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;) {
ans.emplace_back();
for (int j = i; j < i + xs[i].first; ++j)
ans.back().push_back(xs[j].second);
i += xs[i].first;
}
return 92;
cout << ans.size() << '\n';
for (auto xs: ans) {
cout << xs.size() << " ";
for (int x: xs)
cout << x+1 << " ";
cout << '\n';
}
}
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