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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. typedef long long ll;
  4. #define Shoyo ios_base::sync_with_stdio(0);cin.tie(NULL);
  5. #define ff first
  6. #define ss second
  7. #define pii pair<ll,ll>
  8. #define all(v) v.begin(), v.end()
  9. #define allr(v) v.rbegin(), v.rend()
  10. #define cl(x,y)  (x + y - 1) / y
  11. #define el "\n"
  12. ll Mod=998244353;
  13. const pii adj[]={{0,1},{1,0},{-1,0},{0,-1}};
  14. const ll N=2e5+5,M=1e5+7;
  15. ll n;
  16. ll dp[N];
  17. ll val[N];
  18. map<ll,ll> mp;
  19. ll sol(ll i) {
  20.     if (i==n)return 0;
  21. ll &res=dp[i];
  22.     if (~res)return res;
  23.     res=1;
  24.     for (ll j=i+1;j<n;j++) {
  25.         if (val[j]==val[i]+1) {
  26.             res=max(res,1+sol(j));
  27.         }
  28.     }
  29.     return res;
  30. }
  31. void dfs(ll i) {
  32.     cout<<mp[val[i]]<<" ";
  33.     for (ll j=i+1;j<n;j++) {
  34.         if (val[j]==val[i]+1) {
  35.             dfs(j);
  36.             break;
  37.         }
  38.     }
  39. }
  40. void solve() {
  41.     cin>>n;
  42.     memset(dp,-1,sizeof(dp));
  43.     for(ll i=0;i<n;i++) {
  44.         cin>>val[i];
  45.         mp[val[i]]=i+1;
  46.     }
  47.     ll best=0,ii=0;
  48.     for (ll i=0;i<n;i++) {
  49.         if (sol(i)>best) {
  50.             best=sol(i);
  51.             ii=i;
  52.         }
  53.     }
  54.     cout<<best<<el;
  55.   dfs(ii);
  56.  
  57. }
  58. int main(){
  59.     Shoyo;
  60.     ll t=1;
  61.     //  if(!(cin >> t)) return 0;
  62.     while(t--) {
  63.         solve();
  64.     }
  65.     return 0;
  66. }
  67.  
Success #stdin #stdout 0.01s 6140KB
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https://ideone.com/40kYOh
language:
C++14 (gcc 8.3)
created:
4 days ago
visibility:
public

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