Remove Duplicates from Sorted Array II

问题：消除数组中重复次数超过三次的多余的数
分析：若ai-1==ai-2若ai也相等，则清楚ai

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class Solution { public:     int removeDuplicates(int A[], int n) {         int i,j;         for(i=2;i<n;i++)         {             if(A[i-2]==A[i-1])             {                 if(A[i]==A[i-1])                 {                     for(j=i;j<n-1;j++) A[j]=A[j+1];                     n--;                     i--;                 }             }         }         return n;     } };