{"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 has $n$ points on the X axis, and their coordinates are $(x[i],0),(i\u003d0,1,2,…,n-1)$. He wants to know how many pairs$\u0026lt;a,b\u0026gt;$ that $|x[b]-x[a]| \\leq k. (a\u0026lt;b)$\u003c/div\u003e"}},{"title":"Input","value":{"format":"HTML","content":"The first line contains a single integer $T$ (about 5), indicating the number of cases.\u003cbr\u003eEach test case begins with two integers $n,k (1 \\leq n \\leq 100000,1 \\leq k \\leq {10}^{9})$.\u003cbr\u003eNext $n$ lines contain an integer $x[i] ({-10}^{9} \\leq x[i] \\leq {10}^{9})$, means the X coordinates."}},{"title":"Output","value":{"format":"HTML","content":"For each case, output an integer means how many pairs$\u0026lt;a,b\u0026gt;$ that $|x[b]-x[a]| \\leq k$."}},{"title":"Sample","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\n"}}]}