(charFrequencyMap.find(rightChar) != charFrequencyMap.end())
in c++ reference
“Notice that an unordered_map object makes no guarantees on which order its elements follow. But, in any case, the range that goes from its begin to its end covers all the elements in the container (or the bucket), until invalidated”
How can we rely on a random result and what does this check give us ?
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