Submission #459256

#	Time	Username	Problem	Language	Result	Execution time	Memory
459256		MOUF_MAHMALAT	KOVANICE (COI15_kovanice)	C++11	50 / 100	215 ms	22948 KiB

kovanice

#include<bits/stdc++.h>
#define all(s) s.begin(),s.end()
using namespace std;
typedef int ll;
ll n,m,k,a[300009],b[300009];
ll p[300009],sz[300009],d[300009];
vector<vector<ll> >v;
char c[300009];
bool is[300009],st[300009],vis[300009];
ll gp(ll z)
{
    if(p[z]==z)
        return z;
    return p[z]=gp(p[z]);
}
void mrg(ll x,ll y)
{
    x=gp(x),y=gp(y);
    if(x==y)
        return;
    if(sz[x]<sz[y])
        swap(x,y);
    p[y]=x,sz[x]+=sz[y];
}
void dfs(ll id,ll op)
{
    d[id]=op;
    for(auto z:v[id])
    {
        if(d[z]==0)
            dfs(z,op+1);
        else
            d[z]=max(d[z],op+1);
    }
}
void go(ll id,ll op)
{
    d[id]=max(d[id],op);
    op=d[id];
    vis[id]=1;
    if(d[id]==n)
        return void(is[id]=1);
    for(auto z:v[id])
    {
        if(vis[z]==0)
            go(z,op+1);
        is[id]|=is[z];
    }
}
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin>>n>>m>>k;
    v.resize(m+1);
    for(ll i=1; i<=m; i++)
        p[i]=i,sz[i]=1;
    for(ll i=1; i<=k; i++)
    {
        cin>>a[i]>>c[i]>>b[i];
        if(c[i]=='=')
            mrg(a[i],b[i]);
    }
    for(ll i=1; i<=k; i++)
    {
        if(c[i]=='=')
            continue;
        if(c[i]=='<')
            v[gp(a[i])].push_back(gp(b[i])),st[gp(b[i])]=1;
        else
            v[gp(b[i])].push_back(gp(a[i])),st[gp(a[i])]=1;
    }
    for(ll i=1; i<=m; i++)
        if(st[i]==0&&p[i]==i)
            dfs(i,1);
    for(ll i=1; i<=m; i++)
        if(st[i]==0&&p[i]==i)
            go(i,1);
    for(ll i=1; i<=m; i++)
    {
        if(is[gp(i)])
            cout<<"K"<<d[gp(i)];
        else
            cout<<"?";
        cout<<"\n";
    }
    return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 40 / 40
• Subtask 3: 0 / 10
• Subtask 4: 0 / 40