{"id":20689,"date":"2022-11-10T13:13:16","date_gmt":"2022-11-10T07:43:16","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-c-vector-matching-closed\/"},"modified":"2022-11-10T13:13:16","modified_gmt":"2022-11-10T07:43:16","slug":"solved-c-vector-matching-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-c-vector-matching-closed\/","title":{"rendered":"[Solved] C++ vector matching [closed]"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-23854772\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"23854772\" data-parentid=\"23854750\" 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>You code has <strong>undefined behavior<\/strong> because you are accessing them beyond the size. In <code>v1<\/code> there will be 7 items, while in <code>v2<\/code>, there will be 3. But you are accessing both upto index 20. So the output can be <em>anything<\/em>.<\/p>\n<p>To avoid this, you can <code>resize<\/code> your vectors and then assign <code>1<\/code> to specified indexes.<\/p>\n<pre><code>v1.resize(N); \/\/ keep enough space\nv2.resize(N);\n\n\nfor(int i = 0; i &lt; N; i+=3) {\n v1[i]=1;\n}\nfor(int i = 0; i &lt; N; i+=7) {\n v2[i]=1;\n}\nfor(int i = 0; i &lt; N; ++i) {\n if(v1[i] == 1 &amp;&amp; v2[i] == 1) count++;\n}\n<\/code><\/pre>\n<p>Another problem is your loop conditions are <code>i&lt;=N<\/code>, which should be <code>i&lt;N<\/code>. <code>vector<\/code> has zero based index.<\/p>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">0<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved C++ vector matching [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] You code has undefined behavior because you are accessing them beyond the size. In v1 there will be 7 items, while in v2, there will be 3. But you are accessing both upto index 20. So the output can be anything. To avoid this, you can resize your vectors and then assign 1 to &#8230; <a title=\"[Solved] C++ vector matching [closed]\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-c-vector-matching-closed\/\" aria-label=\"More on [Solved] C++ vector matching [closed]\">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],"class_list":["post-20689","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] C++ vector matching [closed] - 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-c-vector-matching-closed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] C++ vector matching [closed] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] You code has undefined behavior because you are accessing them beyond the size. In v1 there will be 7 items, while in v2, there will be 3. But you are accessing both upto index 20. So the output can be anything. To avoid this, you can resize your vectors and then assign 1 to ... 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