Add `decode qp problem`

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 88.56%. Comparing base (57e44cf) to head (e06d72d). Report is 4 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #634 +/- ## ========================================== + Coverage 88.49% 88.56% +0.06% ========================================== Files 42 42 Lines 4539 4565 +26 ========================================== + Hits 4017 4043 +26 Misses 522 522 ```

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