Score : $300$ points
Takahashi, who is a novice in competitive programming, wants to learn $M$ algorithms. Initially, his understanding level of each of the $M$ algorithms is $0$.
Takahashi is visiting a bookstore, where he finds $N$ books on algorithms. The $i$-th book ($1\leq i\leq N$) is sold for $C_i$ yen (the currency of Japan). If he buys and reads it, his understanding level of the $j$-th algorithm will increase by $A_{i,j}$ for each $j$ ($1\leq j\leq M$). There is no other way to increase the understanding levels of the algorithms.
Takahashi's objective is to make his understanding levels of all the $M$ algorithms $X$ or higher. Determine whether this objective is achievable. If it is achievable, find the minimum amount of money needed to achieve it.
Input is given from Standard Input in the following format:
$N$ $M$ $X$
$C_1$ $A_{1,1}$ $A_{1,2}$ $\cdots$ $A_{1,M}$
$C_2$ $A_{2,1}$ $A_{2,2}$ $\cdots$ $A_{2,M}$
$\vdots$
$C_N$ $A_{N,1}$ $A_{N,2}$ $\cdots$ $A_{N,M}$
If the objective is not achievable, print -1; otherwise, print the minimum amount of money needed to achieve it.
3 3 10 60 2 2 4 70 8 7 9 50 2 3 9
120
Buying the second and third books makes his understanding levels of all the algorithms $10$ or higher, at the minimum cost possible.
3 3 10 100 3 1 4 100 1 5 9 100 2 6 5
-1
Buying all the books is still not enough to make his understanding levels of all the algorithms $10$ or higher.
8 5 22 100 3 7 5 3 1 164 4 5 2 7 8 334 7 2 7 2 9 234 4 7 2 8 2 541 5 4 3 3 6 235 4 8 6 9 7 394 3 6 1 6 2 872 8 4 3 7 2
1067