Submission #490211

#	Time	Username	Problem	Language	Result	Execution time	Memory
490211		fcmalkcin	Split the Attractions (IOI19_split)	C++17	0 / 100	6 ms	10444 KiB

split

#pragma GCC optimize("Ofast")
#pragma GCC optimization("unroll-loops, no-stack-protector")
#pragma GCC target("avx,avx2,fma")

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

#define ll  int
#define pll pair<ll,ll>
#define ff first
#define ss second
#define pb push_back
#define endl "\n"
mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());

const ll maxn=2e5+50;
const ll mod=1e9+7  ;
const ll base=2e18;
/// you will be the best but now you just are trash
/// goal 6/7
vector<ll> adj[maxn];
vector<pll> nw;
vector<ll> adj1[maxn];
ll siz[maxn];
ll low[maxn];
ll num[maxn];
ll cntnw=0;
ll pos=-1;
ll anc[maxn];
void dfs(ll u)
{
    cntnw++;
    low[u]=cntnw;
    num[u]=cntnw;
    siz[u]=1;
    bool chk=true;
    for (auto to:adj[u])
    {
        if (num[to])
        {
            low[u]=min(low[u],num[to]);
            continue;
        }
        adj1[u].pb(to);
        adj1[to].pb(u);
        anc[to]=u;
     //   cout <<u<<" "<<to<<" chk1"<<endl;
        dfs(to);
        low[u]=min(low[u],low[to]);
        siz[u]+=siz[to];
        if (siz[to]<=nw[0].ff)
        {

        }
        else
        {
            chk=false;
        }
    }
    if (chk&&siz[u]>=nw[0].ff)
    {
        pos=u;
    }
}
vector<ll> ans;
ll colmx;
ll cnt[4];
ll val[4];
void dfs1(ll u,ll col1)
{
    if (cnt[col1]<val[col1])
    {

    }
    else
    {
        col1=colmx;
    }
    ans[u]=col1;
    cnt[col1]++;
    assert(cnt[col1]<=val[col1]);
    for (auto to:adj1[u])
    {
        if (to==anc[u]||ans[to]) continue;
        dfs1(to,col1);
    }
}
void dfs2(ll u,ll col2)
{
    if (cnt[col2]<val[col2])
    {

    }
    else
    {
        col2=colmx;
    }
    ans[u]=col2;
    cnt[col2]++;
    assert(cnt[col2]<=val[col2]);
    for (auto to:adj1[u])
    {
        if (ans[to]) continue;
        dfs2(to,col2);
    }
}
vector<ll> find_split(int n, int a, int b, int c, vector<ll> p, vector<ll> q)
{
    memset(anc,-1,sizeof(anc));
    nw.pb(make_pair(a,1));
    nw.pb(make_pair(b,2));
    nw.pb(make_pair(c,3));
    sort(nw.begin(),nw.end());
    for (int i=1;i<=nw.size();i++) val[nw[i-1].ss]=nw[i-1].ff;
    colmx=nw.back().ss;
    for (int i=0;i<p.size();i++)
    {
        adj[p[i]].pb(q[i]);
        adj[q[i]].pb(p[i]);
    }
    ans=vector<ll> (n,0);
    dfs(0);
    cout <<pos<<endl;
    assert(pos!=-1);
    ll cl=siz[pos];
    ll u=pos;
    ll h=n-cl;
    for (int i=0;i<adj1[u].size();i++)
    {
        ll to=adj1[u][i];
        if (to==anc[u]) continue;
        if (low[to]<num[u])
        {
            if (cl-siz[to]>=nw[0].ff)
            {
                h+=siz[to];
                cl-=siz[to];
                dfs1(to,nw[1].ss);
            }
            else
            {
              //  cout <<"nah"<<endl;
                dfs1(u,nw[0].ss);
                break;
            }
        }
        else
        {
            dfs1(to,nw[0].ss);
        }
    }
   // cout <<h<<endl;
    if (h<nw[1].ss)
    {
        ans=vector<ll> (n,0);
        return ans;
    }
    if (anc[u]!=-1)
    {
        dfs2(anc[u],nw[1].ss);
    }
    for (int i=1;i<=3;i++)
    {
        assert(cnt[i]==val[i]);
    }
    return ans;
}


/*int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    if (fopen("t.inp", "r"))
    {
        freopen("test.inp", "r", stdin);
        freopen("test.out", "w", stdout);
    }
    vector<ll> ans=find_split(9, 4, 2, 3, {0, 0, 0, 0, 0, 0, 1, 3, 4, 5},{1, 2, 3, 4, 6, 8, 7, 7, 5, 6});
    for (auto to:ans) cout <<to<<" ";
    cout <<endl;
}*/

Compilation message (stderr)

split.cpp:2: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    2 | #pragma GCC optimization("unroll-loops, no-stack-protector")
      | 
split.cpp:18:15: warning: overflow in conversion from 'double' to 'int' changes value from '2.0e+18' to '2147483647' [-Woverflow]
   18 | const ll base=2e18;
      |               ^~~~
split.cpp: In function 'std::vector<int> find_split(int, int, int, int, std::vector<int>, std::vector<int>)':
split.cpp:114:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  114 |     for (int i=1;i<=nw.size();i++) val[nw[i-1].ss]=nw[i-1].ff;
      |                  ~^~~~~~~~~~~
split.cpp:116:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  116 |     for (int i=0;i<p.size();i++)
      |                  ~^~~~~~~~~
split.cpp:128:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  128 |     for (int i=0;i<adj1[u].size();i++)
      |                  ~^~~~~~~~~~~~~~~

• Subtask 1: 0 / 7
• Subtask 2: 0 / 11
• Subtask 3: 0 / 22
• Subtask 4: 0 / 24
• Subtask 5: 0 / 36