void merge(int* A, int ALen, int m, int* B, int BLen, int n)
{
int i = m - 1, j = n - 1, k = m + n -1;
while(i >= 0 && j >= 0)
{
if(A[i] > B[j])
A[k--] = A[i--];
else
A[k--] = B[j--];
}
while(j >= 0)
A[k--] = B[j--];
}

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