ya  much works is done by above candidate.
i would like to say..use 2 ptrs one from beginning & another from end
take sum=a[start]+a[end];
find if sum>num
end--
else if sum<num
start++;
else //sum==num
found;

time compexcity O(n)   sizeof array
space compexcity O(1)


Regards
Shashank Mani "Don't Be Evil U Can Learn While U Earn"
Computer Science & Engg.
Birla Institute of Technology,Mesra
Cell +91-9718508004

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