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代码说明：

  假定一维整型数组a[n]中的每个元素值均在[0,200]区间内,分别统计出落在[0,20],[20,50],[50,80],[80,130],[130,200]等各区间内的元素个数；(Assume a one-dimensional integer array a [n] each element of the values ​ ​ are in the range [0,200] interval, respectively, the statistics fall [0,20], [20, 50], [50, 80], [, 130] , element number [130,200], etc. of each interval )