The problem statement is asking to find all the distinct non-empty strings that can be formed from a given string such that no two adjacent characters from the original string are chosen in the new string. The answer can be large so it should be printed modulo 109+7.

Here is a step-by-step solution:

1. Initialize two variables, `prev` and `curr`, to keep track of the number of distinct strings that can be formed using the characters up to the current position. Set `prev` to 1 and `curr` to 2 (since a string of length 1 can form 2 distinct strings: the string itself and an empty string).

2. Iterate over the characters in the string from the second character to the end. For each character, calculate the new `curr` as the sum of the current `curr` and `prev`, modulo 109+7. This is because the number of distinct strings that can be formed using the characters up to the current position is the sum of the number of distinct strings that can be formed using the characters up to the previous position (since we can choose not to use the current character) and the number of distinct strings that can be formed using the characters up to the position before the previous position (since we can choose to use the current character, but then we cannot use the previous character). Then, update `prev` to the old `curr`.

3. After the loop, `curr` is the total number of distinct strings that can be formed using the characters in the string. However, this includes the empty string, which is not considered a valid string according to the problem statement. Therefore, subtract 1 from `curr` to exclude the empty string.

4. Finally, return `curr` modulo 109+7 to ensure that the result fits within the required range.

Here is a Python solution based on the above steps:

```python
def count_strings(s):
MOD = 10**9 + 7
prev, curr = 1, 2
for i in range(1, len(s)):
prev, curr = curr, (prev + curr) % MOD
return (curr -

Question

The problem statement is asking to find all the distinct non-empty strings that can be formed from a given string such that no two adjacent characters from the original string are chosen in the new string. The answer can be large so it should be printed modulo 109+7.

Here is a step-by-step solution:

1. Initialize two variables, `prev` and `curr`, to keep track of the number of distinct strings that can be formed using the characters up to the current position. Set `prev` to 1 and `curr` to 2 (since a string of length 1 can form 2 distinct strings: the string itself and an empty string).

2. Iterate over the characters in the string from the second character to the end. For each character, calculate the new `curr` as the sum of the current `curr` and `prev`, modulo 109+7. This is because the number of distinct strings that can be formed using the characters up to the current position is the sum of the number of distinct strings that can be formed using the characters up to the previous position (since we can choose not to use the current character) and the number of distinct strings that can be formed using the characters up to the position before the previous position (since we can choose to use the current character, but then we cannot use the previous character). Then, update `prev` to the old `curr`.

3. After the loop, `curr` is the total number of distinct strings that can be formed using the characters in the string. However, this includes the empty string, which is not considered a valid string according to the problem statement. Therefore, subtract 1 from `curr` to exclude the empty string.

4. Finally, return `curr` modulo 109+7 to ensure that the result fits within the required range.

Here is a Python solution based on the above steps:

```python
def count_strings(s):
    MOD = 10**9 + 7
    prev, curr = 1, 2
    for i in range(1, len(s)):
        prev, curr = curr, (prev + curr) % MOD
    return (curr -

Knowee AI · Accepted Answer

The problem statement is asking to find all the distinct non-empty strings that can be formed from a given string such that no two adjacent characters from the original string are chosen in the new string. The answer can be large so it should be printed modulo 109+7.

Here is a step-by-step solution:

1. Initialize two variables, `prev` and `curr`, to keep track of the number of distinct strings that can be formed using the characters up to the current position. Set `prev` to 1 and `curr` to 2 (since a string of length 1 can form 2 distinct strings: the string itself and an empty string).

2. Iterate over the characters in the string from the second character to the end. For each character, calculate the new `curr` as the sum of the current `curr` and `prev`, modulo 109+7. This is because the number of distinct strings that can be formed using the characters up to the current position is the sum of the number of distinct strings that can be formed using the characters up to the previous position (since we can choose not to use the current character) and the number of distinct strings that can be formed using the characters up to the position before the previous position (since we can choose to use the current character, but then we cannot use the previous character). Then, update `prev` to the old `curr`.

3. After the loop, `curr` is the total number of distinct strings that can be formed using the characters in the string. However, this includes the empty string, which is not considered a valid string according to the problem statement. Therefore, subtract 1 from `curr` to exclude the empty string.

4. Finally, return `curr` modulo 109+7 to ensure that the result fits within the required range.

Here is a Python solution based on the above steps:

```python
def count_strings(s):
    MOD = 10**9 + 7
    prev, curr = 1, 2
    for i in range(1, len(s)):
        prev, curr = curr, (prev + curr) % MOD
    return (curr -

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