use std::cmp::{max, min};
use std::io::Read;

fn solve(abcs: Vec<Vec<usize>>) {
    abcs.iter().for_each(|abc| {
        let a = abc[0];
        let b = abc[1];
        let c = abc[2];
        let max_ac = max(a, c);
        let min_ac = min(a, c);
        if max_ac < b || min_ac > b {
            if max_ac == min_ac {
                // a = c = 1
                if a == 1 {
                    println!("{}", -1);
                // c - 1 = b
                } else if min_ac > b && min_ac - b == 1 {
                    if b > 1 {
                        println!("{}", 2);
                    } else {
                        println!("{}", -1);
                    }
                } else {
                    println!("{}", 1);
                }
            } else {
                println!("{}", 0);
            }
        // a = b = c
        } else if a == c {
            if a >= 3 {
                println!("{}", 3);
            } else {
                println!("{}", -1);
            }
        // ex.) a > b = c
        } else if min_ac == b {
            if b >= 2 {
                println!("{}", 1);
            } else {
                println!("{}", -1);
            }
        // ex.) a = b > c
        } else if max_ac == b {
            if b - min_ac > 1 {
                println!("{}", 1);
            } else {
                if min_ac > 1 {
                    println!("{}", 2);
                } else {
                    println!("{}", -1);
                }
            }
        // ex.) a > b > c
        } else {
            let a2b = max_ac - b + 1;
            let b2c = b - min_ac + 1;
            if min_ac == 1 {
                if b == 2 {
                    println!("{}", -1);
                } else {
                    println!("{}", a2b);
                }
            } else {
                println!("{}", min(a2b, b2c));
            }
        }
    });
}

fn main() {
    let mut all_data = String::new();
    std::io::stdin().read_to_string(&mut all_data).ok();
    let all_data: Vec<&str> = all_data.trim().split('\n').map(|a| a.trim()).collect();
    let t: usize = all_data.iter().next().unwrap().trim().parse::<usize>().unwrap();
    let abc: Vec<Vec<usize>> = all_data.iter().skip(1).take(t)
        .map(|a| a.split_whitespace().map(|i| i.parse::<usize>().unwrap()).collect::<Vec<usize>>())
        .collect();
    solve(abc);
}