結果
問題 | No.2205 Lights Out on Christmas Tree |
ユーザー |
|
提出日時 | 2023-02-03 22:09:48 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 95 ms / 2,000 ms |
コード長 | 4,031 bytes |
コンパイル時間 | 2,026 ms |
コンパイル使用メモリ | 198,640 KB |
最終ジャッジ日時 | 2025-02-10 09:21:44 |
ジャッジサーバーID (参考情報) |
judge4 / judge5 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 37 |
ソースコード
// clang-format off#include <bits/stdc++.h>using namespace std;using ll = long long;using ld = long double;template<class T> using V = vector<T>;using VI = V<int>;using VL = V<ll>;using VS = V<string>;template<class T> using PQ = priority_queue<T, V<T>, greater<T>>;using G = V<VI>;template<class T> using WG = V<V<pair<int, T>>>;#define overload4(_1,_2,_3,_4,name,...) name#define overload3(_1,_2,_3,name,...) name#define rep1(n) for(ll i=0;i<(n);++i)#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 rrep(...) overload3(__VA_ARGS__,rrep3,rrep2,rrep1)(__VA_ARGS__)#define all(a) a.begin(),a.end()#define rall(a) a.rbegin(),a.rend()#define inside(h,w,y,x) (unsigned(y)<h&&unsigned(x)<w)#ifdef _DEBUG#define line cout << "-----------------------------\n"#define debug(...) print(__VA_ARGS__)#else#define line#define debug#endifconstexpr ll INF = 1000000000;constexpr ll LLINF = 1LL << 61;constexpr ll mod = 1000000007;constexpr ll MOD = 998244353;constexpr ld eps = 1e-10;constexpr int dy[]{ -1,0,1,0 }, dx[]{ 0,1,0,-1 };template<class T> inline bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; }return false; }template<class T> inline bool chmin(T& a, const T& b) { if (a > b) { a = b; return true; }return false; }inline void init() { cin.tie(nullptr); cout.tie(nullptr); ios::sync_with_stdio(false); cout << fixed << setprecision(15); }template<class T> inline istream& operator>>(istream& is, V<T>& v) { for (auto& a : v)is >> a; return is; }template<class T, class U> inline istream& operator>>(istream& is, pair<T, U>& p) { is >> p.first >> p.second; return is; }template<class T> inline V<T> vec(size_t a) { return V<T>(a); }template<class T> inline V<T> defvec(T def, size_t a) { return V<T>(a, def); }template<class T, class... Ts> inline auto vec(size_t a, Ts... ts) { return V<decltype(vec<T>(ts...))>(a, vec<T>(ts...)); }template<class T, class... Ts> inline auto defvec(T def, size_t a, Ts... ts) { return V<decltype(defvec<T>(def, ts...))>(a, defvec<T>(def, ts...)); }template<class T> inline void print(const T& a) { cout << a << "\n"; }template<class T, class... Ts> inline void print(const T& a, const Ts&... ts) { cout << a << " "; print(ts...); }template<class T> inline void print(const V<T>& v) { for (int i = 0; i < v.size(); ++i)cout << v[i] << (i == v.size() - 1 ? "\n" : " "); }template<class T> inline void print(const V<V<T>>& v) { for (auto& a : v)print(a); }template<class T> inline constexpr const T cum(const V<T>& a, int l, int r) { return 0 <= l && l <= r && r < a.size() ? a[r] - (l == 0 ? 0 : a[l - 1]): 0; }//[l,r]template<class T> inline constexpr const auto min(const T& v) { return *min_element(all(v)); }template<class T> inline constexpr const auto max(const T& v) { return *max_element(all(v)); }template<class T> inline V<T>& operator++(V<T>& v) { for (T& a : v)++a; return v; }template<class T> inline V<T>& operator--(V<T>& v) { for (T& a : v)--a; return v; }// clang-format onint main() {init();int n;cin >> n;G g(n);rep(n - 1) {int a, b;cin >> a >> b;--a, --b;g[a].push_back(b);g[b].push_back(a);}VI c(n);cin >> c;auto f = [&](auto&& f, int cur, int par) -> pair<int, int> {pair<int, int> res;int v = c[cur];for (int to : g[cur]) {if (to == par) continue;pair<int, int> tmp = f(f, to, cur);v ^= tmp.first;res.second += tmp.second;}if (v == 0) {res.first ^= 1;res.second++;}return res;};auto x = f(f, 0, -1);if (x.first == 0) print(x.second);else print(-1);return 0;}