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Color the ball Problem Description N个气球排成一排，从左到右依次编号为1,2,3....N.每次给定2个整数a b(a <= b),lele便为骑上他的“小飞鸽"牌电动车从气球a开始到气球b依次给每个气球涂一次颜色。但是N次以后lele已经忘记了第I个气球已经涂过 阅读全文
摘要：
Problem E. Matrix from Arrays Problem Description Kazari has an array $A$ length of $L$, she plans to generate an infinite matrix $M$ using $A$.The pr 阅读全文