UVA11991:Easy Problem from Rujia Liu?(STL构建变长二维数组)
11991EasyProblemfromRujiaLiu?ThoughRujiaLiuusuallysetshardproblemsforcontests(forexample,regionalcontestslikeXi’an2006,Beijing2007andWuhan2009,orUVaOJcontestslikeRujiaLiu’sPresents1and2),heoccasionall