제출 #700932

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
700932		ljuba	Jail (JOI22_jail)	C++17	0 / 100	20 ms	592 KiB

jail

#include <bits/stdc++.h>
 
using namespace std;
 
typedef long long ll;
typedef long double ld;
 
typedef vector<int> vi;
typedef vector<ll> vll;
 
typedef vector<vi> vvi;
typedef vector<vll> vvll;
 
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
 
typedef vector<pii> vpii;
typedef vector<pll> vpll;
 
typedef vector<vpii> vvpii;
typedef vector<vpll> vvpll;
 
#define pb push_back
#define mp make_pair
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define sz(x) (int)(x).size()
#define fi first
#define se second
 
template<class T> bool ckmin(T &a, const T &b) {return a > b ? a = b, 1 : 0;}
template<class T> bool ckmax(T &a, const T &b) {return a < b ? a = b, 1 : 0;}
 
namespace debug {
    void __print(int x) {cerr << x;}
    void __print(long long x) {cerr << x;}
    void __print(double x) {cerr << x;}
    void __print(long double x) {cerr << x;}
    void __print(char x) {cerr << '\'' << x << '\'';}
    void __print(const string &x) {cerr << '\"' << x << '\"';}
    void __print(const char *x) {cerr << '\"' << x << '\"';}
    void __print(bool x) {cerr << (x ? "true" : "false");}
 
    template<typename T, typename V>
    void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';}
    template<typename T>
    void __print(const T &x) {int f = 0; cerr << '{'; for(auto z : x) cerr << (f++ ? "," : ""), __print(z); cerr << "}";}
    void _print() {cerr << "]\n";}
    template <typename T, typename... V>
    void _print(T t, V... v) {__print(t); if(sizeof...(v)) cerr << ", "; _print(v...);}
 
#ifdef DEBUG
#define dbg(x...) cerr << "\e[91m" << "LINE(" << __LINE__ << ") -> " << "[" << #x << "] = ["; _print(x); cerr << "\033[0m";
#else
#define dbg(x...)
#endif
}
 
using namespace debug;
 
const char nl = '\n';
 
mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
 
void solve() {
    int n;
    cin >> n;

    vvi adj(n);

    for(int i = 1; i < n; ++i) {
        int u, v;
        cin >> u >> v;
        --u, --v;
        adj[u].pb(v);
        adj[v].pb(u);
    }

    const int LOG = 18;

    vvi up(n, vi(LOG, -1));
    vi dep(n);

    auto dfs = [&](auto &dfs, int s, int p) -> void {
        up[s][0] = p;

        for(int i = 1; i < LOG; ++i) {
            if(up[s][i - 1] == -1) {
                break;
            }

            up[s][i] = up[up[s][i - 1]][i - 1];
        }

        for(auto e : adj[s]) {
            if(e == p) continue;
            dep[e] = dep[s] + 1;
            dfs(dfs, e, s);
        }
    };

    dfs(dfs, 0, -1);

    set<pii> ima;

    auto lca = [&](int u, int v) {
        if(dep[u] <= dep[v]) swap(u, v);

        int k = dep[u] - dep[v];

        for(int i = 0; i < LOG; ++i) {
            if((k >> i) & 1) {
                u = up[u][i];
            }
        }

        if(u == v) return u;

        for(int i = LOG - 1; i >= 0; --i) {
            if(up[u][i] != up[v][i]) {
                u = up[u][i];
                v = up[v][i];
            }
        }

        return up[u][0];
    };

    int t;
    cin >> t;

    while(t--) {
        int u, v;
        cin >> u >> v;
        --u, --v;

        int tren = u;

        int rodjak = lca(u, v);

        while(tren != rodjak) {
            int novi = up[tren][0];
            ima.insert({tren, novi});
            tren = novi;
        }

        tren = v;

        while(tren != rodjak) {
            int novi = up[tren][0];
            ima.insert({novi, tren});
            tren = novi;
        }
    }

    for(auto z : ima) {
        auto prvi = z;
        pii drugi = {prvi.se, prvi.fi};

        if(ima.count(drugi)) {
            cout << "No" << nl;
            return;
        }
    }

    cout << "Yes" << nl;
}
 
int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
 
    int testCases = 1;
    cin >> testCases;
    while(testCases--)
        solve();
}

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