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  1. //Kéo xuống dưới copy test :Đ
  2. //Đề Bài: Tìm số lớn nhất tạo ra bởi việc ghép 2 số có tổng các chữ số giống nhau
  3. #include<bits/stdc++.h>
  4. #define ull unsigned long long
  5. #define ll long long
  6. #define all(x) x.begin(), x.end()
  7. using namespace std;
  8. const int maxn = 1e5 + 1;
  9. ll A[maxn];
  10. vector<ll> D[46];
  11. pair<ll, ll> scs[maxn];
  12. int sumDigit(int n) {
  13.     int s = 0;
  14.     while (n != 0) {
  15.         s += n % 10;
  16.         n /= 10;
  17.     }
  18.     return s;
  19. }
  20. int cntDigit(int n) {
  21.     int cnt = 0;
  22.     while (n != 0) {
  23.         cnt++;
  24.         n /= 10;
  25.     }
  26.     return cnt;
  27. }
  28. ll lt[12];
  29. void tenEn() {
  30.     lt[0] = 1;
  31.     for (int i = 1; i <= 10; ++i) {
  32.         lt[i] = lt[i - 1] * 10;
  33.     }
  34. }
  35. int main() {
  36.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  37.     // freopen("file.inp","r",stdin);
  38.     // freopen("file.out","w",stdout);
  39.     tenEn();
  40.     int n;
  41.     ll res = 0;
  42.     cin >> n;
  43.     for (int i = 1; i <= n; ++i) {
  44.         cin >> A[i];
  45.     }
  46.     sort(A + 1, A + n + 1);
  47.     for (int i = 1; i <= n; ++i) {
  48.         D[sumDigit(A[i])].push_back(A[i]);
  49.     }
  50.     for (int i = 0; i <= 45; ++i) {
  51.         if (D[i].size() < 2) continue;
  52.         ll a = (D[i][D[i].size() - 1] * lt[scs[D[i].size() - 2].first] + D[i][D[i].size() - 2]);
  53.         ll b = (D[i][D[i].size() - 2] * lt[scs[D[i].size() - 1].first] + D[i][D[i].size() - 1]);
  54.         res = max(res, max(a, b));
  55.     }
  56.     cout << res;
  57. }
Success #stdin #stdout 0.01s 5280KB
comments (?)
stdin
copy 
6
47 77 95 12 3 3000
stdout
copy 
300012
https://ideone.com/B2QTwp
Last Subtask
language:
C++14 (gcc 8.3)
created:
10 days ago
visibility:
public

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