제출 #595966

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
595966		wiwiho	열쇠 (IOI21_keys)	C++17	0 / 100	1 ms	212 KiB

keys

#include <bits/stdc++.h>
#include <bits/extc++.h>

#define StarBurstStream ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
#define iter(a) a.begin(), a.end()
#define riter(a) a.rbegin(), a.rend()
#define lsort(a) sort(iter(a))
#define gsort(a) sort(riter(a))
#define pb(a) push_back(a)
#define eb(a) emplace_back(a)
#define pf(a) push_front(a)
#define ef(a) emplace_front(a)
#define pob pop_back()
#define pof pop_front()
#define mp(a, b) make_pair(a, b)
#define F first
#define S second
#define mt make_tuple
#define gt(t, i) get<i>(t)
#define tomax(a, b) ((a) = max((a), (b)))
#define tomin(a, b) ((a) = min((a), (b)))
#define topos(a) ((a) = (((a) % MOD + MOD) % MOD))
#define uni(a) a.resize(unique(iter(a)) - a.begin())
#define printv(a, b) {bool pvaspace=false; \
for(auto pva : a){ \
    if(pvaspace) b << " "; pvaspace=true;\
    b << pva;\
}\
b << "\n";}

using namespace std;
using namespace __gnu_pbds;

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;

using pii = pair<int, int>;
using pll = pair<ll, ll>;
using pdd = pair<ld, ld>;
using tiii = tuple<int, int, int>;

const ll MOD = 1000000007;
const ll MAX = 2147483647;

template<typename A, typename B>
ostream& operator<<(ostream& o, pair<A, B> p){
    return o << '(' << p.F << ',' << p.S << ')';
}

ll ifloor(ll a, ll b){
    if(b < 0) a *= -1, b *= -1;
    if(a < 0) return (a - b + 1) / b;
    else return a / b;
}

ll iceil(ll a, ll b){
    if(b < 0) a *= -1, b *= -1;
    if(a > 0) return (a + b - 1) / b;
    else return a / b;
}

int n, m;

vector<set<pii>> g, todo; // color, to
vector<int> dsu, sz;
vector<int> dsu2;
vector<int> f;
vector<set<int>> key;

void init(){
    g.resize(n);
    dsu.resize(n);
    sz.resize(n, 1);
    iota(iter(dsu), 0);
    f.resize(n);
    iota(iter(f), 0);
    key.resize(n);
    todo.resize(n);
    dsu2.resize(n);
    iota(iter(dsu2), 0);
}

int findDSU(int a){
    if(dsu[a] != a) dsu[a] = findDSU(dsu[a]);
    return dsu[a];
}

void unionDSU(int a, int b){
    a = findDSU(a);
    b = findDSU(b);
    if(dsu[a] == dsu[b]) return;

    if(sz[a] < sz[b]) swap(a, b);

    for(int i : key[b]){
        set<pii>::iterator it;
        while(it = g[a].lower_bound(mp(i, -1)), 
                it != g[a].end() && it->F == i){
            todo[a].insert(*it);
            g[a].erase(it);
        }
    }
    for(pii i : todo[b]) todo[a].insert(i);
    for(pii i : g[b]){
        if(key[a].find(i.F) != key[a].end()){
            todo[a].insert(i);
        }
        else{
            g[a].insert(i);
        }
    }

    sz[a] += sz[b];
    dsu[b] = a;
}

int findDSU2(int a){
    if(dsu2[a] != a) dsu2[a] = findDSU2(dsu2[a]);
    return dsu2[a];
}

void unionDSU2(int a, int b){
    //cerr << "unionDSU2 " << a << " " << b << "\n";
    a = findDSU2(a);
    b = findDSU2(b);
    dsu2[b] = a;
}

vector<int> find_reachable(vector<int> r, vector<int> u, vector<int> v, vector<int> c){

    n = r.size();
    m = u.size();

    init();

    for(int i = 0; i < m; i++){
        if(c[i] == r[u[i]]) todo[u[i]].insert(mp(c[i], v[i]));
        else g[u[i]].insert(mp(c[i], v[i]));
        if(c[i] == r[v[i]]) todo[v[i]].insert(mp(c[i], u[i]));
        else g[v[i]].insert(mp(c[i], u[i]));
    }

    for(int i = 0; i < n; i++){
        key[i].insert(r[i]);
        if(!todo[i].empty()) f[i] = todo[i].begin()->S;
    }

    //cerr << "test\n";
    //printv(f, cerr);

    vector<bool> vst(n);
    auto findcycle = [&](int s){
        //cerr << "findcycle " << s << "\n";
        vector<int> path;
        while(!vst[s]){
            vst[s] = true;
            //cerr << "visit " << s << "\n";
            path.eb(s);
            s = f[s];
        }
        //cerr << "to " << s << "\n";
        //printv(path, cerr);
        bool ok = false;
        for(int i : path){
            unionDSU2(i, s);
            if(i == s) ok = true;
        }
        if(ok) while(path.back() != s){
            unionDSU(path.back(), s);
            path.pob;
        }
        //cerr << "DSU2 ";
        //for(int i = 0; i < n; i++) cerr << findDSU2(i) << " ";
        //cerr << "\n";
    };
    for(int i = 0; i < n; i++){
        if(!vst[i]) findcycle(i);
    }

    /*cerr << "DSU2 ";
    for(int i = 0; i < n; i++) cerr << findDSU2(i) << " ";
    cerr << "\n";*/

    auto solve = [&](int rt){
        //cerr << "solve " << rt << " : ";
        rt = findDSU(rt);
        //printv(todo[rt], cerr);
        for(pii i : todo[rt]){
            int to = findDSU(i.S);
            //cerr << "go " << i << " " << to << "\n";
            if(findDSU2(rt) != findDSU2(to)){
                //cerr << "change " << rt << " " << to << " " << findDSU2(rt) << " " << findDSU2(to) << "\n";
                f[rt] = to;
                unionDSU2(rt, to);
                break;
            }
            while(to != rt){
                //cerr << "merge " << to << "\n";
                unionDSU(to, rt);
                to = findDSU(f[to]);
            }
        }
    };
    for(int i = 0; i < n; i++){
        if(findDSU(i) != i) continue;
        if(findDSU(f[i]) == i) solve(i);
    }

    vector<int> cnt(n);
    for(int i = 0; i < n; i++){
        cnt[findDSU(i)]++;
    }
    int mn = MAX;
    for(int i = 0; i < n; i++){
        if(findDSU(i) == i && findDSU(f[i]) == i) mn = min(mn, cnt[i]);
    }
    //cerr << mn << "\n";

    /*cerr << "DSU ";
    for(int i = 0; i < n; i++) cerr << findDSU(i) << " ";
    cerr << "\n";
    cerr << "f ";
    printv(f, cerr);
    for(int i = 0; i < n; i++) cerr << findDSU(f[i]) << " ";
    cerr << "\n";
    printv(cnt, cerr);*/

    vector<int> ans(n);
    for(int i = 0; i < n; i++){
        if(cnt[findDSU(i)] == mn) ans[i] = 1;
    }

	return ans;
}

• Subtask 1: 0 / 9
• Subtask 2: 0 / 11
• Subtask 3: 0 / 17
• Subtask 4: 0 / 30
• Subtask 5: 0 / 33