Love Feels Odd

Chef is willing to do anything to impress Chefina. She has prepared a test for him, to see how much of a problem-solver he is that he claims to be. Chefina only likes the numbers that appear for an odd number of times in the index range $[L,R]$, where $1 \leq L \leq R \leq N$, and she wants Chef to find out how many numbers there are that she doesn't like. She gives him an integer array $A$ of le