{"trustable":false,"prependHtml":"\u003cstyle type\u003d\"text/css\"\u003e\n section 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\u003cscript\u003e\n window.katexOptions \u003d {\n delimiters: [\n {left: \u0027\\\\(\u0027, right: \u0027\\\\)\u0027, display: false},\n {left: \u0027\\\\[\u0027, right: \u0027\\\\]\u0027, display: true}\n ]\n };\n\u003c/script\u003e\n","sections":[{"title":"Problem Statement","value":{"format":"HTML","content":"计算1-N之间有多少整数的 非零位数量恰好为K"}},{"title":"Constraints","value":{"format":"HTML","content":"\u003csection\u003e \n \u003cul\u003e \n \u003cli\u003e\u003cvar\u003e\\(1 \\leq N \u0026lt; 10^{100}\\)\u003c/var\u003e\u003c/li\u003e \n \u003cli\u003e\u003cvar\u003e\\(1 \\leq K \\leq 3\\)\u003c/var\u003e\u003c/li\u003e \n \u003c/ul\u003e \n\u003c/section\u003e"}},{"title":"Input","value":{"format":"HTML","content":"\u003csection\u003e \n \u003cp\u003e输入格式如下:\u003c/p\u003e \n \u003cpre\u003e\u003cvar\u003e\\(N\\)\u003c/var\u003e\n\u003cvar\u003e\\(K\\)\u003c/var\u003e\n\u003c/pre\u003e \n\u003c/section\u003e"}},{"title":"Output","value":{"format":"HTML","content":"\u003csection\u003e \n \u003cp\u003e输出一个整数表示数量.\u003c/p\u003e \n\u003c/section\u003e"}},{"title":"Sample 1","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\u003e100\n1\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e19\n\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n\u003csection\u003e \n\u003c/section\u003e\u003csection\u003e \n \u003cp\u003e下面的 \u003cvar\u003e\\(19\\)\u003c/var\u003e 个整数满足条件:\u003c/p\u003e \n \u003cul\u003e \n \u003cli\u003e\u003cvar\u003e\\(1,2,3,4,5,6,7,8,9,10,20,30,40,50,60,70,80,90,100\\)\u003c/var\u003e\u003c/li\u003e \n \u003c/ul\u003e \n\u003c/section\u003e"}},{"title":"Sample 2","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\u003e25\n2\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e14\n\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n\u003csection\u003e \n\u003c/section\u003e\u003csection\u003e \n \u003cp\u003e下面的 \u003cvar\u003e\\(14\\)\u003c/var\u003e 个整数满足条件:\u003c/p\u003e \n \u003cul\u003e \n \u003cli\u003e\u003cvar\u003e\\(11,12,13,14,15,16,17,18,19,21,22,23,24,25\\)\u003c/var\u003e\u003c/li\u003e \n \u003c/ul\u003e \n\u003c/section\u003e"}}]}