{"trustable":false,"sections":[{"title":"QDU2021","value":{"format":"MD","content":"\u003cscript type\u003d\"text/x-mathjax-config\"\u003e\nMathJax.Hub.Config({\n tex2jax: {inlineMath: [[\u0027$$$\u0027,\u0027$$$\u0027], [\u0027$\u0027,\u0027$\u0027]], displayMath: [[\u0027$$$$$$\u0027,\u0027$$$$$$\u0027], [\u0027$$\u0027,\u0027$$\u0027]]}\n});\n\u003c/script\u003e\n\u003cscript type\u003d\"text/javascript\" async\n src\u003d\"https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config\u003dTeX-AMS-MML_HTMLorMML\"\u003e\n\u003c/script\u003e\n\n小羊驼在玩写数字的游戏,他依次写下 **m** 到 **n** 的所有十进制整数,他现在想知道在这个过程中他写了多少个 **0** "}},{"title":"Input","value":{"format":"MD","content":"Input starts with an integer **T (\u0026le; 11000)**, denoting the number of test cases.\n\nEach case contains two unsigned 32-bit integers **m** and **n, (m \u0026le; n)**."}},{"title":"Output","value":{"format":"MD","content":"对于每组样例,输出样例编号和他写下的 **0** 的个数"}},{"title":"Sample Input","value":{"format":"MD","content":"\u003cpre\u003e5\n10 11\n0 217\n123 114514\n0 19260817\n233 233333333\u003c/pre\u003e"}},{"title":"Sample Output","value":{"format":"MD","content":"\u003cpre\u003eCase 1: 1\nCase 2: 42\nCase 3: 55279\nCase 4: 12523980\nCase 5: 182962920\u003c/pre\u003e"}}]}