#practiceLinkDiv { mostrar: ninguno !importante; }Dada una cadena que contiene dígitos de un número. El número puede contener muchos dígitos continuos iguales. La tarea consiste en contar varias formas de deletrear el número.
Por ejemplo, considere 8884441100, uno puede deletrearlo simplemente como triple ocho triple cuatro doble dos y doble cero. También se puede escribir doble ocho ocho cuatro doble cuatro dos dos doble cero.
Ejemplos:
Input : num = 100 Output : 2 The number 100 has only 2 possibilities 1) one zero zero 2) one double zero. Input : num = 11112 Output: 8 1 1 1 1 2 11 1 1 2 1 1 11 2 1 11 1 2 11 11 2 1 111 2 111 1 2 1111 2 Input : num = 8884441100 Output: 64 Input : num = 12345 Output: 1 Input : num = 11111 Output: 16Recommended Practice Deletrear un número ¡Pruébalo!
Este es un problema simple de permutación y combinación. Si tomamos el caso de prueba de ejemplo dado en la pregunta 11112. La respuesta depende del número de subcadenas posibles de 1111. El número de subcadenas posibles de '1111' es 2^3 = 8 porque es el número de combinaciones de 4 - 1 = 3 separadores '|' entre dos caracteres de la cadena (dígitos del número representado por la cadena): '1|1|1|1'. Como nuestras combinaciones dependerán de si elegimos un 1 en particular y para '2' solo habrá una posibilidad 2^0 = 1, por lo que la respuesta para '11112' será 8*1 = 8.
Entonces, el enfoque es contar el dígito continuo particular en la cadena y multiplicar 2^(cuenta-1) con el resultado anterior.
C++// C++ program to count number of ways we // can spell a number #include using namespace std; typedef long long int ll; // Function to calculate all possible spells of // a number with repeated digits // num --> string which is favourite number ll spellsCount(string num) { int n = num.length(); // final count of total possible spells ll result = 1; // iterate through complete number for (int i=0; i<n; i++) { // count contiguous frequency of particular // digit num[i] int count = 1; while (i < n-1 && num[i+1] == num[i]) { count++; i++; } // Compute 2^(count-1) and multiply with result result = result * pow(2 count-1); } return result; } // Driver program to run the case int main() { string num = '11112'; cout << spellsCount(num); return 0; }
Java // Java program to count number of ways we // can spell a number import java.io.*; class GFG { // Function to calculate all possible // spells of a number with repeated digits // num --> string which is favourite number static long spellsCount(String num) { int n = num.length(); // final count of total possible spells long result = 1; // iterate through complete number for (int i = 0; i < n; i++) { // count contiguous frequency of // particular digit num[i] int count = 1; while (i < n - 1 && num.charAt(i + 1) == num.charAt(i)) { count++; i++; } // Compute 2^(count-1) and multiply // with result result = result * (long)Math.pow(2 count - 1); } return result; } public static void main(String[] args) { String num = '11112'; System.out.print(spellsCount(num)); } } // This code is contributed by Anant Agarwal.
Python3 # Python3 program to count number of # ways we can spell a number # Function to calculate all possible # spells of a number with repeated # digits num --> string which is # favourite number def spellsCount(num): n = len(num); # final count of total # possible spells result = 1; # iterate through complete # number i = 0; while(i<n): # count contiguous frequency # of particular digit num[i] count = 1; while (i < n - 1 and num[i + 1] == num[i]): count += 1; i += 1; # Compute 2^(count-1) and # multiply with result result = result * int(pow(2 count - 1)); i += 1; return result; # Driver Code num = '11112'; print(spellsCount(num)); # This code is contributed # by mits
C# // C# program to count number of ways we // can spell a number using System; class GFG { // Function to calculate all possible // spells of a number with repeated // digits num --> string which is // favourite number static long spellsCount(String num) { int n = num.Length; // final count of total possible // spells long result = 1; // iterate through complete number for (int i = 0; i < n; i++) { // count contiguous frequency of // particular digit num[i] int count = 1; while (i < n - 1 && num[i + 1] == num[i]) { count++; i++; } // Compute 2^(count-1) and multiply // with result result = result * (long)Math.Pow(2 count - 1); } return result; } // Driver code public static void Main() { String num = '11112'; Console.Write(spellsCount(num)); } } // This code is contributed by nitin mittal.
PHP // PHP program to count // number of ways we // can spell a number // Function to calculate // all possible spells of // a number with repeated // digits num --> string // which is favourite number function spellsCount($num) { $n = strlen($num); // final count of total // possible spells $result = 1; // iterate through // complete number for ($i = 0; $i < $n; $i++) { // count contiguous frequency // of particular digit num[i] $count = 1; while ($i < $n - 1 && $num[$i + 1] == $num[$i]) { $count++; $i++; } // Compute 2^(count-1) and // multiply with result $result = $result * pow(2 $count - 1); } return $result; } // Driver Code $num = '11112'; echo spellsCount($num); // This code is contributed // by nitin mittal. ?> JavaScript <script> // Javascript program to count number of // ways we can spell a number // Function to calculate all possible // spells of a number with repeated // digits num --> string which is // favourite number function spellsCount(num) { let n = num.length; // Final count of total possible // spells let result = 1; // Iterate through complete number for (let i = 0; i < n; i++) { // Count contiguous frequency of // particular digit num[i] let count = 1; while (i < n - 1 && num[i + 1] == num[i]) { count++; i++; } // Compute 2^(count-1) and multiply // with result result = result * Math.pow(2 count - 1); } return result; } // Driver code let num = '11112'; document.write(spellsCount(num)); // This code is contributed by code_hunt </script>
Producción
8
Complejidad del tiempo: O(n*log(n))
Espacio Auxiliar: O(1)
Si tiene otro enfoque para resolver este problema, compártalo.