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s.erase(unique(s.begin(), s.end()), s.end()); ........................s.erase(s.begin());............. why we have to write two time erase() ??
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Pangrams
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s.erase(unique(s.begin(), s.end()), s.end()); ........................s.erase(s.begin());............. why we have to write two time erase() ??