Question

How to find all pairs in a list that equal to a given sum in Python

Answer 1

def findAllPairs(lst,  sum) :
    found = False
    length = len(lst)

    for i in range(0, length  -1) :  
        for j in range(i + 1, length) :  
            if (lst[i] + lst[j] == sum) :
                print("lst[" + str(i) + "](" + str(lst[i]) + ") + " + "lst[" + str(j) + "](" + str(lst[j]) + ")")
                found = True
    if (not found) :
        print("Pair not found")


lst = [2, 4, 1, 5, 6, 8, 1]
summ = 10
findAllPairs(lst, summ)




'''
run:

lst[0](2) + lst[5](8)
lst[1](4) + lst[4](6)

'''

 

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