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  1. //BRUTE FORCE
  2. #include<bits/stdc++.h>
  3. #define ull unsigned long long
  4. #define ll long long
  5. #define all(x) x.begin(), x.end()
  6. using namespace std;
  7. const int maxn = 1e5 + 1;
  8. ll A[maxn];
  9. vector<ll> D[46];
  10. pair<ll, ll> scs[maxn];
  11. int sumDigit(int n) {
  12.     int s = 0;
  13.     while (n != 0) {
  14.         s += n % 10;
  15.         n /= 10;
  16.     }
  17.     return s;
  18. }
  19. int cntDigit(int n) {
  20.     int cnt = 0;
  21.     while (n != 0) {
  22.         cnt++;
  23.         n /= 10;
  24.     }
  25.     return cnt;
  26. }
  27. ll lt[12];
  28. void tenEn() {
  29.     lt[0] = 1;
  30.     for (int i = 1; i <= 10; ++i) {
  31.         lt[i] = lt[i - 1] * 10;
  32.     }
  33. }
  34. int main() {
  35.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  36.     // freopen("file.inp","r",stdin);
  37.     // freopen("file.out","w",stdout);
  38.     tenEn();
  39.     int n;
  40.     ll res = 0;
  41.     cin >> n;
  42.     for (int i = 1; i <= n; ++i) {
  43.         cin >> A[i];
  44.         D[sumDigit(A[i])].push_back(A[i]);
  45.     }
  46.     for (int i = 0; i <= 45; ++i) {
  47.         if (D[i].size() < 2) continue;
  48.         for (int j = 0; j < D[i].size(); ++j) {
  49.             scs[j].first = cntDigit(D[i][j]); scs[j].second = D[i][j];
  50.         }
  51.         for (int j = 0; j < D[i].size(); ++j) {
  52.             for (int k = j + 1; k < D[i].size(); ++k) {
  53.                 ll a = (scs[j].second * lt[cntDigit(scs[k].second)] + scs[k].second);
  54.                 ll b = (scs[k].second * lt[cntDigit(scs[j].second)] + scs[j].second);
  55.                 res = max(res, max(a, b));
  56.             }
  57.         }
  58.     }
  59.     cout << res;
  60. }
Success #stdin #stdout 0.01s 5280KB
comments (?)
stdin
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6
47 77 95 12 3 3000
stdout
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300012
https://ideone.com/s2RcFJ
Brute Force
language:
C++14 (gcc 8.3)
created:
10 days ago
visibility:
public

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