{"trustable":true,"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":"\u003cdiv class\u003d\"panel_content\"\u003eJohn在X轴上有$n$个点,它们的坐标分别是$(x[i],0),(i\u003d0,1,2,…,n-1)$。他想知道有多少对$\u0026lt;a,b\u0026gt;$满足$|x[b]-x[a]| \\leq k. (a\u0026lt;b)$的条件。\u003c/div\u003e"}},{"title":"输入","value":{"format":"HTML","content":"第一行包含一个整数$T$(大约为5),表示测试用例的数量。\u003cbr\u003e每个测试用例以两个整数$n,k (1 \\leq n \\leq 100000,1 \\leq k \\leq {10}^{9})$开头。\u003cbr\u003e接下来的$n$行包含一个整数$x[i] ({-10}^{9} \\leq x[i] \\leq {10}^{9})$,表示X坐标。"}},{"title":"输出","value":{"format":"HTML","content":"对于每个测试用例,输出一个整数,表示有多少对$\u0026lt;a,b\u0026gt;$满足$|x[b]-x[a]| \\leq k$的条件。"}},{"title":"示例","value":{"format":"HTML","content":"\u003ctable class\u003d\u0027vjudge_sample\u0027\u003e\n\u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eInput\u003c/th\u003e\n \u003cth\u003eOutput\u003c/th\u003e\n \u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003e\u003cpre\u003e2\r\n5 5\r\n-100\r\n0\r\n100\r\n101\r\n102\r\n5 300\r\n-100\r\n0\r\n100\r\n101\r\n102\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e3\r\n10\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e"}}]}