Dotify Playlist

You use the Dotify app to store and play your favorite songs. You have a total of $N$ different songs in the app, numbered from $1$ to $N$. The $i^{th}$ song is $M_i$ minutes long, and is in the language $L_i$. You are going on a long drive, and your friend only knows the language $L$. So you want to create a playlist which satisfies these conditions: - There should be exactly $K$ songs in the p