Submission #382418

#	Time	Username	Problem	Language	Result	Execution time	Memory
382418		mehrdad_sohrabi	Parachute rings (IOI12_rings)	C++14	100 / 100	1406 ms	127076 KiB

rings

#include <bits/stdc++.h>
/// 500 485 462 A4
using namespace std;
typedef int ll;
typedef complex<double> point;
typedef long double ld;
#define pb push_back
#define pii pair < ll , ll >
#define F first
#define S second
//#define endl '\n'
//#define int long long
#define sync ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0)
#pragma GCC optimize("Ofast,no-stack-protector,unroll-loops,fast-math")
#define kill(x) return cout<<x<<'\n', 0;
#define inbuf_len 1 << 16
#define outbuf_len 1 << 16
const int MAXN=1e6+100;
map <pii,int> mp;
vector <int> g[MAXN];
ll vis[MAXN];
vector <int> dig;
ll td=0;
ll p1=1;
ll ans=MAXN;
ll t4=0;
ll hazf[MAXN];
ll tool=0;
ll n;
ll ch[MAXN];
ll cnt=0;
vector <int> W;
ll par[MAXN];
ll dor[MAXN];
void del(ll v){
    for (int i=0;i<n;i++){
        vector <int> a;
        for (auto u : g[i]) if (u!=v) a.pb(u);
        g[i]=a;
    }
    g[v].clear();
    hazf[v]=1;
}
void Init(ll N){
    n=N;
    ans=n;
    for (int i=0;i<N;i++){
        par[i]=i;
    }
}
ll getpar(ll v){
    if (par[v]==v) return v;
    return par[v]=getpar(par[v]);
}
void rebuild(){
    for (int i=0;i<MAXN;i++){
        par[i]=i;
    }
    ans=1;
    for (int i=0;i<n;i++) if (g[i].size()>2) p1=0;
    for (int v=0;v<n;v++){
        for (auto u : g[v]){
            if (u>v){
                ll u1=getpar(u);
                ll v1=getpar(v);
                if (u1==v1){
                    p1=0;
                }
                par[u1]=v1;
            }
        }
    }
}
ll pa[MAXN];
ll hi[MAXN];
ll mark[MAXN];
ll dd(ll v,ll p){
    mark[v]=1;
    if (dor[v]==1) return v;
    for (auto u : g[v]){
        if (u==p || mark[v]) continue;
        return dd(u,v);
    }
    return -1;
}
void dfs(ll v,ll p){
    vis[v]=1;
    hi[v]=hi[p]+1;
    pa[v]=p;
    for (auto u : g[v]){
        if (u==p) continue;
        if (vis[u]==1 && hi[u]>hi[v]){
            ll z=u;
            while(z!=v){
                ch[z]++;
                tool++;
                dor[z]=1;
                if (ch[z]==cnt) ans++,W.pb(z);
                z=pa[z];
            }
            tool++;
            dor[v]=1;
            ch[v]++;
            if (ch[v]==cnt) ans++,W.pb(v);
            continue;
        }
        if (vis[u]) continue;
        dfs(u,v);
    }
}
void Link(int A, int B) {
    if (p1==0 || ans==0) return ;
    if (hazf[A] || hazf[B]) return ;
    g[A].pb(B);
    g[B].pb(A);

    if (g[B].size()==3){
    //    cout << "NR " << B << endl;
        cnt++;
        ans=0;
        W.clear();
        for (auto u : g[B]){
            ch[u]++;
            mp[{u,B}]=1;
            mp[{B,u}]=1;
            if (ch[u]==cnt) {
                ans++;
                W.pb(u);
       //         cout << u << " RAS " << endl;
            }
        }
        ch[B]++;
       // cout << ch[B] << " ascw" << endl;
        if (ch[B]==cnt) W.pb(B),ans++;
    }
    if (g[A].size()==3){
    //    cout << " iurfrg " << endl;
        cnt++;
        ans=0;
        W.clear();
        for (auto u : g[A]){
            mp[{u,A}]=1;
            mp[{A,u}]=1;
            ch[u]++;
            if (ch[u]==cnt) {
                ans++;
                W.pb(u);
            }
        }
        ch[A]++;
        if (ch[A]==cnt) W.pb(A),ans++;
    }
    if (t4==1){
        if (getpar(A)==getpar(B)) p1=0;
    }
    if (p1==0) return ;
//        cout << "GOOOZ" << endl;
    if (t4==1 && (g[A].size()>2 || g[B].size()>2)){
        p1=0;
        return ;
    }
    if (g[A].size()>3){
            t4=1;
        del(A);
        rebuild();
        return ;
    }
    if (g[B].size()>3){
        t4=1;
        del(B);
        rebuild();
        return ;
    }
    if (getpar(A)==getpar(B)){
     //  cout << "GOOZ" << endl;
        if (td==0){
            td++;
            ans=0;
            W.clear();
            cnt++;
            for (int i=0;i<n;i++){
                if (vis[i]==0) dfs(i,i);
            }
        }

        else {
            ll z=dd(A,B);
            ll tz=dd(B,A);

            if (mp.count({z,tz})){
                cnt++;
                W.clear();
                ans=0;
                ch[z]++;
                if (ch[z]==cnt) ans++;
                ch[tz]++;
                if (ch[tz]==cnt) ans++;
          //      cout << ans << " erij " << endl;
            }
            else p1=0;
        }

    }
    else{
        par[par[A]]=par[B];
    }

}

int CountCritical() {
    /*
    memset(vis,0,sizeof vis);
    for (int i=0;i<n;i++){
        if (vis[i]==0) dfs(i,i);
    }
    */
    if (t4) {
        return p1;
    }
    if (p1==0) return 0;
    return ans;
}
/*

int main() {
  int tmp;

  char *inbuf, *outbuf;
  inbuf = (char*) malloc(inbuf_len * sizeof(char));
  outbuf = (char*) malloc(outbuf_len * sizeof(char));
  tmp = setvbuf(stdin, inbuf, _IOFBF, inbuf_len);
  tmp = setvbuf(stdout, outbuf, _IOFBF, outbuf_len);

  int N, L;
  tmp = scanf("%d %d", &N, &L);
  assert(tmp == 2);
  Init(N);

  int i;
  for (i = 0; i < L; i++) {
    int A, B;
    tmp = scanf("%d", &A);
    if (A == -1) {
      int critical;
      critical = CountCritical();
      printf("%d ans\n", critical);
    } else {
      tmp = scanf("%d", &B);
      assert(tmp == 1);
      Link(A, B);
    }
  }

  return 0;

}
*/

• Subtask 1: 20 / 20
• Subtask 2: 17 / 17
• Subtask 3: 18 / 18
• Subtask 4: 14 / 14
• Subtask 5: 31 / 31