#include <bits/stdc++.h> #define int long long using namespace std; signed main() { ios_base::sync_with_stdio(false); cin.tie(0); //freopen("schedule.in","r",stdin); int n,d,m; cin>>n>>d>>m; vector<pair<int,int>> jobs(m); for (int i=0;i<m;i++) { cin>>jobs[i].first; jobs[i].first+=d; jobs[i].second = i+1; } sort(jobs.begin(),jobs.end()); int lo=1,hi=m; auto test=[&](int x) { int curr=0,day=1; while (curr<m) { curr = min(m,curr+x); if (jobs[curr-1].first<day) return false; day++; } return (day-1)<=n; } ; while (lo<hi) { int mid=lo+(hi-lo)/2; if (test(mid)) hi = mid; else lo = mid+1; } cout<<lo<<"\n"; int curr=0,last=0,day=1; while (curr<m) { curr = min(m,curr+lo); for (int i=last;i<curr;i++) cout<<jobs[i].second<<" "; cout<<0<<"\n"; day++; last = curr; } for (int i=day;i<=n;i++) cout<<0<<"\n"; return 0; } // if you get WA, go and read the question carefully again // Then read the code for mixed variables, mistype, not considering a condition, etc.