Color Difference

A flower shop has $N$ flowers for sale. These flowers are arranged in a row from left to right. The $i$-th flower has color $C_i$. You would like to buy some contiguous range of these flowers. Specifically, you've shortlisted $M$ ranges of flowers. The $i$-th range starts at index $L_i$ and ends at index $R_i$, and includes both endpoints. For two ranges $i$ and $j$ ($1 \leq i, j \leq M$)