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Let arr be the given array.
- rohit.in.muzik June 13, 2013And K be the give sum
for i=0 to arr.length - 1 do
hash(arr[i]) = i // key is the element and value is its index.
end-for
for i=0 to arr.length - 1 do
if hash(K - arr[i]) != i // if K - ele exists and is different we found a pair
print "pair i , hash(K - arr[i]) has sum K"
end-if
end-for