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sandeep

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The Sinking Island

frist A and B in 2 mnts A returns to give flash light in 1 mnts

Now A and C in 5 mnts A returns to give flash light in 1 mnts frist A and D in 10 mnts A returns to give flash light in 1 mnts Total 19 mnts

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The Sinking Island

sorry in last line of my answer A does not need come back it's a mistake of copy and paste of above line

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Swap Variables in Place without XOR

solution: a=a+b; b=a-b; a=a-b; example: a=2,b=3 a=2+3; (a=5) b=5-3; (b=2) a=5-2; (a=3) now a=3,b=2

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