結果
問題 | No.2892 Lime and Karin |
ユーザー | 👑 Nachia |
提出日時 | 2024-09-13 22:49:29 |
言語 | C++17(gcc12) (gcc 12.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 155 ms / 8,000 ms |
コード長 | 3,531 bytes |
コンパイル時間 | 1,152 ms |
コンパイル使用メモリ | 89,064 KB |
実行使用メモリ | 13,684 KB |
最終ジャッジ日時 | 2024-09-13 22:49:58 |
合計ジャッジ時間 | 6,920 ms |
ジャッジサーバーID (参考情報) |
judge6 / judge2 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 52 |
ソースコード
#ifdef NACHIA #define _GLIBCXX_DEBUG #else #define NDEBUG #endif #include <iostream> #include <string> #include <vector> #include <algorithm> using i64 = long long; using u64 = unsigned long long; #define rep(i,n) for(int i=0; i<int(n); i++) const i64 INF = 1001001001001001001; template<typename A> void chmin(A& l, const A& r){ if(r < l) l = r; } template<typename A> void chmax(A& l, const A& r){ if(l < r) l = r; } #include <atcoder/modint> using Modint = atcoder::static_modint<998244353>; using namespace std; void testcase(){ int N; cin >> N; 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> aw(N); { string s; cin >> s; rep(i,N) aw[i] = (s[i] == '1' ? 1 : -1); } vector<int> parent(N, -1); vector<int> Z(N, 1); { vector<int> bfs; bfs.push_back(0); rep(i,N){ int v = bfs[i]; for(int w : adj[v]) if(parent[v] != w){ parent[w] = v; bfs.push_back(w); } } for(int i=N-1; i>=1; i--) Z[parent[bfs[i]]] += Z[bfs[i]]; } //cout << "##" << endl; i64 ans = 0; auto flushTable = [&](int off, const vector<int>& c, int root) -> i64 { auto cs = vector<int>(c.size()+1); rep(i,c.size()) cs[i+1] += cs[i] + c[i]; i64 cc = i64(cs.back()) * i64(cs.back()); for(i64 i=0; i<i64(c.size()); i++){ i64 j = off - (i + root - off); if(j >= 0) cc -= i64(c[i]) * i64(cs[min<i64>(cs.size() - 1, j + 1)]); } return cc; }; //for(auto p : parent) cout << p << " "; //cout << endl; //for(auto p : Z) cout << p << " "; //cout << endl; auto cd = [&](auto& cd, int v) -> void { while(true){ int nx = -1; for(int w : adj[v]) if(Z[w] * 2 > Z[v]){ Z[v] -= Z[w]; Z[w] += Z[v]; parent[v] = w; parent[w] = -1; nx = w; break; } if(nx >= 0) v = nx; else break; } //cout << "v = " << v << endl; int off = Z[v]; vector<int> cnt(Z[v] * 2 + 1); cnt[off] += 1; int rootaw = aw[v]; Z[v] = 0; for(int w : adj[v]) if(Z[w] != 0){ //cout << "w = " << w << endl; parent[w] = -1; int offw = Z[w]; vector<int> cntw(Z[w] * 2 + 1); vector<pair<int, int>> bfs; bfs.push_back({ w, 0 }); rep(q,bfs.size()){ auto [x,c] = bfs[q]; //cout << "x = " << x << " , c = " << c << endl; c += aw[x]; cntw[c + offw] += 1; cnt[c + off] += 1; for(int y : adj[x]) if(Z[y] != 0 && parent[x] != y){ bfs.push_back({ y, c }); } } //cout << "v = " << v << " , w = " << w << endl; //for(auto a : cntw) cout << a << " "; //cout << endl; ans -= flushTable(offw, cntw, aw[v]); cd(cd, w); } // cout << "v = " << v << endl; // for(auto a : cnt) cout << a << " "; // cout << endl; ans += flushTable(off, cnt, aw[v]); }; rep(i,N) if(aw[i] > 0) ans += 1; cd(cd, 0); ans /= 2; cout << ans << endl; } int main(){ ios::sync_with_stdio(false); cin.tie(nullptr); testcase(); return 0; }