제출 #968802

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
968802		angella	조이터에서 친구를 만드는건 재밌어 (JOI20_joitter2)	C++17	0 / 100	18 ms	57948 KiB

joitter2

/*
    IN THE NAME OF GOD
*/
#include <bits/stdc++.h>

// #pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
// #pragma GCC optimize("O3")
// #pragma GCC optimize("unroll-loops")

using namespace std;

typedef long long ll;
typedef pair<ll, ll> pll;
typedef pair<int, int> pii;
typedef long double ld;

#define F                                      first
#define S                                      second
#define Mp                                     make_pair
#define pb                                     push_back
#define pf                                     push_front
#define size(x)                                ((ll)x.size())
#define all(x)                                 (x).begin(),(x).end()
#define kill(x)		                           cout << x << '\n', exit(0);
#define fuck(x)                                cout << "(" << #x << " , " << x << ")" << endl
#define endl                                   '\n'

const int N = 3e5+23, lg = 18;
ll Mod = 1e9+7; //998244353;

inline ll MOD(ll a, ll mod=Mod) {a%=mod; (a<0)&&(a+=mod); return a;}
inline ll poww(ll a, ll b, ll mod=Mod) {
    ll ans = 1;
    a=MOD(a, mod);
    while (b) {
        if (b & 1) ans = MOD(ans*a, mod);
        b >>= 1;
        a = MOD(a*a, mod);
    }
    return ans;
}

ll n, m, ans, sz[N], par[N];
set<pii> st[N], str[N];
set<int> eout[N], ein[N];

int getPar(int v) {return (par[v]==0 ? v : par[v]=getPar(par[v]));}

void merge(int v, int u) {
    if(sz[v] < sz[u]) swap(v,u);
    ans += (2ll*sz[v]*sz[u]);
    par[u] = v;
    for(auto it : st[u]) st[v].insert(it);
    for(auto it : str[u]) str[v].insert(it);
    ll tmp = 0, tmp2 = size(ein[v]);
    for(auto it : ein[u]) {
        int tt = getPar(it);
        st[tt].erase({it, u});
        str[tt].erase({u, it});
        st[tt].insert({it, v});
        str[tt].insert({v, it});
        eout[tt].erase(u);
        eout[tt].insert(v);
        if(ein[v].find(it) != ein[v].end()) tmp++;
        else {
            ein[v].insert(it);
            ans += sz[v];
        }
    }
    //fuck(ans);
    ans += ((tmp2 - tmp) * sz[u]);
    sz[v] += sz[u];
}

int main () {
	ios_base::sync_with_stdio(false), cin.tie(0);

	cin>>n>>m;
    fill(sz+1, sz+n+1, 1);
    for(int v,u,i=1; i<=m; i++) {
        cin>>v>>u;
        if(getPar(v)!=getPar(u)) {
            int pv=getPar(v), pu=getPar(u);
            if(eout[pu].find(pv) != eout[pu].end()) {
                while(true) {
                    auto it = str[pu].lower_bound({pv, 0});
                    if(it==str[pu].end()||(*it).F!=pv) break;
                    ein[pv].erase((*it).S);
                    ans -= sz[pv];
                    st[pu].erase({(*it).S, (*it).F});
                    str[pu].erase((*it));
                }
                eout[pu].erase(pv);
                merge(pu, pv);
            } else {
                eout[pv].insert(pu);
                if(st[pv].find({v, pu}) == st[pv].end()) {
                    ein[pu].insert(v);
                    st[pv].insert({v, pu});
                    str[pv].insert({pu, v});
                    ans += sz[pu];
                }
            }
        }
        cout<<ans<<endl;
        // if(i == 8) {
        //     for(int j=1; j<=n; j++) fuck(getPar(j));
        // }
    }

	return 0;
}

• Subtask 1: 0 / 1
• Subtask 2: 0 / 16
• Subtask 3: 0 / 83