結果
問題 | No.2677 Minmax Independent Set |
ユーザー |
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提出日時 | 2024-03-15 23:17:55 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 254 ms / 2,000 ms |
コード長 | 6,582 bytes |
コンパイル時間 | 2,436 ms |
コンパイル使用メモリ | 205,660 KB |
最終ジャッジ日時 | 2025-02-20 06:04:27 |
ジャッジサーバーID (参考情報) |
judge3 / judge2 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 61 |
ソースコード
#line 1 "test.cpp" //#pragma GCC target("avx,avx2") //#pragma GCC optimize("O3") //#pragma GCC optimize("unroll-loops") #include<bits/stdc++.h> #ifdef LOCAL #include <debug.hpp> #define debug(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__) #else #define debug(...) (static_cast<void>(0)) #endif using namespace std; using ll = long long; using ull = unsigned long long; using ld = long double; using pll = pair<ll, ll>; using pii = pair<int, int>; using vi = vector<int>; using vvi = vector<vi>; using vvvi = vector<vvi>; using vl = vector<ll>; using vvl = vector<vl>; using vvvl = vector<vvl>; using vul = vector<ull>; using vpii = vector<pii>; using vpll = vector<pll>; using vs = vector<string>; template<class T> using pq = priority_queue<T, vector<T>, greater<T>>; #define overload4(_1, _2, _3, _4, name, ...) name #define overload3(a,b,c,name,...) name #define rep1(n) for (ll UNUSED_NUMBER = 0; UNUSED_NUMBER < (n); ++UNUSED_NUMBER) #define rep2(i, n) for (ll i = 0; i < (n); ++i) #define rep3(i, a, b) for (ll i = (a); i < (b); ++i) #define rep4(i, a, b, c) for (ll i = (a); i < (b); i += (c)) #define rep(...) overload4(__VA_ARGS__, rep4, rep3, rep2, rep1)(__VA_ARGS__) #define rrep1(n) for(ll i = (n) - 1;i >= 0;i--) #define rrep2(i,n) for(ll i = (n) - 1;i >= 0;i--) #define rrep3(i,a,b) for(ll i = (b) - 1;i >= (a);i--) #define rrep4(i,a,b,c) for(ll i = (a) + ((b)-(a)-1) / (c) * (c);i >= (a);i -= c) #define rrep(...) overload4(__VA_ARGS__, rrep4, rrep3, rrep2, rrep1)(__VA_ARGS__) #define all1(i) begin(i) , end(i) #define all2(i,a) begin(i) , begin(i) + a #define all3(i,a,b) begin(i) + a , begin(i) + b #define all(...) overload3(__VA_ARGS__, all3, all2, all1)(__VA_ARGS__) #define sum(...) accumulate(all(__VA_ARGS__),0LL) template<class T> bool chmin(T &a, const T &b){ if(a > b){ a = b; return 1; } else return 0; } template<class T> bool chmax(T &a, const T &b){ if(a < b){ a = b; return 1; } else return 0; } template<class T> auto min(const T& a){return *min_element(all(a));} template<class T> auto max(const T& a){return *max_element(all(a));} template<class... Ts> void in(Ts&... t); #define INT(...) int __VA_ARGS__; in(__VA_ARGS__) #define LL(...) ll __VA_ARGS__; in(__VA_ARGS__) #define STR(...) string __VA_ARGS__; in(__VA_ARGS__) #define CHR(...) char __VA_ARGS__; in(__VA_ARGS__) #define DBL(...) double __VA_ARGS__; in(__VA_ARGS__) #define LD(...) ld __VA_ARGS__; in(__VA_ARGS__) #define VEC(type, name, size) vector<type> name(size); in(name) #define VV(type, name, h, w) vector<vector<type>> name(h, vector<type>(w)); in(name) ll intpow(ll a, ll b){ ll ans = 1; while(b){if(b & 1) ans *= a; a *= a; b /= 2;} return ans;} ll modpow(ll a, ll b, ll p){ ll ans = 1; a %= p;if(a < 0) a += p;while(b){ if(b & 1) (ans *= a) %= p; (a *= a) %= p; b /= 2; } return ans; } void Yes() {cout << "Yes\n";return;} void No() {cout << "No\n";return;} void YES() {cout << "YES\n";return;} void NO() {cout << "NO\n";return;} namespace IO{ #define VOID(a) decltype(void(a)) struct setting{ setting(){cin.tie(nullptr); ios::sync_with_stdio(false);fixed(cout); cout.precision(12);}} setting; template<int I> struct P : P<I-1>{}; template<> struct P<0>{}; template<class T> void i(T& t){ i(t, P<3>{}); } void i(vector<bool>::reference t, P<3>){ int a; i(a); t = a; } template<class T> auto i(T& t, P<2>) -> VOID(cin >> t){ cin >> t; } template<class T> auto i(T& t, P<1>) -> VOID(begin(t)){ for(auto&& x : t) i(x); } template<class T, size_t... idx> void ituple(T& t, index_sequence<idx...>){in(get<idx>(t)...);} template<class T> auto i(T& t, P<0>) -> VOID(tuple_size<T>{}){ituple(t, make_index_sequence<tuple_size<T>::value>{});} #undef VOID } #define unpack(a) (void)initializer_list<int>{(a, 0)...} template<class... Ts> void in(Ts&... t){ unpack(IO :: i(t)); } #undef unpack static const double PI = 3.1415926535897932; template <class F> struct REC { F f; REC(F &&f_) : f(forward<F>(f_)) {} template <class... Args> auto operator()(Args &&...args) const { return f(*this, forward<Args>(args)...); }}; constexpr int mod = 998244353; //constexpr int mod = 1000000007; #line 2 "library/tree/Rerooting.hpp" template <typename T, typename G, typename F1, typename F2> struct Rerooting { const G &g; const F1 f1; const F2 f2; vector<T> memo,memo2,dp; T I; Rerooting(const G &_g, const F1 _f1, const F2 _f2, const T &I_) : g(_g), f1(_f1), f2(_f2), memo(g.size(), I_), memo2(g.size(),I_),dp(g.size(), I_), I(I_) { dfs(0, -1); efs(0, -1, I); } const T &operator[](int i) const { return dp[i]; } void dfs(int cur, int par) { for (auto &dst : g[cur]) { if (dst == par) continue; dfs(dst, cur); memo[cur] = f1(memo[cur], f2(memo[dst], dst, cur)); } } void efs(int cur, int par, const T &pval) { // get cumulative sum vector<T> buf; for (auto dst : g[cur]) { if (dst == par) continue; buf.push_back(f2(memo[dst], dst, cur)); } vector<T> head(buf.size() + 1), tail(buf.size() + 1); head[0] = tail[buf.size()] = I; for (int i = 0; i < (int)buf.size(); i++) head[i + 1] = f1(head[i], buf[i]); for (int i = (int)buf.size() - 1; i >= 0; i--) tail[i] = f1(tail[i + 1], buf[i]); memo2[cur] = pval; // update dp[cur] = par == -1 ? head.back() : f1(pval, head.back()); // propagate int idx = 0; for (auto &dst : g[cur]) { if (dst == par) continue; efs(dst, cur, f2(f1(pval, f1(head[idx], tail[idx + 1])), cur, dst)); idx++; } } }; #line 90 "test.cpp" int main() { INT(n); vvi g(n); rep(i,n-1) { INT(u,v); u--,v--; g[u].emplace_back(v); g[v].emplace_back(u); } using T = pii; // identify element of f1, and answer of leaf T I = {0,0}; // merge value of child node auto f1 = [&](T x, T y) -> T { T ret; ret.first = x.first + y.first; ret.second = max(x.first,x.second) + max(y.first,y.second); return ret; }; // return value from child node to parent node auto f2 = [&](T x, int chd, int par) -> T { T ret; ret.first = max(x.first,x.second); ret.second = max(x.second,x.first + 1); return ret; }; Rerooting<T, decltype(g), decltype(f1), decltype(f2)> dp(g, f1, f2, I); debug(dp.dp,dp.memo,dp.memo2); int ans = n; rep(i,n) chmin(ans,dp.dp[i].first + 1); cout << ans << '\n'; }