{"trustable":false,"prependHtml":"\u003cstyle type\u003d\"text/css\"\u003e\n #problem-body \u003e pre {\n display: block;\n padding: 9.5px;\n margin: 0 0 10px;\n font-size: 13px;\n line-height: 1.42857143;\n word-break: break-all;\n word-wrap: break-word;\n color: #333;\n background: rgba(255, 255, 255, 0.5);\n border: 1px solid #ccc;\n border-radius: 6px;\n }\n\u003c/style\u003e\n","sections":[{"title":"","value":{"format":"HTML","content":"\u003cdiv id\u003d\"problem-body\"\u003e\n\u003cp\u003eGiven two numbers L and R, count how many numbers between L and R(inclusive) that satisfy the following property:\u003cbr\u003e\nThe difference between the sum of digits at even positions and the sum of digits at odd positions is a prime number. The indexing is 1-based and from right to left. In the number 124563: 3 has index 1, 6 has index 2, ..., 1 has index 6. \u003c/p\u003e\n\u003cp\u003e\n For example, diff(20314210) \u003d (1+4+3+2)-(0+2+1+0) \u003d 10-3 \u003d 7, which is a prime number. \u003cbr\u003e\n while \u003cbr\u003e\n diff(234563) \u003d (2+4+6) - (3+5+3) \u003d 12 - 11 \u003d 1, which is not a prime number.\u003c/p\u003e \n\u003ch3\u003eInput\u003c/h3\u003e\n\u003cp\u003eThe first line has number \u0027T\u0027 indicating the number of test cases.\u003c/p\u003e\n\u003cp\u003e\u0027T\u0027 lines follow, each line contains two numbers \u0027L\u0027 and \u0027R\u0027.\u003cbr\u003e\nNOTE:\u0027T\u0027 will be less than 100. \u0027L\u0027 and \u0027R\u0027 will be between 0 and 10^9 inclusive.\u003c/p\u003e\n\u003ch3\u003eOutput\u003c/h3\u003e\n\u003cp\u003eOutput a single line per test case, which is the required count.\u003c/p\u003e\n\u003ch3\u003eExample\u003c/h3\u003e\n\u003cdiv\u003e\u003ctable class\u003d\"vjudge_sample\"\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\u003e5\n200 250\n150 200\n100 150\n50 100\n0 50\n\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e2\n16\n3\n18\n6\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n\u003c/div\u003e"}}]}