{"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":"PLAIN","content":"Đếm số số nguyên dương \u003c\u003d N có đúng K chữ số khác không."}},{"title":"Constraints","value":{"format":"PLAIN","content":"N \u003c 10^100\nK \u003c\u003d 3"}},{"title":"Input","value":{"format":"PLAIN","content":"N\nK"}},{"title":"Sample Input 1","value":{"format":"PLAIN","content":"100\n1\n"}},{"title":"Sample Output 1","value":{"format":"PLAIN","content":"19\n"}},{"title":"Sample Input 2","value":{"format":"PLAIN","content":"25\n2\n"}},{"title":"Sample Output 2","value":{"format":"PLAIN","content":"14\n"}},{"title":"Sample Input 3","value":{"format":"PLAIN","content":"314159\n2\n"}},{"title":"Sample Output 3","value":{"format":"PLAIN","content":"937\n"}},{"title":"Sample Input 4","value":{"format":"PLAIN","content":"9999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999\n3\n"}},{"title":"Sample Output 4","value":{"format":"PLAIN","content":"117879300\n"}}]}