{"trustable":false,"prependHtml":"\u003cscript\u003e window.katexOptions \u003d { disable: true }; \u003c/script\u003e\n\u003cscript type\u003d\"text/x-mathjax-config\"\u003e\n MathJax.Hub.Config({\n tex2jax: {\n inlineMath: [[\u0027$$$\u0027,\u0027$$$\u0027], [\u0027$\u0027,\u0027$\u0027]],\n displayMath: [[\u0027$$$$$$\u0027,\u0027$$$$$$\u0027], [\u0027$$\u0027,\u0027$$\u0027]]\n }\n });\n\u003c/script\u003e\n\u003cscript async src\u003d\"https://mathjax.codeforces.org/MathJax.js?config\u003dTeX-AMS-MML_HTMLorMML\" type\u003d\"text/javascript\"\u003e\u003c/script\u003e","sections":[{"title":"","value":{"format":"HTML","content":"有N (N ≥ 3)只兔子在河边玩耍,他们在一条直线上玩,每只兔子都占一个整数的位置。移动时,任意一只兔子可以跳到其他两只兔子之间。两只兔子不会占据同一个位置,问这些兔子最多可以移动多少次。\n\u003c/div\u003e"}},{"title":"Input","value":{"format":"HTML","content":"输入的第一行是一个数t (1 ≤ t ≤ 500),代表有t组样例。\u003cbr\u003e\n每组样例的第一行包含一个整数 N (3 ≤ N ≤ 500) ,第二行包含N个整数,代表每只兔子的位置x, 1 ≤ x ≤ 10000.\n"}},{"title":"Output","value":{"format":"HTML","content":"对于每组样例,输出可以移动的最大次数。\n\u003cbr\u003e"}},{"title":"Sample Input","value":{"format":"HTML","content":"\u003cpre\u003e5\n3\n3 4 6\n3\n2 3 5\n3\n3 5 9\n4\n1 2 3 4\n4\n1 2 4 5\u003c/pre\u003e"}},{"title":"Sample Output","value":{"format":"HTML","content":"\u003cpre\u003e1\n1\n3\n0\n1\u003c/pre\u003e"}}]}