Submission #1083653

#	Time	Username	Problem	Language	Result	Execution time	Memory
1083653		ShaShi	Jail (JOI22_jail)	C++17	49 / 100	516 ms	1048576 KiB

jail

#include <bits/stdc++.h>
 
// #define int long long
 
// #pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
// #pragma GCC optimize("O3")
// #pragma GCC optimize("unroll-loops")
 
#define F first 
#define S second
#define mp make_pair
#define pb push_back
#define all(x) x.begin(), x.end()
#define kill(x) cout << x << "\n", exit(0);
#define pii pair<int, int>
#define endl "\n"
 
 
 
using namespace std;
typedef long long ll;
typedef __int128_t lll;
typedef long double ld;
 
const int MAXN = (int)1e6 + 7;
const int MOD = 998244353;
const ll INF = (ll)1e9 + 7;
const int LG = 18;


int n, m, k, tmp, t, tmp2, tmp3, tmp4, u, v, w, flag, q, ans, flag2;
pii arr[MAXN]; int par[MAXN], h[MAXN], pow2dad[MAXN][LG], fake_t[MAXN][LG], fake_s[MAXN][LG], ind_s[MAXN], ind_t[MAXN];
vector<int> adj[MAXN], G[MAXN*40];
int seen[MAXN*40];


inline void add_edge(int u, int v) { G[u].pb(v); }
inline int up(int v, int k) { for (int i=LG-1; i>=0; i--) if (k >= (1<<i)) k -= (1<<i), v = pow2dad[v][i]; return v; }
inline int LCA(int u, int v) { if (h[u] < h[v]) swap(u, v); u = up(u, h[u]-h[v]); if (u == v) return u; for (int i=LG-1; i>=0; i--) if (h[u] >= (1<<i) && pow2dad[u][i] != pow2dad[v][i]) u = pow2dad[u][i], v = pow2dad[v][i]; return pow2dad[u][0]; }



void DFS(int v) {
    for (int u:adj[v]) {
        if (u == par[v]) continue;

        par[u] = v; h[u] = h[v]+1; DFS(u);
    }
}


void DFS2(int v) {
    seen[v] = 1;

    for (int u:G[v]) {
        if (seen[u] == 0) DFS2(u);
        else if (seen[u] == 1) tmp = 0;
    }

    seen[v] = 2;
}


inline void up_s(int v, int k, int ind) {
    // cout << "S : " << v << " " << k << " " << ind << endl;

    for (int i=LG-1; i>=0; i--) {
        if ((1<<i) <= k) {
            k -= (1<<i); add_edge(fake_s[v][i], ind); v = pow2dad[v][i];
        }
    }
}


inline void up_t(int v, int k, int ind) {
    // cout << "T : " << v << " " << k << " " << ind << endl;

    for (int i=LG-1; i>=0; i--) {
        if ((1<<i) <= k) {
            k -= (1<<i); add_edge(ind, fake_t[v][i]); v = pow2dad[v][i];
        }
    }
}


void solve() {
    cin >> n;

    for (int i=1; i<n; i++) {
        cin >> u >> v;

        adj[u].pb(v); adj[v].pb(u);
    }

    cin >> m;

    for (int i=1; i<=m; i++) {
        cin >> u >> v;

        ind_s[u] = i; ind_t[v] = i; arr[i] = {u, v};
    }

    DFS(1); flag = n+1;

    for (int i=1; i<=n; i++) {
        pow2dad[i][0] = par[i];

        fake_s[i][0] = flag++; if (ind_s[i]) add_edge(ind_s[i], fake_s[i][0]);
        fake_t[i][0] = flag++; if (ind_t[i]) add_edge(fake_t[i][0], ind_t[i]);
    }

    for (int j=1; j<LG; j++) {
        for (int i=1; i<=n; i++) {
            pow2dad[i][j] = pow2dad[pow2dad[i][j-1]][j-1];

            fake_s[i][j] = flag++; add_edge(fake_s[i][j-1], fake_s[i][j]); add_edge(fake_s[pow2dad[i][j-1]][j-1], fake_s[i][j]);
            fake_t[i][j] = flag++; add_edge(fake_t[i][j], fake_t[i][j-1]); add_edge(fake_t[i][j], fake_t[pow2dad[i][j-1]][j-1]);
        }
    }


    for (int i=1; i<=m; i++) {
        u = arr[i].F; v = arr[i].S;

        int lca = LCA(u, v);

        if (lca == u) {
            up_s(v, h[v]-h[u], i);
            up_t(par[v], h[v]-h[u], i);
        } else if (lca == v) {
            up_s(par[u], h[u]-h[v], i);
            up_t(u, h[u]-h[v], i);
        } else {
            up_s(par[u], h[u]-h[lca], i); up_t(u, h[u]-h[lca]+1, i);
            up_s(v, h[v]-h[lca]+1, i); up_t(par[v], h[v]-h[lca], i);
        }
    }


    tmp = 1;
    
    for (int i=1; i<=n; i++) {
        if (seen[i]) continue;

        DFS2(i);

        if (!tmp) break;
    }

    cout << (tmp? "Yes\n" : "No\n");


    fill_n(seen, flag+7, 0);  fill_n(ind_s, flag+7, 0); fill_n(ind_t, flag+7, 0);  fill_n(par, flag+7, 0); 
    for (int i=1; i<=flag+7; i++) adj[i].clear(), G[i].clear(); flag = 0;
}


int32_t main() {
    #ifdef LOCAL
    freopen("inp.in", "r", stdin);
    freopen("res.out", "w", stdout);
    #else
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    #endif

    cin >> t;

    while (t--) solve();

    return 0;
}

Compilation message (stderr)

jail.cpp: In function 'void solve()':
jail.cpp:154:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  154 |     for (int i=1; i<=flag+7; i++) adj[i].clear(), G[i].clear(); flag = 0;
      |     ^~~
jail.cpp:154:65: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
  154 |     for (int i=1; i<=flag+7; i++) adj[i].clear(), G[i].clear(); flag = 0;
      |                                                                 ^~~~

• 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