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题目：给定一个矩阵matrix，按照之字形打印矩阵。

package com.lcz.leetcode;public class Code_ZigZagMatrix {
   	public static void printMatrixZigZag(int[][] matrix) {
   		int tR = 0;		int tC = 0;		int dR = 0;		int dC = 0;		int endR = matrix.length-1;		int endC = matrix[0].length-1;		boolean fromUp = false;		while(tR!=endR+1) {
   			printLevel(matrix,tR,tC,dR,dC,fromUp);			tR = tC==endC?tR+1:tR;			tC = tC==endC?tC:tC+1;			dC = dR==endR?dC+1:dC;			dR = dR==endR?dR:dR+1;			fromUp = !fromUp;		}		System.out.println();	}		public static void printLevel(int[][] m,int tR,int tC,int dR,int dC,boolean f) {
   		if(f) {
   			while(tR!=dR+1) {
   				System.out.print(m[tR++][tC--] + " ");			}		}else {
   			while(dR!=tR-1) {
   				System.out.print(m[dR--][dC++] + " ");			}		}	}		public static void main(String[] args) {
   		int[][] matrix = {
   {
   1,2,3,4},{
   5,6,7,8},{
   9,10,11,12},{
   13,14,15,16}};		printMatrixZigZag(matrix);	}}

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