oj.uz

Submission #1049265

# Submission time Handle Problem Language Result Execution time Memory
1049265 2024-08-08T15:45:21 Z windowwife Joker (BOI20_joker) C++14
25 / 100
 127 ms 15048 KB 
#include<bits/stdc++.h>
#define ll long long
#define task ""
using namespace std;
const int maxn = 4e5 + 2;
int n, m, q, max_r[maxn], u[maxn], v[maxn], l, r, par[maxn];
vector<pair<int, int>> rb;
int find_set (int u)
{
    if (par[u] < 0) return u;
    return find_set(par[u]);
}
void union_set (int u, int v)
{
    int pu = find_set(u), pv = find_set(v);
    if (pu == pv) return;
    if (par[pu] > par[pv]) swap(pu, pv);
    rb.push_back({pu, par[pu]});
    rb.push_back({pv, par[pv]});
    par[pu] += par[pv];
    par[pv] = pu;
}
void rollback ()
{
    if (rb.empty()) return;
    par[rb.back().first] = rb.back().second;
    rb.pop_back();
}
void pbs (int low, int high, int r)
{
    if (low > high) return;
    //cout << low << " " << high << " " << r << endl;
    int mid = (low + high)/2, tmp = rb.size();
    for (int i = low; i < mid; i++)
    {
        //cout << i << endl;
        union_set(u[i], v[i] + n);
        union_set(u[i] + n, v[i]);
        if (find_set(u[i]) == find_set(u[i] + n))
        {
            for (int j = mid; j <= high; j++) max_r[j] = r;
            while ((int)rb.size() > tmp) rollback();
            pbs(low, mid - 1, r);
            return;
        }
    }
    int tmp2 = rb.size();
    for (int i = r - 1; i >= low; i--)
    {
        union_set(u[i], v[i] + n);
        union_set(u[i] + n, v[i]);
        if (find_set(u[i]) == find_set(u[i] + n))
        {
            max_r[mid] = i;
            break;
        }
    }
    while ((int)rb.size() > tmp2) rollback();
    pbs(mid + 1, high, r);
    while ((int)rb.size() > tmp) rollback();
    for (int i = r - 1; i >= max(max_r[mid], low); i--)
    {
        union_set(u[i], v[i] + n);
        union_set(u[i] + n, v[i]);
        if (find_set(u[i]) == find_set(u[i] + n))
        {
            for (int j = low; j <= mid; j++) max_r[j] = max_r[mid];
            return;
        }
    }
    pbs(low, mid - 1, max_r[mid]);
}
int main ()
{
    //freopen(task".INP", "r", stdin);
    //freopen(task".OUT", "w", stdout);
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin >> n >> m >> q;
    for (int i = 1; i <= 2*n; i++) par[i] = -1;
    for (int i = 1; i <= m; i++) cin >> u[i] >> v[i];
    pbs(1, m, m + 1);
    while (q--)
    {
        cin >> l >> r;
        cout << (r < max_r[l] ? "YES" : "NO") << '\n';
    }
}

Subtask #1
0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4444 KB Output is correct
2 Correct 0 ms 4444 KB Output is correct
3 Correct 1 ms 4444 KB Output is correct
4 Incorrect 0 ms 4444 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #2
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4444 KB Output is correct
2 Correct 0 ms 4444 KB Output is correct
3 Correct 1 ms 4444 KB Output is correct
4 Incorrect 0 ms 4444 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4444 KB Output is correct
2 Correct 0 ms 4444 KB Output is correct
3 Correct 127 ms 9408 KB Output is correct
4 Correct 92 ms 15048 KB Output is correct
5 Correct 62 ms 14276 KB Output is correct
6 Correct 67 ms 10448 KB Output is correct
7 Correct 66 ms 9300 KB Output is correct
8 Correct 80 ms 8132 KB Output is correct
9 Correct 88 ms 10196 KB Output is correct
10 Correct 113 ms 9684 KB Output is correct
11 Correct 101 ms 9680 KB Output is correct
12 Correct 103 ms 10700 KB Output is correct
13 Correct 78 ms 6860 KB Output is correct
14 Correct 89 ms 7972 KB Output is correct
15 Correct 111 ms 9272 KB Output is correct
16 Correct 114 ms 10444 KB Output is correct

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4444 KB Output is correct
2 Correct 0 ms 4444 KB Output is correct
3 Correct 1 ms 4444 KB Output is correct
4 Incorrect 0 ms 4444 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #5
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4444 KB Output is correct
2 Correct 0 ms 4444 KB Output is correct
3 Correct 1 ms 4444 KB Output is correct
4 Incorrect 0 ms 4444 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #6
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4444 KB Output is correct
2 Correct 0 ms 4444 KB Output is correct
3 Correct 1 ms 4444 KB Output is correct
4 Incorrect 0 ms 4444 KB Output isn't correct
5 Halted 0 ms 0 KB -