This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n;
    cin >> n; 
    vector<pair<int, int>> xs;
    for (int i = 0; i < n; ++i) {
        int x;
        cin >> x;
        xs.emplace_back(x, i);
    }
    sort(xs.rbegin(), xs.rend());
    vector<vector<int>> ans;
    for (int i = 0; i < n; i += xs[i].first) {
        ans.emplace_back();
        for (int j = i; j < i + xs[i].first; ++j)
            ans.back().push_back(xs[j].second);
    }
    cout << ans.size() << endl;
    for (auto xs: ans) {
        cout << xs.size() << " ";
        for (int x: xs)
            cout << x+1 << " ";
        cout << endl;
    }
}
| # | Verdict  | Execution time | Memory | Grader output | 
|---|
| Fetching results... | 
| # | Verdict  | Execution time | Memory | Grader output | 
|---|
| Fetching results... | 
| # | Verdict  | Execution time | Memory | Grader output | 
|---|
| Fetching results... | 
| # | Verdict  | Execution time | Memory | Grader output | 
|---|
| Fetching results... | 
| # | Verdict  | Execution time | Memory | Grader output | 
|---|
| Fetching results... | 
| # | Verdict  | Execution time | Memory | Grader output | 
|---|
| Fetching results... | 
| # | Verdict  | Execution time | Memory | Grader output | 
|---|
| Fetching results... | 
| # | Verdict  | Execution time | Memory | Grader output | 
|---|
| Fetching results... | 
| # | Verdict  | Execution time | Memory | Grader output | 
|---|
| Fetching results... | 
| # | Verdict  | Execution time | Memory | Grader output | 
|---|
| Fetching results... |