calcule de combinaison appartir d un tableau Fermé

Question

Bonjour, 

je veux  crée cette combinaison iteration
1.   A1 = A2      and  B1 = B2     and C1 = C2    and D1 = D2            
2.   A1 = A2      and  B1 = B2     and C1 = C2    and D2 = null          
3.   A1 = A2      and  B1 = B2     and C2 = null   and D1 = D2             
4.   A1 = A2      and  B2 = null    and C1 = C2    and D1 = D2          
5.   A2 = null     and  B1 = B2     and C1 = C2    and D1 = D2                 
6.   A1 = A2      and  B1 = B2     and C2 = null   and D2 = null          
7.   A1 = A2      and  B2 = null    and C2 = null   and D1 = D2           
8.   A1 = A2      and  B2 = null    and C1 = C2    and D2 = null    
...
n   A2 = nul     and  B2 = null    and C2 = nul    and D2 = null  

appartir de {A ,B ,C ,D}

j ai concu un algorithme basé sur le lien suivant :
https://www.geeksforgeeks.org/print-all-possible-combinations-of-r-elements-in-a-given-array-of-size-n/ 

                
Configuration: Windows / Chrome 76.0.3809.132

KX · Answer

Bonjour,

Pas besoin de se prendre trop la tête avec un algorithme générique, c'est très scolaire et ça peut s'écrire directement avec des boucles :

for (int a = 0; a < 2; a++)
    for (int b = 0; b < 2; b++)
        for (int c = 0; c < 2; c++)
            for (int d = 0; d < 2; d++)
                System.out.printf("%s and %s and %s and %s
",
                    a == 0 ? "A1 = A2" : "A2 = null",
                    b == 0 ? "B1 = B2" : "B2 = null",
                    c == 0 ? "C1 = C2" : "C2 = null",
                    d == 0 ? "D1 = D2" : "D2 = null");

Calcule de combinaison appartir d un tableau

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