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  • thanks buddy, the logic of 'cumsum' was beyond of my knowledge, I am still figuring out like how it perform such magic Commented Mar 10, 2018 at 11:08
  • @Vineet Just break it down. I added an example Commented Mar 10, 2018 at 11:15
  • the last one also giving result, please help me to understand the issue in that Commented Mar 10, 2018 at 12:24