Longest Increasing Continuous subsequence II

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1. 不能赋初始值，因为dp[0][0]有可能成为终点，走的方向是上下左右。
2. 实现的时候在search函数里面，要把求得的值赋给dp[x][y]。因为如果在search里面调用search，"res=Math.max(res,search(newx,newy,A)+1);",这里求得的结果其实是dp[x][y],如果不赋值给dp[x][y]，那么就白调用了。

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