John has collected various rocks. Each rock has various minerals embeded in it. Each type of mineral is designated by a lowercase letter in the range . There may be multiple occurrences of a mineral in a rock. A mineral is called a gemstone if it occurs at
Added by Raymond A.
Step 1
Let's denote the number of rocks John has collected as $n$. Let $R_i$ be the set of minerals in the $i$-th rock, where $1 \leq i \leq n$. We want to find the number of gemstones, which are the minerals that occur in all the rocks. Show more…
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