Submission #851783

#	Time	Username	Problem	Language	Result	Execution time	Memory
851783		prvocislo	Colors (RMI18_colors)	C++17	22 / 100	133 ms	768 KiB

colors

#include <algorithm>
#include <iostream>
#include <map>
#include <queue>
#include <random>
#include <set>
#include <string>
#include <vector>
using namespace std;

struct dsu_rollback
{
    vector<int> p, s, ch;
    dsu_rollback(int n)
    {
        p.resize(n), s.resize(n, 1);
        for (int i = 0; i < n; i++) p[i] = i;
    }
    int root(int i) { return p[i] == i ? i : root(p[i]); }
    void merge(int i, int j)
    {
        i = root(i), j = root(j);
        if (i == j) return;
        if (s[i] < s[j]) swap(i, j);
        p[j] = i, s[i] += s[j], ch.push_back(j);
    }
    void undo(int siz)
    {
        while (ch.size() > siz)
        {
            int v = ch.back(); ch.pop_back();
            s[p[v]] -= s[v], p[v] = v;
        }
    }
};
vector<int> ok, on;
vector<vector<int> > oa, ob, g; // vyskyty a-cok a vyskty b-cok
struct udaj
{
    int l, r, u;
};
bool dandc(int l, int r, vector<udaj> &v, dsu_rollback &d)
{
    int siz = d.ch.size();
    int m = (l + r) / 2;
    vector<udaj> v2;
    for (udaj u : v)
    {
        if (u.r < l || u.l > r) continue;
        if (u.l <= l && r <= u.r)
        {
            on[u.u] = 1;
            for (int i : g[u.u]) if (on[i]) d.merge(u.u, i);
            continue;
        }
        v2.push_back(u);
    }
    bool ans = true;
    if (l == r)
    {
        for (int x : oa[l]) ok[d.root(x)] = 1;
        for (int x : ob[l]) if (!ok[d.root(x)]) ans = false;
        for (int x : oa[l]) ok[d.root(x)] = 0;
    }
    else ans = dandc(l, m, v2, d) && dandc(m + 1, r, v2, d);
    for (udaj u : v) if (u.l <= l && r <= u.r) on[u.u] = 0;
    return ans;
}
int solve()
{
    int n, m;
    cin >> n >> m;
    oa.assign(n, {}), ob.assign(n, {}), g.assign(n, {}), ok.assign(n, 0), on.assign(n, 0);
    vector<int> a(n), b(n);
    for (int i = 0; i < n; i++) cin >> a[i], oa[--a[i]].push_back(i);
    for (int i = 0; i < n; i++) cin >> b[i], ob[--b[i]].push_back(i);
    for (int i = 0, u, v; i < m; i++) cin >> u >> v, g[--u].push_back(--v), g[v].push_back(u);
    vector<udaj> v;
    for (int i = 0; i < n; i++)
    {
        if (a[i] < b[i]) return 0;
        v.push_back({ b[i], a[i], i });
    }
    dsu_rollback d(n);
    return dandc(0, n - 1, v, d);
}
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    int t;
    cin >> t;
    while (t--) cout << solve() << "\n";
    return 0;
}

Compilation message (stderr)

colors.cpp: In member function 'void dsu_rollback::undo(int)':
colors.cpp:29:26: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   29 |         while (ch.size() > siz)
      |                ~~~~~~~~~~^~~~~
colors.cpp: In function 'bool dandc(int, int, std::vector<udaj>&, dsu_rollback&)':
colors.cpp:44:9: warning: unused variable 'siz' [-Wunused-variable]
   44 |     int siz = d.ch.size();
      |         ^~~

• Subtask 1: 15 / 15
• Subtask 2: 7 / 7
• Subtask 3: 0 / 8
• Subtask 4: 0 / 15
• Subtask 5: 0 / 7
• Subtask 6: 0 / 16
• Subtask 7: 0 / 10
• Subtask 8: 0 / 22