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class Item{
    int upTo, quantity;
    void set(int upTo, int quantity) {
        this.upTo = upTo; this.quantity = quantity;
    }
}
class MyComparator implements Comparator<Item>{
    public int compare(Item one, Item two){
        if(one.upTo != two.upTo)
            return one.upTo - two.upTo;
        return 0;
    }
}
 
    public String isFair(int n, int b, int[] upTo, int[] quantity) {
        int q = upTo.length;
        Item[] t = new Item[q+1];
        for(int i = 0; i < q; ++i) {
            t[i] = new Item();
            t[i].set(upTo[i], quantity[i]);
        }
        t[q] = new Item();
        t[q].set(b, n);
        Arrays.sort(t, new MyComparator());
        int prev_upTo = 0, prev_quan = 0;
        String YES = "fair";
        String NO = "unfair";
        int min_even = 0, max_even = 0;
        for(int i = 0; i < q+1; ++i) {
            int even = 0, odd = 0;
            for(int j = prev_upTo + 1; j <= t[i].upTo; ++j) {
                if(j % 2 == 0) ++even;
                else ++odd;
            }
            int quan = t[i].quantity - prev_quan;
            if(quan < 0 || quan > even + odd) return NO;
            prev_upTo = t[i].upTo;
            prev_quan = t[i].quantity;
            min_even += Math.max(0, quan - odd);
            max_even += Math.min(even, quan);
        }
        // System.out.println(min_even + " " + max_even);
        if(min_even <= n/2 && n/2 <= max_even) return YES;
        return NO;
    }
 

prog.cpp:6:1: error: expected ';' after class definition
 }
 ^
prog.cpp: In member function 'void Item::set(int, int)':
prog.cpp:4:14: error: request for member 'upTo' in '(Item*)this', which is of pointer type 'Item*' (maybe you meant to use '->' ?)
         this.upTo = upTo; this.quantity = quantity;
              ^
prog.cpp:4:32: error: request for member 'quantity' in '(Item*)this', which is of pointer type 'Item*' (maybe you meant to use '->' ?)
         this.upTo = upTo; this.quantity = quantity;
                                ^
prog.cpp: At global scope:
prog.cpp:7:31: error: expected initializer before 'Comparator'
 class MyComparator implements Comparator<Item>{
                               ^

Standard output is empty