Diwali Lights

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Problem Description It's Diwali time and Deep has bought a special light. The light consists of a rectangular grid of N rows (R1 to RN) and M columns (C1 to CM). Each cell of the grid has a bulb. All the bulbs in the same column C[i] (1 Deep wants to save electricity, so he decides to glow only one bulb from each row. His superstitious roommate Sandip suggests that he should light bulbs in suc

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