Submission #1120474

#	Time	Username	Problem	Language	Result	Execution time	Memory
1120474		vjudge1	KOVANICE (COI15_kovanice)	C++17	100 / 100	336 ms	49412 KiB

kovanice

#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx,avx2,fma")

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

/* DEFINES */
#define F first
#define S second
#define ll long long
#define ull unsigned long long
#define ld long double
#define npos ULLONG_MAX
#define INF LLONG_MAX
#define vv(a) vector<a>
#define pp(a, b) pair<a, b>
#define pq(a) priority_queue<a>
#define qq(a) queue<a>
#define ss(a) set<a>
#define mm(a, b) map<a, b>
#define ump(a, b) unordered_map<a, b>
#define sync                      \
    ios_base::sync_with_stdio(0); \
    cin.tie(0);                   \
    cout.tie(0);
#define elif else if
#define endl "\n"
#define allc(a) begin(a), end(a)
#define all(a) a, a + sizeof(a) / sizeof(a[0])
#define pb push_back
#define logi(a) __lg(a)
#define sqrt(a) sqrtl(a)
#define mpr make_pair
#define ins insert
using namespace std;
using namespace __gnu_pbds;
using namespace __cxx11;
typedef char chr;
typedef basic_string<chr> str;
template <typename T, typename key = less<T>>
using ordered_set = tree<T, null_type, key, rb_tree_tag, tree_order_statistics_node_update>;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
const ll N = 3e5 + 5;
vv(ll) g[N], gr[N];
struct Dsu
{
    ll n;
    vv(ll) dsu;
    ll cur;
    Dsu(ll sz = 1)
    {
        n = sz;
        cur = n;
        dsu.resize(n + 1, 0);
    }
    void init()
    {
        for (ll i = 1; i <= n; i++)
            dsu[i] = i;
    }
    bool Union(ll x, ll y)
    {
        x = repr(x), y = repr(y);
        if (x == y)
            return false;
        dsu[x] = y;
        cur--;
        return true;
    }
    ll repr(ll x)
    {
        if (dsu[x] == x)
            return x;
        return dsu[x] = repr(dsu[x]);
    }
    ll query()
    {
        return cur;
    }
};
ll calc[N], K[N];
void dfs(ll v)
{
    calc[v] = 1;
    for (ll to : g[v])
    {
        if (!calc[to])
            dfs(to);
        calc[v] = max(calc[v], calc[to] + 1);
    }
}
void dfs1(ll v)
{
    for (ll to : g[v])
        if (calc[to] + 1 == calc[v] and !K[to])
            K[to] = K[v] + 1, dfs1(to);
}
void solve()
{
    ll n, m, v;
    cin >> n >> m >> v;
    tuple<ll, chr, ll> f[v];
    Dsu dsu(m);
    dsu.init();
    for (ll i = 0; i < v; i++)
    {
        ll a, b;
        chr c;
        cin >> a >> c >> b;
        f[i] = {a, c, b};
        if (c == '=')
            dsu.Union(a, b);
    }
    for (ll i = 0; i < v; i++)
    {
        ll a, b;
        chr c;
        tie(a, c, b) = f[i];
        a = dsu.repr(a);
        b = dsu.repr(b);
        if (c != '=')
        {
            if (c == '>')
                swap(a, b);
            g[a].pb(b);
            gr[b].pb(a);
        }
    }
    for (ll i = 1; i <= m; i++)
    {
        // cout << dsu.repr(i) << endl;
        if (!gr[dsu.repr(i)].size() and !calc[dsu.repr(i)])
            dfs(dsu.repr(i));
    }
    for (ll i = 1; i <= m; i++)
        if (!gr[dsu.repr(i)].size() and calc[dsu.repr(i)] == n)
            K[dsu.repr(i)] = 1, dfs1(dsu.repr(i));
    for (ll i = 1; i <= m; i++)
        if (K[dsu.repr(i)] == 0)
            cout << "?\n";
        else
            cout << "K" << K[dsu.repr(i)] << endl;
}
/*

*/
int main()
{
    sync
        // precomp();
        ll t = 1;
    // cin >> t;
    for (ll i = 1; i <= t; i++)
        // cout << "Case " << i << ": ",
        solve();
    cerr << "\nTime elapsed : " << clock() * 1000.0 / CLOCKS_PER_SEC << " ms\n";
}

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