Farmer John's N cows, conveniently numbered 1…N, are all standing in a row (they seem to do so often that it now takes very little prompting from Farmer John to line them up). Each cow has a breed ID: 1 for Holsteins, 2 for Guernseys, and 3 for Jerseys. Farmer John would like your help counting the number of cows of each breed that lie within certain intervals of the ordering.
给定一个长度为N的序列,每个位置上的数只可能是1,2,3中的一种。
有Q次询问,每次给定两个数a,b,请分别输出区间[a,b]里数字1,2,3的个数。