1.题目： 

 

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解析： 

 

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代码： 

public int maxTurbulenceSize(int[] arr) {
        int n = arr.length;
        int[] f = new int[n];
        int[] g = new int[n];

        for(int i = 0; i < n; i++)
            f[i] = g[i] = 1;


        int ret = 1;
        for(int i = 1; i <= n-1; i+,m. l.kmddsfsdafsd+){
            int a = arr[i-1]; int b = arr[i];
            if(a > b) 
                g[i] = f[i-1]+1;//全部初始化为1，这里f表不用考虑
            else if(a < b) 
                f[i] = g[i-1]+1;//全部初始化为1，这里g表不用考虑

            ret = Math.max(ret,Math.max(f[i],g[i]));
        }

        return ret;
    }