import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main {
	public static void main(String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int t = Integer.parseInt(br.readLine());
		for (int i = 0; i < t; i++) {
			String[] sa = br.readLine().split(" ");
			long a = Integer.parseInt(sa[0]);
			long b = Integer.parseInt(sa[1]);
			long c = Integer.parseInt(sa[2]);
			long ans = Long.MAX_VALUE;
			if (b > a) {
				if (b == c) {
					ans = 1;
					c--;
					if (a == c) {
						if (a == 1) {
							ans = -1;
						} else {
							ans++;
						}
					}
				} else if (b > c) {
					if (a == c) {
						if (a == 1) {
							ans = -1;
						} else {
							ans = 1;
						}
					} else {
						ans = 0;
					}
				} else {
					if (c - b < b - a || a == 1) {
						ans = c - b + 1;
						c = b - 1;
						if (a == c) {
							if (a == 1) {
								ans = -1;
							} else {
								ans++;
							}
						}
					} else {
						ans = b - a + 1;
					}
				}
			} else if (b == a) {
				if (b == c) {
					if (a <= 2) {
						ans = -1;
					} else {
						ans = 3;
					}
				} else if (b == c + 1) {
					if (c == 1) {
						ans = -1;
					} else {
						ans = 2;
					}
				} else {
					if (a == 1) {
						ans = -1;
					} else {
						ans = 1;
					}
				}
			} else {
				// a > b
				if (b == c) {
					if (c == 1) {
						ans = -1;
					} else {
						ans = 1;
					}
				} else if (b > c) {
					if (a - b < b - c || c == 1) {
						ans = a - b + 1;
						a = b - 1;
						if (a == c) {
							if (c == 1) {
								ans = -1;
							} else {
								ans++;
							}
						}
					} else {
						ans = b - c + 1;
					}
				} else {
					if (a == c) {
						if (a == 2 && b == 1) {
							ans = -1;
						} else {
							ans = 1;
						}
					} else {
						ans = 0;
					}
				}
			}
			System.out.println(ans);
		}
		br.close();
	}
}