The problem:
cin>> leaves the newline character (\n) in the iostream. If getline is used after cin>>, the getline sees this newline character as leading whitespace, thinks it is finished and stops reading any further.
Reference：
http://mathbits.com/mathbits/compsci/APstrings/APgetline.htm (英文原文)
http://csie-tw.blogspot.tw/2007/10/cin-getlinecin-s.html (藏經閣，中文)
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