Variables to extract values from vector
p = v [ i ] [ 0 ] [ 0 ] ; NEW_LINE q = v [ i ] [ 0 ] [ 1 ] ; NEW_LINE k = v [ i ] [ 1 ] ; NEW_LINE a [ p ] += k ; NEW_LINE if ( q + 1 <= n ) : NEW_LINE INDENT a [ q + 1 ] -= k ; NEW_LINE DEDENT