Submission #1082458

#	Time	Username	Problem	Language	Result	Execution time	Memory
1082458		underwaterkillerwhale	Jail (JOI22_jail)	C++17	49 / 100	65 ms	53844 KiB

jail

#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];
pii qr[N];

int high[N], nC[N], pa[N], time_dfs;

int ein[N], Head[N];

int num_Ver = 0;

vector<int> ke2[N << 3];

int num[N << 3], low[N << 3 ], del[N << 3], time_dfs2 = 0;///aware
stack<int> st;

bool Ans;

//pii rr[N << 3];

struct Segment_Tree_st {
    int m;
    int st[N << 2], lab[N << 2];

    void build (int id, int l, int r, int typ) {
        ++num_Ver;
        lab[id] = num_Ver;
//        cout << l <<","<<r<<","<<typ<<" "<<num_Ver<<"\n";
        if (l == r) {
            return;
        }
        int mid = l + r >> 1;
        build (id << 1, l, mid, typ);
        build (id << 1 | 1, mid + 1, r, typ);
        if (typ == 0)
            ke2[lab[id << 1]].pb(lab[id]), ke2[lab[id << 1 | 1]].pb(lab[id]);
        else
            ke2[lab[id]].pb(lab[id << 1]), ke2[lab[id]].pb(lab[id << 1 | 1]);
    }

    int get (int id, int l, int r, int pos) {
        if (l > pos || r < pos) return -1;
        if (l == r) return lab[id];
        int mid = l + r >> 1;
        return max(get (id << 1, l, mid, pos), get (id << 1 | 1, mid + 1, r, pos));
    }

    void add_edge (int id, int l, int r, int u, int v, int clab, int typ) {
        if (l > v || r < u) return;
        if (l >= u && r <= v) {
            if (typ == 0) {
                ke2[lab[id]].pb(clab);
//                cout << lab[id]<< " "<<clab<<" b\n";
            }
            else {
                ke2[clab].pb(lab[id]);
//                cout << clab<<" "<<lab[id]<<" c\n";
            }
            return;
        }
        int mid = l + r >> 1;
        add_edge (id << 1, l, mid, u, v, clab, typ);
        add_edge (id << 1 | 1, mid + 1, r, u, v, clab, typ);
    }

    void add_edge1 (int u, int v, int clab, int st, int ed, int typ) {
        if (typ == 0) {
            if (u == ein[st]) ++u;
            if (v == ein[st]) --v;
        }
        else {
            if (u == ein[ed]) ++u;
            if (v == ein[ed]) --v;
        }
//        cout << u <<" "<<v<<" "<<ein[st]<<" "<<typ<<" hihi\n";
        add_edge (1, 1, m, u, v, clab, typ);
    }

    int get (int pos) {
        return get (1, 1, m, pos);
    }

    void init (int n, int typ) {
        m = n;
        build (1, 1, m, typ);
    }
}STs, STe;

void pdfs (int u, int p) {
    high[u] = high[p] + 1;
    pa[u] = p;
    nC[u] = 1;
    iter (&v, ke[u]) if (v != p) {
        pdfs (v, u);
        nC[u] += nC[v];
    }
}

void hld (int u, int p) {
    ein[u] = ++time_dfs;
    Head[u] = p;
    int mxV = -1;
    iter (&v, ke[u]) if (v != pa[u] && (mxV == -1 || nC[v] > nC[mxV])) mxV = v;
    if (mxV != -1) hld(mxV, p);
    iter (&v, ke[u]) {
        if (v == pa[u] || v == mxV) continue;
        hld(v, v);
    }
}

void query (int st, int ed) {
    int u = st, v = ed, labs = STs.get(ein[st]), labe = STe.get(ein[ed]);
    ke2[labe].pb(labs);
//    cout << labe << " "<<labs<<" a\n";
//    return;
    for (; Head[u] != Head[v]; v = pa[Head[v]]) {
        if (high[Head[u]] > high[Head[v]]) swap(u, v);
        STs.add_edge1 (ein[Head[v]], ein[v], labe, st, ed, 0);
        STe.add_edge1 (ein[Head[v]], ein[v], labs, st, ed, 1);
    }
    if (high[u] > high[v]) swap(u, v);
    STs.add_edge1 (ein[u], ein[v], labe, st, ed, 0);
    STe.add_edge1 (ein[u], ein[v], labs, st, ed, 1);
}

void dfs (int u) {
    num[u] = low[u] = ++time_dfs2;
    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_del = 0;
        do {
            v = st.top();
            st.pop();
            del[v] = 1;
//            cout << v<<"\n";
            ++num_del;
        }while (v != u);
        if (num_del > 1) {
            Ans = 0;
//            exit(0);
        }
    }
}

void solution () {
    rep (i, 1, num_Ver) vector<int> ().swap(ke[i]), vector<int> ().swap(ke2[i]), num[i] = low[i] = del[i] = 0;
    time_dfs = time_dfs2 = 0, Ans = 1, num_Ver = 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);
    hld (1, 1);
    STs.init(n, 0);
    STe.init(n, 1);
    cin >> m;
    rep (i, 1, m) {
        cin >> qr[i].fs >> qr[i].se;
        query (qr[i].fs, qr[i].se);
    }
    rep (i, 1, m) {
    }
//    cout << num_Ver<<"\n";
    rep (i, 1, num_Ver) {
//        cout << i <<" "<<SZ(ke2[i])<<"\n";
//        iter (&v, ke2[i]) cout <<i<<" "<<v<<"\n";
        if (!num[i]) dfs(i);
    }
    if (Ans) 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
*/

Compilation message (stderr)

jail.cpp: In member function 'void Segment_Tree_st::build(int, int, int, int)':
jail.cpp:57:21: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   57 |         int mid = l + r >> 1;
      |                   ~~^~~
jail.cpp: In member function 'int Segment_Tree_st::get(int, int, int, int)':
jail.cpp:69:21: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   69 |         int mid = l + r >> 1;
      |                   ~~^~~
jail.cpp: In member function 'void Segment_Tree_st::add_edge(int, int, int, int, int, int, int)':
jail.cpp:86:21: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   86 |         int mid = l + r >> 1;
      |                   ~~^~~

• Subtask 1: 0 / 5
• Subtask 2: 5 / 5
• Subtask 3: 16 / 16
• Subtask 4: 28 / 28
• Subtask 5: 0 / 12
• Subtask 6: 0 / 11
• Subtask 7: 0 / 23