{"id":11888,"date":"2022-09-28T22:38:12","date_gmt":"2022-09-28T17:08:12","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-unique-random-number-between-0-and-9\/"},"modified":"2022-09-28T22:38:12","modified_gmt":"2022-09-28T17:08:12","slug":"solved-unique-random-number-between-0-and-9","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-unique-random-number-between-0-and-9\/","title":{"rendered":"[Solved] Unique Random Number between 0 and 9"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-41841513\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"41841513\" data-parentid=\"41841057\" data-score=\"1\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>I prefer to use shuffle.<\/p>\n<pre><code>#include &lt;algorithm&gt;\n#include &lt;iostream&gt;\n#include &lt;random&gt;\n#include &lt;vector&gt;\n#include &lt;cassert&gt;\n\nclass T455_t\n{\nprivate:\n   \/\/ data\n   std::vector&lt;int&gt; m_iVec ;\n\npublic:\n   T455_t() {}\n\n   int exec()\n      {\n         std::vector&lt;int&gt; iVec;\n\n         gen10();\n\n         for (int i=0; i&lt;10; ++i)\n         {\n            int nxtRandom = uniqueRandomInt();\n            std::cout &lt;&lt; nxtRandom &lt;&lt; std::endl;\n         }\n         return(0);\n      }\n\n\nprivate: \/\/ methods\n\n   void gen10() \/\/ fills data attribute with 10 digits\n      {\n         for (int i=0; i&lt;=9; ++i)\n            m_iVec.push_back(i);\n\n         std::random_device rd;\n         std::mt19937_64 gen(rd());\n         std::shuffle (m_iVec.begin(), m_iVec.end(), gen);\n         \/\/ m_iVec now contains 10 unique numbers, \n         \/\/ range 0..9, in random order\n      }\n\n   int uniqueRandomInt()\n      {\n         assert(m_iVec.size());\n         int retVal = m_iVec.back(); \/\/ gets last element in vector\n         m_iVec.pop_back();          \/\/ removes last element\n         return(retVal);\n      }\n\n}; \/\/ class T455_t\n\n\nint main(int argc, char* argv[])\n{\n   setlocale(LC_ALL, \"\");\n   std::ios::sync_with_stdio(false);\n\n   std::chrono::high_resolution_clock::time_point  m_start_us =\n      std::chrono::high_resolution_clock::now();\n\n   int retVal = -1;\n   {\n      T455_t   t455;\n      retVal = t455.exec();\n   }\n\n   std::chrono::microseconds  chrono_duration_us =\n      std::chrono::duration_cast &lt;std::chrono::microseconds&gt;\n      (std::chrono::high_resolution_clock::now() - m_start_us);\n\n   std::cout &lt;&lt; \"  FINI   \" &lt;&lt; chrono_duration_us.count() \n             &lt;&lt; \" us\" &lt;&lt; std::endl;\n   return(retVal);\n}\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">2<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Unique Random Number between 0 and 9 <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] I prefer to use shuffle. #include &lt;algorithm&gt; #include &lt;iostream&gt; #include &lt;random&gt; #include &lt;vector&gt; #include &lt;cassert&gt; class T455_t { private: \/\/ data std::vector&lt;int&gt; m_iVec ; public: T455_t() {} int exec() { std::vector&lt;int&gt; iVec; gen10(); for (int i=0; i&lt;10; ++i) { int nxtRandom = uniqueRandomInt(); std::cout &lt;&lt; nxtRandom &lt;&lt; std::endl; } return(0); } private: \/\/ methods &#8230; <a title=\"[Solved] Unique Random Number between 0 and 9\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-unique-random-number-between-0-and-9\/\" aria-label=\"More on [Solved] Unique Random Number between 0 and 9\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[324,1014],"class_list":["post-11888","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-random"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Unique Random Number between 0 and 9 - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-unique-random-number-between-0-and-9\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Unique Random Number between 0 and 9 - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] I prefer to use shuffle. #include &lt;algorithm&gt; #include &lt;iostream&gt; #include &lt;random&gt; #include &lt;vector&gt; #include &lt;cassert&gt; class T455_t { private: \/\/ data std::vector&lt;int&gt; m_iVec ; public: T455_t() {} int exec() { std::vector&lt;int&gt; iVec; gen10(); for (int i=0; i&lt;10; ++i) { int nxtRandom = uniqueRandomInt(); std::cout &lt;&lt; nxtRandom &lt;&lt; std::endl; } return(0); } private: \/\/ methods ... 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#include &lt;iostream&gt; #include &lt;random&gt; #include &lt;vector&gt; #include &lt;cassert&gt; class T455_t { private: \/\/ data std::vector&lt;int&gt; m_iVec ; public: T455_t() {} int exec() { std::vector&lt;int&gt; iVec; gen10(); for (int i=0; i&lt;10; ++i) { int nxtRandom = uniqueRandomInt(); std::cout &lt;&lt; nxtRandom &lt;&lt; std::endl; } return(0); } private: \/\/ methods ... 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