{"id":3063,"date":"2021-06-09T21:43:56","date_gmt":"2021-06-09T16:13:56","guid":{"rendered":"https:\/\/www.codingbroz.com\/?p=3063"},"modified":"2021-06-09T21:44:00","modified_gmt":"2021-06-09T16:14:00","slug":"flipping-coins-codechef-solution","status":"publish","type":"post","link":"https:\/\/www.codingbroz.com\/flipping-coins-codechef-solution\/","title":{"rendered":"Flipping Coins | CodeChef Solution"},"content":{"rendered":"\n<p>Hello coders, today we are going to solve <strong>Flipping Coins CodeChef Solution<\/strong> whose Problem Code is <strong>FLIPCOIN<\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1200\" height=\"675\" src=\"https:\/\/www.codingbroz.com\/wp-content\/uploads\/2021\/06\/flipping-coins-codechef-solution-codingbroz.png\" alt=\"Flipping Coins\" class=\"wp-image-3066\" srcset=\"https:\/\/www.codingbroz.com\/wp-content\/uploads\/2021\/06\/flipping-coins-codechef-solution-codingbroz.png 1200w, https:\/\/www.codingbroz.com\/wp-content\/uploads\/2021\/06\/flipping-coins-codechef-solution-codingbroz-768x432.png 768w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_65 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<label for=\"ez-toc-cssicon-toggle-item-662d57b1b4017\" class=\"ez-toc-cssicon-toggle-label\"><label class=\"ez-toc-title\">Table of Contents<\/label>\n<span class=\"ez-toc-cssicon\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #0090ff;color:#0090ff\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #0090ff;color:#0090ff\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-662d57b1b4017\" checked \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.codingbroz.com\/flipping-coins-codechef-solution\/#Task\" title=\"Task\">Task<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.codingbroz.com\/flipping-coins-codechef-solution\/#Input_Format\" title=\"Input Format\">Input Format<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.codingbroz.com\/flipping-coins-codechef-solution\/#Constraints\" title=\"Constraints\">Constraints<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.codingbroz.com\/flipping-coins-codechef-solution\/#Output_Format\" title=\"Output Format\">Output Format<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.codingbroz.com\/flipping-coins-codechef-solution\/#Solution_%E2%80%93_Flipping_Coins\" title=\"Solution &#8211; Flipping Coins \">Solution &#8211; Flipping Coins <\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.codingbroz.com\/flipping-coins-codechef-solution\/#C\" title=\"C++\">C++<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.codingbroz.com\/flipping-coins-codechef-solution\/#Python\" title=\"Python\">Python<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.codingbroz.com\/flipping-coins-codechef-solution\/#Java\" title=\"Java\">Java<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Task\"><\/span><strong>Task<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>There are N coins kept on the table, numbered from 0 to N &#8211; 1. Initially, each coin is kept tails up. You have to perform two types of operations:<\/p>\n\n\n\n<p>1) Flip all coins numbered between A and B inclusive. This is represented by the command &#8220;0 A B&#8221;<\/p>\n\n\n\n<p>2) Answer how many coins numbered between A and B inclusive are heads up. This is represented by the command &#8220;1 A B&#8221;.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Input_Format\"><\/span><strong>Input Format<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The first line contains two integers, N and Q. Each of the next Q lines are either of the form &#8220;0 A B&#8221; or &#8220;1 A B&#8221; as mentioned above.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Constraints\"><\/span><strong>Constraints<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul><li>1 &lt;= N &lt;= 100000<\/li><li>1 &lt;= Q &lt;= 100000<\/li><li>0 &lt;= A &lt;= B &lt;= N &#8211; 1<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Output_Format\"><\/span><strong>Output Format<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Output 1 line for each of the queries of the form &#8220;1 A B&#8221; containing the required answer for the corresponding query.<\/p>\n\n\n\n<p><strong>Sample Input<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>4 7\r\n1 0 3\r\n0 1 2\r\n1 0 1\r\n1 0 0\r\n0 0 3\r\n1 0 3 \r\n1 3 3<\/code><\/pre>\n\n\n\n<p><strong>Sample Output<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>0\r\n1\r\n0\r\n2\r\n1<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Solution_%E2%80%93_Flipping_Coins\"><\/span><strong>Solution &#8211; Flipping Coins <\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"C\"><\/span><strong>C++<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"cpp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include&lt;bits\/stdc++.h>\ntypedef long long ll;\nusing namespace std;\nll seg[400010];\nll lazy[400010];\nvoid up(int in,int l,int r,int sl,int sr)\n{\n    if(lazy[in]!=0)\n    {\n        seg[in]=(sr-sl+1)-seg[in];\n        if(sl!=sr){\n            lazy[2*in]=!lazy[2*in];\n            lazy[2*in+1]=!lazy[2*in+1];\n        }\n        lazy[in]=0;\n    }\n    if(r&lt;sl || l>sr || l>r)return;\n    if(sl>=l &amp;&amp; sr&lt;=r)\n    {\n        seg[in]=(sr-sl+1)-seg[in];\n        if(sl!=sr){\n            lazy[2*in]=!lazy[2*in];\n            lazy[2*in+1]=!lazy[2*in+1];\n        }\n        return;\n    }\n    int mid=sl+(sr-sl)\/2;\n    up(in*2,l,r,sl,mid);\n    up(in*2+1,l,r,mid+1,sr);\n    seg[in]=seg[in*2]+seg[in*2+1];\n}\nll sum(int in,int l,int r,int sl,int sr)\n{\n    if(lazy[in]!=0)\n    {\n        seg[in]=(sr-sl+1)-seg[in];\n        if(sl!=sr){\n            lazy[2*in]=!lazy[2*in];\n            lazy[2*in+1]=!lazy[2*in+1];\n        }\n        lazy[in]=0;\n    }\n    if(r&lt;sl || l>sr || l>r)return 0;\n    if(sl>=l &amp;&amp; sr&lt;=r)\n     return seg[in];\n    int mid=sl+(sr-sl)\/2;\n    return sum(in*2,l,r,sl,mid) + sum(in*2+1,l,r,mid+1,sr);\n}\nint main(){\n    ios_base::sync_with_stdio(0);\n    cin.tie(0);\n    int n,q;\n    cin>>n>>q;\n    while(q--)\n    {\n        int x,l,r;\n        cin>>x>>l>>r;\n        if(x==0)\n        up(1,l,r,0,n-1);\n        else{\n            cout&lt;&lt;sum(1,l,r,0,n-1)&lt;&lt;\"\\n\";\n        }\n    }\n}\n<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Python\"><\/span><strong>Python<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">import numpy as np\n\nn,q = map(int,input().split())\nList = np.zeros(n, dtype=bool)\n\nfor _ in range(q):\n    one,l,r = map(int,input().split())\n    \n    if one:\n        print(np.count_nonzero(List[l:r+1]))\n    else:\n        List[l:r+1] = ~List[l:r+1]<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Java\"><\/span><strong>Java<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"java\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/* package codechef; \/\/ don't place package name! *\/\n\nimport java.util.*;\nimport java.lang.*;\nimport java.io.*;\n\n\/* Name of the class has to be \"Main\" only if the class is public. *\/\nclass Codechef\n{\n    private static class FastReader {\n        BufferedReader reader;\n        StringTokenizer st;\n\n        public FastReader() {\n            reader = new BufferedReader(new InputStreamReader(System.in));\n        }\n\n        public String next() throws Exception {\n            if (st == null || !st.hasMoreElements()) {\n                st = new StringTokenizer(reader.readLine());\n            }\n            return st.nextToken();\n        }\n\n        public Integer nextInt() throws Exception {\n            return Integer.parseInt(next());\n        }\n    }\n    \n\tpublic static void main (String[] args) throws java.lang.Exception\n\t{\n\t\t\/\/ your code goes here\n\t\tFastReader reader = new FastReader();\n        int noOfCoins = reader.nextInt();\n        int noOfQueries = reader.nextInt();\n\n        BitSet bitSet = new BitSet(noOfCoins);\n        StringBuilder result = new StringBuilder();\n\n        for (int q = 0; q &lt; noOfQueries; q++){\n            int cmd = reader.nextInt();\n            int A = reader.nextInt();\n            int B = reader.nextInt();\n\n            if (cmd == 0) {\n                \/\/ Flip the coins\n                bitSet.flip(A, B + 1);\n            } else {\n                \/\/ Count set bits between the range\n                result.append(\"\" + bitSet.get(A, B + 1).cardinality() + \"\\n\");\n            }\n        }\n        \n        System.out.println(result.toString());\n\t}\n}\n<\/pre>\n\n\n\n<p><strong>Disclaimer:<\/strong> The above Problem <strong>(<a href=\"https:\/\/www.codechef.com\/problems\/FLIPCOIN\" target=\"_blank\" rel=\"noreferrer noopener\">Flipping Coins<\/a>)<\/strong> is generated by <strong>CodeChef <\/strong>but the Solution is Provided by <strong>CodingBroz<\/strong>. This tutorial is only for <strong>Educational<\/strong> and <strong>Learning<\/strong> Purpose.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Hello coders, today we are going to solve Flipping Coins CodeChef Solution whose Problem Code is FLIPCOIN.<\/p>\n","protected":false},"author":1,"featured_media":3066,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[54],"tags":[56],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"https:\/\/www.codingbroz.com\/wp-content\/uploads\/2021\/06\/flipping-coins-codechef-solution-codingbroz.png","jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/posts\/3063"}],"collection":[{"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/comments?post=3063"}],"version-history":[{"count":2,"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/posts\/3063\/revisions"}],"predecessor-version":[{"id":3067,"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/posts\/3063\/revisions\/3067"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/media\/3066"}],"wp:attachment":[{"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/media?parent=3063"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/categories?post=3063"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.codingbroz.com\/wp-json\/wp\/v2\/tags?post=3063"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}