Submission #1260964

#	Time	Username	Problem	Language	Result	Execution time	Memory
1260964		raymoo_	Railway (BOI17_railway)	C++17	0 / 100	140 ms	58176 KiB

railway

#include<bits/stdc++.h>
using namespace std; 
#define fi first
#define se second
#define pb push_back
#define eb emplace_back
#define umap unordered_map
#define prq priority_queue
#define vect vector
#define rs resize
#define bend(v) v.begin(),v.end()
#define pob pop_back
#define pof pop_front
#define lwb lower_bound
#define upb upper_bound
#define pii pair<int,int>
#define nextl cout << '\n'
#define el '\n'
#define deb cout<<"\nok\n";return 
#define ll long long
#define int long long
#define dbl long double
#define popcnt __builtin_popcount
#define ctz __builtin_ctz
#define FILE "ellencute"
 
const ll INF=902337203695775807, N=2e5+69, MOD=1e9+7;    
 
void ffopen(){
    if(fopen(FILE".inp", "r")){
        freopen(FILE".inp", "r", stdin);
        freopen(FILE".out", "w", stdout);
    }else if(fopen("ellencute.inp", "r")){
        freopen("ellencute.inp", "r", stdin);
        freopen("ellencute.out", "w", stdout);
    }
}

int pm(int a,const int b=1e9+7){return ((a%b)+b)%b;}
int sq(int x){return x*x;}
ll __lcm(ll a, ll b, const ll lim=LLONG_MAX){
    if(a == -1 || b == -1)return -1;
    ll g = __gcd(a,b);
    if(b/g > lim/a)return -1;
    return (a/g)*b;
}

vect<int> G[N];
int up[N][19], pt[N], t[N], n, mt = 0, add[N], visited[N], D[N], sz[N];

void DFS(int u){
    visited[u] = 1;
    t[++mt] = u;
    pt[u] = mt;

    for(int v : G[u]) if(!visited[v]){
        D[v] = D[u]+1;
        up[v][0] = u;
        DFS(v);
        sz[u] += sz[v];
    }

    sz[u]++;
}

void prep(){
    up[1][0] = 1;
    for(int b=1;19>b;b++){
        for(int i=1;n>=i;i++){
            up[i][b] = up[up[i][b-1]][b-1];
        }
    }
}

int lca(int u, int v){
    if(D[u] < D[v])swap(u, v);

    int diff= D[u] - D[v], M = -1, tu = u;
    for(int b=19;b>=0;b--)if((1<<b) <=diff){
        u = up[u][b];
        diff -= (1<<b);
    }

    if(u==v)return u;

    for(int b=18;b>=0;b--) if(up[u][b] != up[v][b]){
        u = up[u][b];
        v = up[v][b];
    }   

    return up[u][0];
}

int bit[N];

void upd(int x, int v){
    for(;x<N;x+=x&-x) bit[x] += v;
}

int get(int x){
    int res=0;
    for(;x>0;x-=x&-x)res += bit[x];
    return res;
}

int cr(int l, int r){
    return get(r) - get(l-1);
}

map<pii, int> mp;

void dfs(int u){
    visited[u] = 1;
    for(int v : G[u])if(!visited[v]){
        dfs(v);
        add[u] += add[v];
        mp[{u, v}] = mp[{v, u}] = add[v];
    }
}


void sol(){
    int q, k;
    cin >> n >> q >> k;

    vect<pii> edges;

    for(int i=1;n>i;i++){
        int u, v;
        cin >> u >> v;
        G[u].eb(v);
        G[v].eb(u);
        edges.eb(u, v);
    }

    // deb;

    DFS(1);
    prep();

    // deb;

    while(q--){
        int m;cin >> m;
        int b[m];
        for(int& i : b){
            cin >> i;
            upd(pt[i], 1);
        }
        int L = b[0];
        cout << m << el;
        for(int i : b){
            L = lca(L, i);
            int child = cr(pt[i], pt[i]+sz[i]-1);

            child--;

            if(!child) add[i]++;//, cout << i << el;
            else add[i] -= child-1;
        }

        if(L != 1) add[L]--;

        for(int& i : b){
            upd(pt[i], -1);
        }
    }

    memset(visited, 0, sizeof visited);
    dfs(1);

    // deb;

    for(int i=0;n-1>i;i++){
        auto [u, v] = edges[i];
        // if(mp[{u, v}] >= k)cout << i << ' ' << mp[{u,v}] << el;
        // cout << i+1 << ' ' << mp[{u,v}] << el;
        if(mp[{u,v}] >= 2)cout << i+1 << ' ';
    }
}

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    ffopen();
    int t=1;
    //cin >> t;
    while(t--)sol();
}
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Compilation message (stderr)

railway.cpp: In function 'void ffopen()':
railway.cpp:31:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |         freopen(FILE".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
railway.cpp:32:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |         freopen(FILE".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
railway.cpp:34:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   34 |         freopen("ellencute.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
railway.cpp:35:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 |         freopen("ellencute.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 8
• Subtask 2: 0 / 15
• Subtask 3: 0 / 7
• Subtask 4: 0 / 29
• Subtask 5: 0 / 16
• Subtask 6: 0 / 25