Submission #64329777

Source Code Expand

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using ll=long long;
using ul=unsigned long;
using ld=long double;
using bl=bool;
using st=string;
using mint=atcoder::modint998244353;
using Mint=atcoder::modint1000000007;
#define vl vector<ll>
#define vvl vector<vl>
#define vvvl vector<vvl>
#define vvvvl vector<vvvl>
#define vd vector<ld>
#define vvd vector<vd>
#define vvvd vector<vvd>
#define vvvvd vector<vvvd>
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;

using ll=long long;
using ul=unsigned long;
using ld=long double;
using bl=bool;
using st=string;
using mint=atcoder::modint998244353;
using Mint=atcoder::modint1000000007;

#define vl vector<ll>
#define vvl vector<vl>
#define vvvl vector<vvl>
#define vvvvl vector<vvvl>

#define vd vector<ld>
#define vvd vector<vd>
#define vvvd vector<vvd>
#define vvvvd vector<vvvd>

#define vb vector<bl>
#define vvb vector<vb>
#define vvvb vector<vvb>
#define vvvvb vector<vvvb>

#define vs vector<st>
#define vvs vector<vs>
#define vvvs vector<vvs>

#define vp vector<pair<ll,ll>>
#define vvp vector<vp>
#define vvvp vector<vvp>

#define vm vector<mint>
#define vvm vector<vm>
#define vvvm vector<vvm>

#define vM vector<Mint>
#define vvM vector<vM>
#define vvvM vector<vvM>

#define cmx(n,v) n=n<v?v:n
#define cmn(n,v) n=n>v?v:n

#define all(n) begin(n),end(n)
#define nxp(a) next_permutation(all(a))
#define rev(n) reverse(all(n))
#define sor(n) stable_sort(all(n))

#define rep(i,n) for(ll i=0;i<(n);i++)
#define rep2(i,a,n) for(ll i=a;i<(n);i++)
#define rep3(i,n) for(ll i=n-1;i>=0;i--)

#define sz(n) n.size()

#define lb(vec,src) lower_bound(vec.begin(),vec.end(),src)-vec.begin()
#define ub(vec,src) upper_bound(vec.begin(),vec.end(),src)-vec.begin()
#define lb2(vec,src) *lower_bound(vec.begin(),vec.end(),src)
#define ub2(vec,src) *upper_bound(vec.begin(),vec.end(),src)

#define mn1(a) min_element(all(a))
#define mx1(a) max_element(all(a))
#define mn2(a) *min_element(all(a))
#define mx2(a) *max_element(all(a))

#define uniq(a) {sort(all(a)); (a).erase(unique(all(a)),(a).end());}

#define DET2(x1,y1,x2,y2) (x1)*(y2)-(x2)*(y1)
#define DET3(x1,y1,z1,x2,y2,z2,x3,y3,z3) (x1)*(y2)*(z3)+(x2)*(y3)*(z1)+(x3)*(y1)*(z2)-(z1)*(y2)*(x3)-(z2)*(y3)*(x1)-(z3)*(y1)*(x2)
const ll inf=9e18;

ll calc_digit(ll N) {
    ll res=0;
    while(N>0){
        res++;
        N/=10;
    }
    return res;
}

ll factorial(ll n,ll mod=1e18) {
    ll ans=1;
    for(ll i=n; i>=2;i--) ans=(ans*i)%mod;
    return ans;
}

ll round_up(ll x,ll y) {
    return (x+y-1)/y;
}

ll floor_int(ll x,ll m) {
    ll r=(x%m+m)%m; //負の剰余を正の剰余に置き換える
    return (x-r)/m; //return
}

ll rmd(ll x,ll m) {
    ll r=(x%m+m)%m; //負の剰余を正の剰余に置き換える
    return r;
}

ll rmd_2(ll x,ll m) {
    ll r=(x%m+m)%m; //負の剰余を正の剰余に置き換える
    return (m-r)%m; //return
}

ll bubble_sort(vl a,ll n) {
    ll res=0;
    rep(i,n-1){
        for(ll j=n-1;j>i;j--){
            if(a[j-1]>a[j]){
                swap(a[j-1],a[j]);
                res++;
            }
        }
    }
    return res;
}

ll sum_v(vl a) {
    ll res=0;
    ll n=sz(a);
    rep(i,n) res+=a[i];
    return res;
}

ll stair_sum(ll from,ll to) {
    return (from+to)*(to-from+1)/2;
}

ll Power(ll var,ll p) {
    if(p==1) return var;
    ll ans=Power(var*var,p/2);
    if(p&1) ans*=var;
    return ans;
}

ll cnt_01(ll n,ll now) {
    ll res=0;
    res+=(n/now)*(now/2);
    if(n%now>=now/2) res+=n%now-(now/2)+1;
    return res;
}

ll sum_pop(ll n) {
    ll res=0;
    for(ll b=0;b<60;b++){
        res+=(n/(1ll<<(b+1)))*(1ll<<b);
        res+=max(0ll,n%(1ll<<(b+1))-(1ll<<b)+1);
    }
    return res;
}

ll Tree_Diameter(vvl& g) {
    ll n=sz(g);
    ll start=0;
    ll ans=0;
    for(ll i=0;i<2;i++){
        queue<ll> q;
        q.push(start);
        vl dis(n,inf);
        dis[start]=0;
        while(!q.empty()){
            ll u=q.front();
            q.pop();
            start=u;
            ans=dis[u];
            for(ll v:g[u]){
                if(dis[v]!=inf) continue;
                dis[v]=dis[u]+1;
                q.push(v);
            }
        }
    }
    return ans;
}

ll calc_sum_of_abs_dis(vl a){
    sor(a);
    ll n=sz(a);
    ll res=0;
    rep(i,n) res+=a[i]*(2*i+1-n);
    return res;
}

bool is_prime(ll N) {
    if(N==1) return false;
    if(N==2) return true;
    if(N%2==0) return false;
    for(ll p=3;p*p<=N;p+=2) if(N%p==0) return false;
    return true;
}

bool in_out(ll x,ll h) {
    return 0<=x and x<h;
}

bool dis_solve1(ll x1,ll x2,ll y1,ll y2,ll r) {
    ll xx=(x1-x2),yy=(y1-y2);
    ll dis=xx*xx+yy*yy;
    return (r*r==dis);
}

bool dis_solve2(ll x1,ll x2,ll y1,ll y2,ll d1,ll d2) {
    ll xx=(x1-x2),yy=(y1-y2),r1=(d1+d2),r2=(d1-d2);
    ll dis=xx*xx+yy*yy;
    return (r2*r2<=dis&&dis<=r1*r1);
}

void printl(vl v,ll len=0) {
    ll vsz=min(len,ll(v.size()));
    for(ll i=0;i<vsz;i++){
        cout << v[i] << endl;
    }
}

void prints(vs v) {
    ll vsz=v.size();
    for(ll i=0;i<vsz;i++){
        cout << v[i] << endl;
    }
}

vl p_list(ll n) {
    vl res;
    vb check(n+1);
    for(ll i=2;i<=n;i++){
        if(check[i]) continue;
        res.push_back(i);
        ll ii=i;
        while(ii<=n){
            check[ii]=true;
            ii+=i;
        }
    }
    return res;
}

vl cumulative_sum(vl a) {
    ll s=sz(a);
    vl b(s+1,0);
    for(ll i=0;i<s;i++){
        b[i+1]=a[i]+b[i];
    }
    return b;
}

vl n_num(ll a,ll n) {
    vl res;
    while(a){
        res.push_back(a%n);
        a/=n;
    }
    rev(res);
    return res;
}

vl c_press(vl a) {
    ll n=sz(a);
    vl res=a,c=a;
    sor(c);
    uniq(c);
    rep(i,n) res[i]=lb(c,res[i]);
    return res;
}

vl min_fact(ll n) {
    vl pl;
    vl res(n+1,-1);
    for(ll d=2;d<=n;d++){
        if(res[d]==-1){
            res[d]=d;
            pl.push_back(d);
        }
        for(ll p:pl){
            if(p*d>n||p>res[d]) break;
            res[p*d]=p;
        }
    }
    return res;
}

vvl to_grid(vl &a,ll k) {
    ll n=sz(a);
    ll m=(n+k-1)/k;
    vvl b(k,vl(m,inf));
    rep(i,n) b[i%k][i/k]=a[i];
    return b;
}

vvl rotate_ll(vvl& V2d,ll wise) {
    vvl a=V2d;
    ll h=sz(a),w=sz(a[0]);
    vvl res(w,vl(h));
    if(wise) {rep(i,h)rep(j,w) res[j][h-i-1]=a[i][j];}
    else {rep(i,h)rep(j,w) res[w-j-1][i]=a[i][j];}
    return res;
}

vs rotate_st(vs s,ll wise) {
    vs a=s;
    ll h=sz(a),w=sz(a[0]);
    vs res(w);
    rep(i,w) res[i].append(h,'.');
    if(wise) {rep(i,h)rep(j,w) res[j][h-i-1]=a[i][j];}
    else {rep(i,h)rep(j,w) res[w-j-1][i]=a[i][j];}
    return res;
}

vp prime_factorize(ll N) {
    vp res;
    for (ll a=2;a*a<=N;++a) {
        if (N%a!=0) continue;
        ll ex=0;
        while (N%a==0) {
            ex++;
            N/=a;
        }
        res.push_back({a,ex});
    }
    if (N!=1) res.push_back({N,1});
    return res;
}

template<typename T> void input(T &a) { cin >> a; };
template<typename T1, typename... T2> void input(T1&a, T2 &...b) { cin >> a; input(b...); };

template<typename T=ll>
vector<T> rd(size_t n) {
    vector<T> ts(n);
    for (size_t i=0;i<n;i++) cin >> ts[i];
    return ts;
}

ll di[8]={1,-1,0,0,1,1,-1,-1};
ll dj[8]={0,0,1,-1,1,-1,-1,1};

//abcdefghijklmnopqrstuvwxyz
//std::setprecision(15);
//2^29<10^9

//|\__/|
//(☆θωθ)☆ :Mimamori_Etoigne:

int main() {

	ios::sync_with_stdio(0);
	cin.tie(0);
    
    ll t;
    cin >> t;

    while(t--){

        ll n;
        cin >> n;

        vl a=rd(2*n);
        rep(i,2*n) a[i]--;

        vvl pos(n);
        vb f(n,true);

        rep(i,2*n){
            if(i+1<2*n)if(a[i]==a[i+1]) f[a[i]]=false;
            pos[a[i]].push_back(i);
        }

        set<pair<ll,ll>> ans;
        vl dx={-1,1};

        //0 から n-1
        rep(i,n){
            if(!f[i]) continue;
            rep(d0,2)rep(d1,2){
                ll n0=pos[i][0]+dx[d0];
                ll n1=pos[i][1]+dx[d1];
                if(!in_out(n0,2*n)) continue;
                if(!in_out(n1,2*n)) continue;
                if(n0==n1) continue;
                if(a[n0]==a[n1]&&f[a[n0]]){
                    ll x=i,y=a[n0];
                    if(x>y) swap(x,y);
                    ans.insert({x,y});
                }
            }
        }

        cout << sz(ans) << endl;

    }

}

Submission Info

Judge Result