Submission #20297140

Source Code Expand

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#include <bits/stdc++.h>
using namespace std;
using ll = long long;
ll g1(ll x) {
  vector<ll> cnt(10, 0);
  for (ll i = 0; i < 100; i++) {
    if (x == 0) break;
    cnt[x % 10]++;
    x /= 10;
  }
  ll ans = 0;
  for (ll i = 0; i < 100; i++) {
    for (ll j = 9; j >= 0; j--) {
      if (cnt[j] > 0) {
        ans = ans * 10 + j;
        cnt[j]--;
        break;
      }
    }
  }
 
 
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#include <bits/stdc++.h>
using namespace std;
using ll = long long;

ll g1(ll x) {
  vector<ll> cnt(10, 0);
  for (ll i = 0; i < 100; i++) {
    if (x == 0) break;
    cnt[x % 10]++;
    x /= 10;
  }
  ll ans = 0;
  for (ll i = 0; i < 100; i++) {
    for (ll j = 9; j >= 0; j--) {
      if (cnt[j] > 0) {
        ans = ans * 10 + j;
        cnt[j]--;
        break;
      }
    }
  }
  return ans;
}

ll g2(ll x) {
  vector<ll> cnt(10, 0);
  for (ll i = 0; i < 100; i++) {
    if (x == 0) break;
    cnt[x % 10]++;
    x /= 10;
  }
  ll ans = 0;
  for (ll i = 0; i < 100; i++) {
    for (ll j = 1; j < 10; j++) {
      if (cnt[j] > 0) {
        ans = ans * 10 + j;
        cnt[j]--;
        break;
      }
    }
  }
  return ans;
}

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);

  ll N; cin >> N;
  ll K; cin >> K;
  ll ans = N;
  for (ll i = 0; i < K; i++) {
    ans = g1(ans) - g2(ans);
  }
  cout << ans << '\n';
  return 0;
}

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