983. Minimum Cost For Tickets
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You have planned some train traveling one year in advance. The days of the year in which you will travel are given as an integer array `days`. Each day is an integer from `1` to `365`.

Train tickets are sold in three different ways:

• a 1-day pass is sold for `costs` dollars,
• a 7-day pass is sold for `costs` dollars, and
• a 30-day pass is sold for `costs` dollars.

The passes allow that many days of consecutive travel.

• For example, if we get a 7-day pass on day `2`, then we can travel for `7` days: `2`, `3`, `4`, `5`, `6`, `7`, and `8`.

Return the minimum number of dollars you need to travel every day in the given list of days.

Example 1:

```Input: days = [1,4,6,7,8,20], costs = [2,7,15]
Output: 11
Explanation: For example, here is one way to buy passes that lets you travel your travel plan:
On day 1, you bought a 1-day pass for costs = \$2, which covered day 1.
On day 3, you bought a 7-day pass for costs = \$7, which covered days 3, 4, ..., 9.
On day 20, you bought a 1-day pass for costs = \$2, which covered day 20.
In total, you spent \$11 and covered all the days of your travel.
```

Example 2:

```Input: days = [1,2,3,4,5,6,7,8,9,10,30,31], costs = [2,7,15]
Output: 17
Explanation: For example, here is one way to buy passes that lets you travel your travel plan:
On day 1, you bought a 30-day pass for costs = \$15 which covered days 1, 2, ..., 30.
On day 31, you bought a 1-day pass for costs = \$2 which covered day 31.
In total, you spent \$17 and covered all the days of your travel.
```

Constraints:

• `1 <= days.length <= 365`
• `1 <= days[i] <= 365`
• `days` is in strictly increasing order.
• `costs.length == 3`
• `1 <= costs[i] <= 1000`
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