제출 #1081118

#제출 시각아이디문제언어결과실행 시간메모리
1081118underwaterkillerwhaleJail (JOI22_jail)C++17
49 / 100
57 ms20572 KiB
#include <bits/stdc++.h> #define ll long long #define rep(i,m,n) for(int i=(m); i<=(n); i++) #define reb(i,m,n) for(int i=(m); i>=(n); i--) #define pii pair<int,int> #define pll pair<ll,ll> #define MP make_pair #define fs first #define se second #define bit(msk, i) ((msk >> i) & 1) #define iter(id, v) for(auto id : v) #define pb push_back #define SZ(v) (ll)v.size() #define ALL(v) v.begin(),v.end() using namespace std; mt19937_64 rd(chrono :: steady_clock :: now ().time_since_epoch().count()); ll Rand (ll l, ll r) { return uniform_int_distribution<ll> (l, r) (rd); } const int N = 1e5 + 7; const int Mod = 1e9 + 7; const int INF = 1e9; const ll BASE = 137; const int szBL = 320; int n, m, Q; vector<int> ke[N], ke2[N]; int high[N], pa[N]; int S[N], E[N]; pii qr[N]; void pdfs (int u, int p) { high[u] = high[p] + 1; pa[u] = p; iter (&v, ke[u]) { if (v != p) pdfs(v, u); } } int num[N], low[N], del[N]; int time_dfs = 0; bool ok = 1; stack<int> st; void dfs (int u) { num[u] = low[u] = ++time_dfs; st.push(u); iter (&v, ke2[u]) { if (del[v]) continue; if (!num[v]) { dfs(v); low[u] = min(low[u], low[v]); } else low[u] = min(low[u], num[v]); } if (num[u] == low[u]) { int v; int num = 0; do { v = st.top(); st.pop(); num ++; del[v] = 1; }while (v != u); if (num > 1) ok = 0; } } void solution () { time_dfs = 0; ok = 1; rep (i, 1, n) vector<int> ().swap(ke[i]), vector<int> ().swap(ke2[i]), E[i] = S[i] = num[i] = low[i] = del[i] = 0; cin >> n; rep (i, 1, n - 1) { int u, v; cin >> u>> v; ke[u].pb(v); ke[v].pb(u); } pdfs(1, 0); cin >> m; rep (i, 1, m) { cin >> qr[i].fs >> qr[i].se; S[qr[i].fs] = i; E[qr[i].se] = i; } rep (i, 1, m) { int u = qr[i].fs, v = qr[i].se; while (u != v) { if (high[u] > high[v]) swap(u, v); if (E[v]) ke2[i].pb(E[v]); if (S[v]) ke2[S[v]].pb(i); v = pa[v]; } if (E[v]) ke2[i].pb(E[v]); if (S[v]) ke2[S[v]].pb(i); } rep (i, 1, m) if (!num[i]) dfs(i); if (ok) cout <<"Yes\n"; else cout<<"No\n"; } #define file(name) freopen(name".inp","r",stdin); \ freopen(name".out","w",stdout); int main () { // file("c"); ios_base :: sync_with_stdio(false); cin.tie(0); cout.tie(0); int num_Test = 1; cin >> num_Test; while (num_Test--) solution(); } /* no bug challenge +4 mình có muốn dùng mảng này không? 4 5 1 3 4 1 1 2 3 2 2 1 return->break */
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