SDE - 1

First sort the array and then try to compare the number with positive number.

This puzzle is not really difficult to solve if you really put your mind to work. The approach entails slicing the cake horizontally down the centre, followed by making another division vertically through the centre. The two divisions made across horizontal and vertical directions will give you 4 equal pieces of the cake.

In the final step, simply stack the 4 pieces one above the other, and then make the third division, splitting the stack into half. This gives you the 8 equal pieces of cake, along with answer to your puzzle.

The person has to initially turn on the first switch and keep it on for 2-3 minutes. Next, turn off the first switch and turn on the second one. Rush to the other room as soon as you turn on the second switch.

If the bulb is glowing, the second switch corresponds to the light bulb; however, if the bulb doesn’t glow, but touching it feels warm, the first switch is the one that turns the bulb on. If it’s neither lit, nor warm, then the third switch is the desired switch. So, a person must go only once to the other room to find out the accurate switch.