Submission #890160

#	Time	Username	Problem	Language	Result	Execution time	Memory
890160		LeVanThuc	Bitaro’s Party (JOI18_bitaro)	C++17	0 / 100	2060 ms	16476 KiB

bitaro

#include<bits/stdc++.h>
using namespace std;
#define ll int
#define fi first
#define se second
#define p(x,y) pair<ll,ll>(x,y)
#define BIT(i,x) ((x>>i)&1)
#define MASK(x) (1<<x)
#define ld long double
#define __builtin_popcount __builtin_popcountll
#define pll pair<ll,ll>
template<class T1,class T2>
bool maximize(T1 &x,T2 y)
{
    if(x<y)
    {
        x=y;
        return 1;
    }
    return 0;
}
template<class T1,class T2>
bool minimize(T1 &x,T2 y)
{
    if(y<x)
    {
        x=y;
        return 1;
    }
    return 0;
}
const ll M=1e9+7;
template <class T1,class T2>
void add(T1 &x,T2 y)
{
    x+=y;
    if(x>=M) x-=M;
}
template <class T1,class T2>
void sub(T1 &x, T2 y)
{
    x-=y;
    if(x<0) x+=M;
}
void online()
{
    std::ios_base::sync_with_stdio(0);
    cin.tie(0);
#ifdef thuc
    freopen("input.inp","r",stdin);
    freopen("output.out","w",stdout);
#else
#endif // thuc
}
const ll N=2e5+10;
ll vs[N],f[N],ban[N],n,m,q,src;
vector<ll> gr[N],rgr[N];
ll solve1(ll u)
{
    if(vs[u]) return f[u];
    vs[u]=1;
    f[u]=-1e9;
    if(u==src) return f[u]=0;
    for(auto v:gr[u])
    {
        maximize(f[u],solve1(v)+1);
        maximize(f[u],solve1(v)+1);
    }
    return f[u];
}
ll tr(ll u,ll y)
{
    src=u;
    for(int i=1;i<=n;i++)
    {
        vs[i]=0;
    }
    vector<ll> vt;
    for(int i=1;i<=y;i++)
    {
        ll x;
        cin>>x;
        ban[x]=1;
        vt.push_back(x);
    }
    ll ans=-1;
    for(int i=1;i<=n;i++)
    {
        if(!ban[i])maximize(ans,solve1(i));
    }
    for(auto v:vt) ban[v]=0;
    return ans;
}
bool sub2()
{
 
    ll t,y;
    cin>>t>>y;
    cout<<tr(t,y);
    return 0;
}
vector<pll> bt[N];
void dfs(ll u,ll d,ll src)
{
    if(bt[u].size()<200)
    {
        bt[u].push_back(p(d,src));
        ll i=bt[u].size()-1;
        while(i>0&&bt[u][i].fi>bt[u][i-1].fi) swap(bt[u][i],bt[u][i-1]),i--;
    }
    for(auto v:gr[u])
    {
        dfs(v,d+1,src);
    }
 
}
void calc()
{
    for(int i=1;i<=n;i++)
    {
        dfs(i,0,i);
    }
}
ll tr2(ll u,ll y)
{
    vector<ll> vt;
    for(int i=1;i<=y;i++)
    {
        ll x;
        cin>>x;
        vt.push_back(x);
        ban[x]=1;
    }
    ll ans=-1;
    for(int i=0;i<bt[u].size();i++)
    {
        if(!ban[bt[u][i].se]) maximize(ans,bt[u][i].fi);
    }
    for(auto v:vt) ban[v]=0;
    return ans;
}
bool sub3()
{
    for(int i=1;i<=n;i++)
    {
        dfs(i,0,i);
    }
    for(int i=1;i<=q;i++)
    {
        ll t,y;
        cin>>t>>y;
        if(y>=200)
        {
            cout<<tr(t,y)<<'\n';
        }
        else cout<<tr2(t,y)<<'\n';
    }
    return 0;
}
int main()
{
    online();
    cin>>n>>m>>q;
    for(int i=1;i<=m;i++)
    {
        ll u,v;
        cin>>u>>v;
        if(u>v) swap(u,v);
        gr[u].push_back(v);
    }
    return sub3();
}

Compilation message (stderr)

bitaro.cpp: In function 'int tr2(int, int)':
bitaro.cpp:135:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  135 |     for(int i=0;i<bt[u].size();i++)
      |                 ~^~~~~~~~~~~~~

• Subtask 1: 0 / 7
• Subtask 2: 0 / 7
• Subtask 3: 0 / 86