Columbus and Power Arrows

Now, After killing the zombie our heroes are going further towards their home. Meanwhile going to the home they had found $N$ arrows. The power of those arrows is given to them in the form $a[1], a[2], ……, a[N]$. And they are carrying a dairy in which m pairs of powers are written they call it victorious pairs of power. It is written in the form of $(i_1, j_1), (i_2, j_2), ...,  (i_m, j _m)$. Eac