120 KB |
1_080.txt | AC | 29 ms | 5888 KB |
1_081.txt | AC | 61 ms | 12240 KB |
1_082.txt | AC | 60 ms | 12264 KB |
1_083.txt | AC | 67 ms | 12952 KB |
1_084.txt | AC | 65 ms | 12240 KB |
1_085.txt | AC | 55 ms | 12752 KB |
1_086.txt | AC | 56 ms | 12880 KB |
1_087.txt | AC | 41 ms | 12148 KB |
1_088.txt | AC | 42 ms | 12148 KB |
1_089.txt | AC | 44 ms | 12148 KB |
1_090.txt | AC | 45 ms | 12148 KB |
1_091.txt | AC | 42 ms | 12148 KB |
1_092.txt | AC | 45 ms | 12148 KB |
1_093.txt | AC | 63 ms | 12236 KB |
1_094.txt | AC | 63 ms | 12620 KB |
1_095.txt | AC | 67 ms | 12364 KB |
1_096.txt | AC | 62 ms | 12592 KB |
1_097.txt | AC | 62 ms | 12460 KB |
1_098.txt | AC | 64 ms | 12512 KB |
1_099.txt | AC | 52 ms | 12024 KB |
1_100.txt | AC | 51 ms | 12024 KB |
1_101.txt | AC | 57 ms | 12024 KB |
1_102.txt | AC | 57 ms | 12024 KB |
1_103.txt | AC | 52 ms | 12024 KB |
1_104.txt | AC | 54 ms | 12024 KB |
1_105.txt | AC | 59 ms | 11984 KB |
1_106.txt | AC | 61 ms | 11980 KB |
1_107.txt | AC | 60 ms | 11984 KB |
1_108.txt | AC | 67 ms | 11980 KB |
1_109.txt | AC | 56 ms | 11980 KB |
1_110.txt | AC | 62 ms | 11980 KB |
1_111.txt | AC | 60 ms | 11984 KB |
1_112.txt | AC | 61 ms | 11980 KB |
1_113.txt | AC | 65 ms | 11980 KB |
1_114.txt | AC | 65 ms | 11980 KB |
1_115.txt | AC | 58 ms | 11984 KB |
1_116.txt | AC | 58 ms | 11984 KB |