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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4. const unsigned long long MOD = 1e9 + 7;
  5. const int INF = (int)2e9 + 7;
  6. const long long LINF = (long long)1e18;
  7. const unsigned long long mod1 = 183453789;
  8. const unsigned long long mod2 = 1234567891;
  9. const int P1 = 337, P2 = 263;
  10.  
  11. template<typename T>
  12. T input(){
  13.     T ans = 0, m = 1; char c = ' ';
  14.     while (!((c >= '0' && c <= '9') || c == '-')) c = getchar();
  15.     if (c == '-') m = -1, c = getchar();
  16.     while (c >= '0' && c <= '9') ans = ans * 10 + (c - '0'), c = getchar();
  17.     return ans * m;
  18. }
  19.  
  20. string nextString(bool flag = false){
  21.     char ch; string ans = "";
  22.     do { ch = getchar(); } while(ch <= ' ');
  23.     while(1) {
  24.         ans += ch; ch = getchar();
  25.         if ( (!flag && ch <= ' ') || (flag && ch < ' ') ) break;
  26.     }
  27.     return ans;
  28. }
  29. char nextChar(){
  30.     char ch;
  31.     do {ch = getchar(); } while(ch <= ' ');
  32.     return ch;
  33. }
  34. void read(string& s){ s = nextString(); }
  35. void read(char& c){ c = nextChar(); }
  36. template<typename T> void read(T& a){ a = input<T>(); }
  37. template<typename T, typename... R> void read(T& a, R&... r){ read(a); read(r...); }
  38.  
  39. map < int, int > m;
  40.  
  41. void print(){
  42.     for (int i = 9; i >= 0; -- i){
  43.         while (m[i] > 0){
  44.             m[i] --;
  45.             cout << i;
  46.         }
  47.     }
  48. }
  49.  
  50. bool erase(int x){
  51.     if (m[x] > 0){
  52.         m[x] --;
  53.         return true;
  54.     } else return false;
  55. }
  56.  
  57. int32_t main(){
  58.     ios_base::sync_with_stdio(0); cin.tie(0);
  59.     #ifdef LOCAL
  60.         freopen("in.txt", "r", stdin);
  61.         freopen("out.txt", "w", stdout);
  62.     #else
  63.         freopen("divisible.in", "r", stdin);
  64.         freopen("divisible.out", "w", stdout);
  65.     #endif
  66.     string temp; read(temp);
  67.     int sum = 0;
  68.     for (auto i: temp){
  69.         (sum += int(i - '0')) %= 3;
  70.         m[int(i - '0')] ++;
  71.     }
  72.     if (sum == 1){
  73.         bool ok = false;
  74.         for (int i = 1; !ok && i < 10; i += 3){
  75.             ok |= erase(i);
  76.         }
  77.         if (!ok){
  78.             int cnt = 0;
  79.             for (int i = 2; cnt < 2 && i < 10; i += 3){
  80.                 while (m[i] > 0 && cnt < 2){
  81.                     m[i] --;
  82.                     cnt ++;
  83.                 }
  84.             }
  85.         }
  86.     } else
  87.     if (sum == 2){
  88.         bool ok = false;
  89.         for (int i = 2; !ok && i < 10; i += 3){
  90.             ok |= erase(i);
  91.         }
  92.         if (!ok){
  93.             int cnt = 0;
  94.             for (int i = 1; cnt < 2 && i < 10; i += 3){
  95.                 while (m[i] > 0 && cnt < 2){
  96.                     m[i] --;
  97.                     cnt ++;
  98.                 }
  99.             }   
  100.         }
  101.     }
  102.  
  103.     print();
  104. }
Time limit exceeded #stdin #stdout 5s 3460KB
comments (?)
stdin 
Standard input is empty
stdout 
Standard output is empty
https://ideone.com/Z5aOit
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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