Submission #1200117

#	Time	Username	Problem	Language	Result	Execution time	Memory
1200117		InvMOD	Werewolf (IOI18_werewolf)	C++20	0 / 100	451 ms	115080 KiB

werewolf

#include<bits/stdc++.h>

using namespace std;

#define fi first
#define se second
#define pb push_back
#define eb emplace_back

#define vi vector<int>
#define pi pair<int,int>
#define sz(v) (int)(v).size()
#define all(v) (v).begin(), (v).end()
#define compact(v) (v).erase(unique(all(v)), (v).end())

template<class T> using upq = priority_queue<T, vector<T>, greater<T>>;
template<class T> int lwrbound(const vector<T>& a, const T& b, const int s = 0){return int(lower_bound(s + all(a), b) - a.begin());}
template<class T> int uprbound(const vector<T>& a, const T& b, const int s = 0){return int(upper_bound(s + all(a), b) - a.begin());}

#define FOR(i, a, b) for(int i = (a); i <= (b); i++)
#define ROF(i, a, b) for(int i = (a); i >= (b); i--)
#define sumof(x) accumulate(all(x), 0ll)
#define dbg(x) "[" << #x " = " << (x) << "]"
#define el "\n"

using ll = long long;
using ld = long double;

template<class T> bool ckmx(T& a, const T b){return (a < b ? a = b, true : false);}
template<class T> bool ckmn(T& a, const T b){return (a > b ? a = b, true : false);}

const int N = 2e5 + 5;

int n, m, q, dsu[N], tin[N], tout[N], timerDFS;

vector<int> Edge[N], tree[N]; set<int> sub[N]; vector<int> Q[N];

int asc(int x){
    return dsu[x] == x ? x : dsu[x] = asc(dsu[x]);
}

bool inSub(int u, int v){
    return tin[u] <= tin[v] && tout[v] <= tout[u];
}

void unite(int u, int v){
    u = asc(u), v = asc(v); // u is par

    if(u != v){
        // merge st v -> u
        dsu[v] = u;
        if(sz(sub[u]) < sz(sub[v]))
            swap(sub[u], sub[v]);

        for(int x : sub[v]) sub[u].insert(x);

    }
}

void dfs1(int x, int p){
    tin[x] = ++timerDFS;
    for(int v : tree[x])if(v != p){
        dfs1(v, x);
    }
    tout[x] = ++timerDFS;
}

vector<int> check_validity(int _n, vector<int> X, vector<int> Y,
                           vector<int> S, vector<int> E, vector<int> L, vector<int> R){

    n = _n, m = sz(X), q = sz(E);

    FOR(i, 0, m - 1) Edge[X[i]].eb(Y[i]), Edge[Y[i]].eb(X[i]);

    FOR(i, 0, n - 1) dsu[i] = i;

    FOR(x, 0, n - 1){
        for(int v : Edge[x]){
            if(v >= x) continue;

            auto join = [&](int u, int v) -> void{ // u > v
                u = asc(u), v = asc(v);
                if(u != v){
                    dsu[v] = u;
                    tree[u].eb(v);
                }
            };

            join(x, v);
        }
    }
    dfs1(n - 1, -1);

    FOR(i, 0, n - 1){
        dsu[i] = i;
        sub[i].insert(tin[i]);
    }

    vector<int> ans(q);
    FOR(i, 0, q - 1) Q[L[i]].eb(i);

    ROF(x, n - 1, 0){
        for(int v : Edge[x]){
            if(v <= x) continue;

            unite(x, v);
        }

        for(int id : Q[x]){
            //cout << id <<" " << R[id] <<" " << E[id] << el;
            if(!inSub(R[id], E[id])){
                ans[id] = 0;
            }
            else{ //cout << id << el;
                if(sub[x].find(tin[S[id]]) != sub[x].end()){
                    auto it = sub[x].upper_bound(tin[R[id]]);

                    if(it != sub[x].end() && *it < tout[R[id]]){
                        ans[id] = 1;
                    }
                    else ans[id] = 0;
                }
                else{
                    ans[id] = 0;
                }
            }
        }
    }
    return ans;
}

//#define name "InvMOD"
#ifdef name
signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    if(fopen(name".INP", "r")){
        freopen(name".INP","r",stdin);
        freopen(name".OUT","w",stdout);
    }

    int n,m,q; cin >> n >> m >> q;

    vector<vector<int>> E(2, vector<int>(m));
    FOR(i, 0, 1){
        FOR(j, 0, m - 1){
            cin >> E[i][j];
        }
    }

    vector<vector<int>> Q(4, vector<int>(q));
    FOR(i, 0, 3){
        FOR(j, 0, q - 1){
            cin >> Q[i][j];
        }
    }

    vector<int> answer = check_validity(n, E[0], E[1], Q[0], Q[1], Q[2], Q[3]);

    for(int v : answer) cout << v <<" "; cout <<"\n";
    return 0;
}
#endif // name

• Subtask 1: 0 / 7
• Subtask 2: 0 / 8
• Subtask 3: 0 / 34
• Subtask 4: 0 / 51