@ Dumanshu: With memory restriction also XOR method works.. :) In this case difference is just that you will be working with 40000000000/ X number of files..where X is size of the RAM...just maintain a variable Curr_XOR_value and go on XORing it with element read from the file. When you are done with reading all those numbers from "40000000000/ X" files.. (Curr_XOR_value) * XOR* (expected_XOR_value for 1 to 40000000000) ... will give missing number...
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