The structure array Xy has two elements, namely xy[0] and xy[ 1], and each value of the two structures contains two plastic data, so its initialization needs four plastic values. Given 1, 2,3,4,xy [0]. m，xy[0]。 n，xy[ 1]。 m，xy[ 1]。 N pay in sequence.

So there is xy [0]. m = 1，xy [ 1]。 n = 4。