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I haven't used vectors in this way before. I know it works, but I don't understand it. Why are you subtracting character 'a' in lines: freq[a[i]-'a']+=1; and freq[b[i]-'a']-=1;?
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Strings: Making Anagrams
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I haven't used vectors in this way before. I know it works, but I don't understand it. Why are you subtracting character 'a' in lines: freq[a[i]-'a']+=1; and freq[b[i]-'a']-=1;?