{"id":12613,"date":"2022-10-01T07:31:09","date_gmt":"2022-10-01T02:01:09","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-how-to-determine-whether-a-value-exists-in-map-in-c\/"},"modified":"2022-10-01T07:31:09","modified_gmt":"2022-10-01T02:01:09","slug":"solved-how-to-determine-whether-a-value-exists-in-map-in-c","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-how-to-determine-whether-a-value-exists-in-map-in-c\/","title":{"rendered":"[Solved] How to determine whether a value exists in map in C++"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-53450733\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"53450733\" data-parentid=\"53450604\" 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<blockquote>\n<p>Q1: How to check if a value exists in hashmap?<\/p>\n<\/blockquote>\n<p>You need to iterate through and check if such item exists. You can use <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/en.cppreference.com\/w\/cpp\/algorithm\/find\">`std::find_if()<\/a> with a lambda or do that through a loop. If you do that quite often you may want to index values as well (see below)<\/p>\n<blockquote>\n<p>Q2: How to iterate through all the values in a map and find the largest value or the smallest value ?<\/p>\n<\/blockquote>\n<p>Again you iterate through container and find it or you can use <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/en.cppreference.com\/w\/cpp\/algorithm\/min_element\"><code>std::max_element()<\/code><\/a> or <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/en.cppreference.com\/w\/cpp\/algorithm\/min_element\"><code>std::min_element()<\/code><\/a> with a lambda as well. Though if you need to access values in sorted order you may consider to use <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/www.boost.org\/doc\/libs\/1_65_0\/doc\/html\/boost\/container\/multimap.html\"><code>boost::multimap<\/code><\/a> which will allow to access data using hashed index by name and provide sorted or hashed index(es) for values, though you should be aware of a price of every index added.<\/p>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\"><\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved How to determine whether a value exists in map in C++ <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] Q1: How to check if a value exists in hashmap? You need to iterate through and check if such item exists. You can use `std::find_if() with a lambda or do that through a loop. If you do that quite often you may want to index values as well (see below) Q2: How to iterate &#8230; <a title=\"[Solved] How to determine whether a value exists in map in C++\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-how-to-determine-whether-a-value-exists-in-map-in-c\/\" aria-label=\"More on [Solved] How to determine whether a value exists in map in C++\">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":[324,1493,761],"class_list":["post-12613","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-hashtable","tag-stl"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] How to determine whether a value exists in map in C++ - 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-how-to-determine-whether-a-value-exists-in-map-in-c\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] How to determine whether a value exists in map in C++ - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Q1: How to check if a value exists in hashmap? 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