Mazākais skaitlis ar doto ciparu skaitu un summu

Mazākais skaitlis ar doto ciparu skaitu un summu
Izmēģiniet to GFG praksē

Ņemot vērā divus veselus skaitļus s un s atrast mazākais Iespējamais skaitlis, kam ir tieši d cipari un a ciparu summa vienāds ar s Apvidū
Atgriezt numuru kā a stūra Apvidū Ja šāds skaitlis neatgriežas '-1' Apvidū

Piemēri:

Ievade: S = 9 d = 2
Izlaide: 18
Paskaidrojums: 18 ir mazākais iespējamais skaitlis ar ciparu summu = 9 un kopējie cipari = 2.

Ievade: S = 20 d = 3
Izlaide: 299
Paskaidrojums: 299 ir mazākais iespējamais skaitlis ar ciparu summu = 20 un kopējie cipari = 3.

Ievade: s = 1 d = 1
Izlaide: Viens
Paskaidrojums: 1 ir mazākais iespējamais skaitlis ar ciparu summu = 1 un kopējais cipars = 1.

Satura rādītājs

[Brute -Force pieeja] atkārtojas secīgi - o (d*(10^d)) laiks un o (1) telpa

Tā kā skaitļi ir secīgi, brutāla spēka pieeja iterāti no mazākais d-cipara numurs uz lielākais pārbaudot katru no tiem. Par katru numuru, ko mēs aprēķinām tā ciparu summa un atgrieziet pirmo derīgo sakritību, nodrošinot, ka ir izvēlēts pēc iespējas mazākais skaitlis. Ja nepastāv derīgs numurs, mēs atgriežamies '-1' Apvidū

C++
   // C++ program to find the smallest d-digit   // number with the given sum using    // a brute force approach   #include          using     namespace     std  ;   string     smallestNumber  (  int     s       int     d  )     {          // The smallest d-digit number is 10^(d-1)      int     start     =     pow  (  10       d     -     1  );          // The largest d-digit number is 10^d - 1      int     end     =     pow  (  10       d  )     -     1  ;      // Iterate through all d-digit numbers      for     (  int     num     =     start  ;     num      <=     end  ;     num  ++  )     {          int     sum     =     0       x     =     num  ;      // Calculate sum of digits      while     (  x     >     0  )     {      sum     +=     x     %     10  ;      x     /=     10  ;      }      // If sum matches return the number      // as a string      if     (  sum     ==     s  )     {      return     to_string  (  num  );      }      }      // If no valid number is found return '-1'      return     '-1'  ;   }   // Driver Code   int     main  ()     {          int     s     =     9       d     =     2  ;          cout      < <     smallestNumber  (  s       d  )      < <     endl  ;      return     0  ;   }   
Java
   // Java program to find the smallest d-digit   // number with the given sum using    // a brute force approach   import     java.util.*  ;   class   GfG     {          static     String     smallestNumber  (  int     s       int     d  )     {          // The smallest d-digit number is 10^(d-1)      int     start     =     (  int  )     Math  .  pow  (  10       d     -     1  );          // The largest d-digit number is 10^d - 1      int     end     =     (  int  )     Math  .  pow  (  10       d  )     -     1  ;      // Iterate through all d-digit numbers      for     (  int     num     =     start  ;     num      <=     end  ;     num  ++  )     {          int     sum     =     0       x     =     num  ;      // Calculate sum of digits      while     (  x     >     0  )     {      sum     +=     x     %     10  ;      x     /=     10  ;      }      // If sum matches return the number      // as a string      if     (  sum     ==     s  )     {      return     Integer  .  toString  (  num  );      }      }      // If no valid number is found return '-1'      return     '-1'  ;      }      // Driver Code      public     static     void     main  (  String  []     args  )     {          int     s     =     9       d     =     2  ;          System  .  out  .  println  (  smallestNumber  (  s       d  ));      }   }   
Python
   # Python program to find the smallest d-digit   # number with the given sum using    # a brute force approach   def   smallestNumber  (  s     d  ):   # The smallest d-digit number is 10^(d-1)   start   =   10  **  (  d   -   1  )   # The largest d-digit number is 10^d - 1   end   =   10  **  d   -   1   # Iterate through all d-digit numbers   for   num   in   range  (  start     end   +   1  ):   sum_digits   =   0   x   =   num   # Calculate sum of digits   while   x   >   0  :   sum_digits   +=   x   %   10   x   //=   10   # If sum matches return the number   # as a string   if   sum_digits   ==   s  :   return   str  (  num  )   # If no valid number is found return '-1'   return   '-1'   # Driver Code   if   __name__   ==   '__main__'  :   s     d   =   9     2   print  (  smallestNumber  (  s     d  ))   
C#
   // C# program to find the smallest d-digit   // number with the given sum using    // a brute force approach   using     System  ;   class     GfG     {          static     string     smallestNumber  (  int     s       int     d  )     {          // The smallest d-digit number is 10^(d-1)      int     start     =     (  int  )  Math  .  Pow  (  10       d     -     1  );          // The largest d-digit number is 10^d - 1      int     end     =     (  int  )  Math  .  Pow  (  10       d  )     -     1  ;      // Iterate through all d-digit numbers      for     (  int     num     =     start  ;     num      <=     end  ;     num  ++  )     {          int     sum     =     0       x     =     num  ;      // Calculate sum of digits      while     (  x     >     0  )     {      sum     +=     x     %     10  ;      x     /=     10  ;      }      // If sum matches return the number      // as a string      if     (  sum     ==     s  )     {      return     num  .  ToString  ();      }      }      // If no valid number is found return '-1'      return     '-1'  ;      }      // Driver Code      public     static     void     Main  ()     {          int     s     =     9       d     =     2  ;          Console  .  WriteLine  (  smallestNumber  (  s       d  ));      }   }   
JavaScript
   // JavaScript program to find the smallest d-digit   // number with the given sum using    // a brute force approach   function     smallestNumber  (  s       d  )     {          // The smallest d-digit number is 10^(d-1)      let     start     =     Math  .  pow  (  10       d     -     1  );          // The largest d-digit number is 10^d - 1      let     end     =     Math  .  pow  (  10       d  )     -     1  ;      // Iterate through all d-digit numbers      for     (  let     num     =     start  ;     num      <=     end  ;     num  ++  )     {          let     sum     =     0       x     =     num  ;      // Calculate sum of digits      while     (  x     >     0  )     {      sum     +=     x     %     10  ;      x     =     Math  .  floor  (  x     /     10  );      }      // If sum matches return the number      // as a string      if     (  sum     ===     s  )     {      return     num  .  toString  ();      }      }      // If no valid number is found return '-1'      return     '-1'  ;   }   // Driver Code   let     s     =     9       d     =     2  ;   console  .  log  (  smallestNumber  (  s       d  ));   

Izvade
18  

[Paredzamā pieeja] Izmantojot mantkārīgu paņēmienu - O (D) Laiks un O (1) telpa

Šī pieeja nodrošina kreiso ciparu nav nulle Tātad mēs Rezerve 1 par to un sadaliet atlikušo summu no pa labi uz kreiso pusi veidot pēc iespējas mazāku skaitli. Līdz alkatīga pieeja palīdz novietot lielākās iespējamās vērtības (līdz 9) pie labās pozīcijas lai skaitlis būtu mazs.

Iepriekšējās idejas ieviešanas darbības:

  • Pārbaudiet ierobežojumus, lai nodrošinātu a derīga summa s var veidot, izmantojot d cipari citādi atgriezties '-1' Apvidū
  • Inicializēt rezultāts kā virkne D '0 un Rezerve 1 par Kreisais cipars samazinot S pa 1 Apvidū
  • Šķērsot no pa labi uz kreiso pusi un novietot lielākais iespējamais cipars ( <= 9) Atjaunināšanas laikā s attiecīgi.
  • Ja s <= 9 novietojiet tā vērtību pašreizējā pozīcijā un iestatiet S = 0 Lai apturētu turpmākus atjauninājumus.
  • Piešķirt Kreisais cipars Pievienojot atlikušie s lai nodrošinātu, ka tas paliek ne-nulle Apvidū
  • Pārveidot rezultāts virkne nepieciešamajā formātā un atgriezties tā kā galīgā izvade.
C++
   // C++ program to find the smallest d-digit    // number with the given sum using   // Greedy Technique   #include          using     namespace     std  ;   string     smallestNumber  (  int     s       int     d  )     {          // If sum is too small or too large       // for d digits      if     (  s      <     1     ||     s     >     9     *     d  )     {      return     '-1'  ;      }      string     result  (  d       '0'  );             // Reserve 1 for the leftmost digit      s  --  ;         // Fill digits from right to left      for     (  int     i     =     d     -     1  ;     i     >     0  ;     i  --  )     {          // Place the largest possible value  <= 9      if     (  s     >     9  )     {      result  [  i  ]     =     '9'  ;      s     -=     9  ;      }     else     {      result  [  i  ]     =     '0'     +     s  ;      s     =     0  ;      }      }      // Place the leftmost digit ensuring      // it's non-zero      result  [  0  ]     =     '1'     +     s  ;          return     result  ;   }   // Driver Code   int     main  ()     {          int     s     =     9       d     =     2  ;          cout      < <     smallestNumber  (  s       d  )      < <     endl  ;      return     0  ;   }   
Java
   // Java program to find the smallest d-digit    // number with the given sum using   // Greedy Technique   import     java.util.*  ;   class   GfG     {          static     String     smallestNumber  (  int     s       int     d  )     {          // If sum is too small or too large       // for d digits      if     (  s      <     1     ||     s     >     9     *     d  )     {      return     '-1'  ;      }      char  []     result     =     new     char  [  d  ]  ;      Arrays  .  fill  (  result       '0'  );          // Reserve 1 for the leftmost digit      s  --  ;      // Fill digits from right to left      for     (  int     i     =     d     -     1  ;     i     >     0  ;     i  --  )     {          // Place the largest possible value  <= 9      if     (  s     >     9  )     {      result  [  i  ]     =     '9'  ;      s     -=     9  ;      }     else     {      result  [  i  ]     =     (  char  )     (  '0'     +     s  );      s     =     0  ;      }      }      // Place the leftmost digit ensuring      // it's non-zero      result  [  0  ]     =     (  char  )     (  '1'     +     s  );          return     new     String  (  result  );      }      // Driver Code      public     static     void     main  (  String  []     args  )     {          int     s     =     9       d     =     2  ;          System  .  out  .  println  (  smallestNumber  (  s       d  ));      }   }   
Python
   # Python program to find the smallest d-digit    # number with the given sum using   # Greedy Technique   def   smallestNumber  (  s     d  ):   # If sum is too small or too large    # for d digits   if   s    <   1   or   s   >   9   *   d  :   return   '-1'   result   =   [  '0'  ]   *   d   # Reserve 1 for the leftmost digit   s   -=   1   # Fill digits from right to left   for   i   in   range  (  d   -   1     0     -  1  ):   # Place the largest possible value  <= 9   if   s   >   9  :   result  [  i  ]   =   '9'   s   -=   9   else  :   result  [  i  ]   =   str  (  s  )   s   =   0   # Place the leftmost digit ensuring   # it's non-zero   result  [  0  ]   =   str  (  1   +   s  )   return   ''  .  join  (  result  )   # Driver Code   if   __name__   ==   '__main__'  :   s     d   =   9     2   print  (  smallestNumber  (  s     d  ))   
C#
   // C# program to find the smallest d-digit    // number with the given sum using   // Greedy Technique   using     System  ;   class     GfG     {      static     string     smallestNumber  (  int     s       int     d  )     {          // If sum is too small or too large       // for d digits      if     (  s      <     1     ||     s     >     9     *     d  )     {      return     '-1'  ;      }      char  []     result     =     new     char  [  d  ];      Array  .  Fill  (  result       '0'  );      // Reserve 1 for the leftmost digit      s  --  ;      // Fill digits from right to left      for     (  int     i     =     d     -     1  ;     i     >     0  ;     i  --  )     {          // Place the largest possible value  <= 9      if     (  s     >     9  )     {      result  [  i  ]     =     '9'  ;      s     -=     9  ;      }     else     {      result  [  i  ]     =     (  char  )     (  '0'     +     s  );      s     =     0  ;      }      }      // Place the leftmost digit ensuring      // it's non-zero      result  [  0  ]     =     (  char  )     (  '1'     +     s  );          return     new     string  (  result  );      }      // Driver Code      static     void     Main  ()     {          int     s     =     9       d     =     2  ;          Console  .  WriteLine  (  smallestNumber  (  s       d  ));      }   }   
JavaScript
   // JavaScript program to find the smallest d-digit    // number with the given sum using   // Greedy Technique   function     smallestNumber  (  s       d  )     {          // If sum is too small or too large       // for d digits      if     (  s      <     1     ||     s     >     9     *     d  )     {      return     '-1'  ;      }      let     result     =     Array  (  d  ).  fill  (  '0'  );         // Reserve 1 for the leftmost digit      s  --  ;      // Fill digits from right to left      for     (  let     i     =     d     -     1  ;     i     >     0  ;     i  --  )     {          // Place the largest possible value  <= 9      if     (  s     >     9  )     {      result  [  i  ]     =     '9'  ;      s     -=     9  ;      }     else     {      result  [  i  ]     =     String  (  s  );      s     =     0  ;      }      }      // Place the leftmost digit ensuring      // it's non-zero      result  [  0  ]     =     String  (  1     +     s  );          return     result  .  join  (  ''  );   }   // Driver Code   let     s     =     9       d     =     2  ;   console  .  log  (  smallestNumber  (  s       d  ));   

Izvade
18