I was solving subarray problems the other day and came up with the above problem. I searched it online. I just wanted to solve it and submitted it to a judge. But I could not find such a problem. Do you guys happen to have encounter such a problem somewhere?
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This problem is the same concept you want. You need to find subarray where even appears odd no time but in this problem you have to find odd number appears odd number of time because odd number appeared odd times so the sum is odd