Submission #851826

#	Time	Username	Problem	Language	Result	Execution time	Memory
851826		prvocislo	Colors (RMI18_colors)	C++17	100 / 100	501 ms	51904 KiB

colors

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

const int maxn = 15e4+5;
int p[maxn], s[maxn], ch[maxn];
struct dsu_rollback
{
    int cnt;
    dsu_rollback(int n)
    {
        for (int i = 0; i < n; i++) p[i] = i, s[i] = 1;
        cnt = 0;
    }
    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[cnt++] = j;
    }
    void undo(int siz)
    {
        while (cnt > siz)
        {
            int v = ch[--cnt];
            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.cnt;
    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;
    d.undo(siz);
    return ans;
}
int solve()
{
    int n, m;
    scanf("%d%d", &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++) scanf("%d", &a[i]), oa[--a[i]].push_back(i);
    for (int i = 0; i < n; i++) scanf("%d", &b[i]), ob[--b[i]].push_back(i);
    for (int i = 0, u, v; i < m; i++) scanf("%d%d", &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()
{
    int t;
    scanf("%d", &t);
    while (t--) printf("%d\n", solve());
    return 0;
}

Compilation message (stderr)

colors.cpp: In function 'int solve()':
colors.cpp:76:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   76 |     scanf("%d%d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~
colors.cpp:79:38: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   79 |     for (int i = 0; i < n; i++) scanf("%d", &a[i]), oa[--a[i]].push_back(i);
      |                                 ~~~~~^~~~~~~~~~~~~
colors.cpp:80:38: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   80 |     for (int i = 0; i < n; i++) scanf("%d", &b[i]), ob[--b[i]].push_back(i);
      |                                 ~~~~~^~~~~~~~~~~~~
colors.cpp:81:44: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   81 |     for (int i = 0, u, v; i < m; i++) scanf("%d%d", &u, &v), g[--u].push_back(--v), g[v].push_back(u);
      |                                       ~~~~~^~~~~~~~~~~~~~~~
colors.cpp: In function 'int main()':
colors.cpp:94:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   94 |     scanf("%d", &t);
      |     ~~~~~^~~~~~~~~~

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