package main

import (
	"fmt"
	"bufio"
	"os"
	"strconv"
)

//=====I/O=====

var (
	sc = bufio.NewScanner(os.Stdin)
	wr = bufio.NewWriter(os.Stdout)
)

func scanInt() int {
	sc.Scan()
	a,_ := strconv.Atoi(sc.Text())
	return a
}

func scanInt64() int64 {
	sc.Scan()
	a,_ := strconv.ParseInt(sc.Text(),10,64)
	return a
}

func scanInts(n int) []int {
	res := make([]int, n)
	for i := 0; i < n; i++ { res[i] = scanInt() }
	return res
}

func scanText() string {
	sc.Scan()
	return sc.Text()
}

func printInts(a ...int) {
	for i, e := range a {
		fmt.Fprint(wr, e)
		if i != len(a)-1 { fmt.Fprint(wr, " ") }
	}
	fmt.Fprintln(wr)
	wr.Flush()
}

//=====main=====

func main() {
	sc.Split(bufio.ScanWords)

	t := scanInt()

	for i := 0; i < t; i++ {
		a,b,c := scanInt(), scanInt(), scanInt()

		f := 0
		if a==c {
			f++
			c--
		}

		if c<1 {
			fmt.Println(-1)
			continue
		}

		val := -1

		if b>2 {
			val1 := 0
			if a-b >= 0 {
				val1 = a-b+1
			}
			if c-b >= 0 {
				val1+=c-b+1
			}
			if a-b+1 >= 0&&c-b+1 >= 0 {
				val1++
			}
			val = val1
		}

		if min(a,c)>1 {
			val2 := max(max(b-a,0),max(b-c,0))+1
			if b-a<0&&b-c<0 {
				val2--
			}
			if val<0 {
				val = val2
			} else {
				val = min(val,val2)
			}
		}

		if val<0 {
			fmt.Println(-1)
		} else {
			fmt.Println(f+val)
		}

	}

}

func abs(a int) int {
	if a<0 {
		return -a
	}
	return a
}

func min(a ...int) int {
	res := a[0]
	for i := 1; i < len(a); i++ {
		if res > a[i] { res = a[i] }
	}
	return res
}

func max(a ...int) int {
	res := a[0]
	for i := 1; i < len(a); i++ {
		if res < a[i] { res = a[i] }
	}
	return res
}