{"id":6118,"date":"2023-12-14T23:02:54","date_gmt":"2023-12-14T15:02:54","guid":{"rendered":"https:\/\/zyrastory.com\/?p=6118"},"modified":"2023-12-14T23:06:13","modified_gmt":"2023-12-14T15:06:13","slug":"codeforces-4b-before-an-exam-solution-and-explanation-en","status":"publish","type":"post","link":"https:\/\/zyrastory.com\/en\/coding-en\/codeforces-en\/codeforces-4b-before-an-exam-solution-and-explanation-en\/","title":{"rendered":"Codeforces 4B Before an Exam Solution &amp; Explanation"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_66_1 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >\u5167\u5bb9\u76ee\u9304<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" 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: #999;color:#999\" 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><\/span><\/a><\/span><\/div>\n<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:\/\/zyrastory.com\/en\/coding-en\/codeforces-en\/codeforces-4b-before-an-exam-solution-and-explanation-en\/#problem-description\" title=\"Problem Description\">Problem Description<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/zyrastory.com\/en\/coding-en\/codeforces-en\/codeforces-4b-before-an-exam-solution-and-explanation-en\/#solution\" title=\"Solution\">Solution<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/zyrastory.com\/en\/coding-en\/codeforces-en\/codeforces-4b-before-an-exam-solution-and-explanation-en\/#c-solution\" title=\"C# Solution\">C# Solution<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/zyrastory.com\/en\/coding-en\/codeforces-en\/codeforces-4b-before-an-exam-solution-and-explanation-en\/#java-solution\" title=\"Java Solution\">Java Solution<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/zyrastory.com\/en\/coding-en\/codeforces-en\/codeforces-4b-before-an-exam-solution-and-explanation-en\/#conclusion\" title=\"Conclusion\">Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n\n<p>Difficulty : 1200<\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"problem-description\"><\/span><strong>Problem Description<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Tomorrow Peter has a Biology exam. He does not like this subject much, but&nbsp;<em>d<\/em>&nbsp;days ago he learnt that he would have to take this exam. Peter&#8217;s strict parents made him prepare for the exam immediately, for this purpose he has to study not less than&nbsp;<em>minTime<\/em><sub><em>i<\/em><\/sub>&nbsp;and not more than&nbsp;<em>maxTime<\/em><sub><em>i<\/em><\/sub>&nbsp;hours per each&nbsp;<em>i<\/em>-th day. Moreover, they warned Peter that a day before the exam they would check how he has followed their instructions.<\/p>\n\n\n\n<p>So, today is the day when Peter&#8217;s parents ask him to show the timetable of his preparatory studies. But the boy has counted only the sum of hours&nbsp;<em>sumTime<\/em>&nbsp;spent him on preparation, and now he wants to know if he can show his parents a timetable&nbsp;<em>s\u0441hedule<\/em>&nbsp;with&nbsp;<em>d<\/em>&nbsp;numbers, where each number&nbsp;<em>s\u0441hedule<\/em><sub><em>i<\/em><\/sub>&nbsp;stands for the time in hours spent by Peter each&nbsp;<em>i<\/em>-th day on biology studies, and satisfying the limitations imposed by his parents, and at the same time the sum total of all&nbsp;<em>schedule<\/em><sub><em>i<\/em><\/sub>&nbsp;should equal to&nbsp;<em>sumTime<\/em>.<\/p>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p><strong>Input<\/strong><\/p>\n\n\n\n<p>The first input line contains two integer numbers&nbsp;<em>d<\/em>,\u2009<em>sumTime<\/em>&nbsp;(1\u2009\u2264\u2009<em>d<\/em>\u2009\u2264\u200930,\u20090\u2009\u2264\u2009<em>sumTime<\/em>\u2009\u2264\u2009240) \u2014 the amount of days, during which Peter studied, and the total amount of hours, spent on preparation. Each of the following&nbsp;<em>d<\/em>&nbsp;lines contains two integer numbers&nbsp;<em>minTime<\/em><sub><em>i<\/em><\/sub>,\u2009<em>maxTime<\/em><sub><em>i<\/em><\/sub>&nbsp;(0\u2009\u2264\u2009<em>minTime<\/em><sub><em>i<\/em><\/sub>\u2009\u2264\u2009<em>maxTime<\/em><sub><em>i<\/em><\/sub>\u2009\u2264\u20098), separated by a space \u2014 minimum and maximum amount of hours that Peter could spent in the&nbsp;<em>i<\/em>-th day.<\/p>\n\n\n\n<p><strong>Output<\/strong><\/p>\n\n\n\n<p>In the first line print&nbsp;YES, and in the second line print&nbsp;<em>d<\/em>&nbsp;numbers (separated by a space), each of the numbers \u2014 amount of hours, spent by Peter on preparation in the corresponding day, if he followed his parents&#8217; instructions; or print&nbsp;NO&nbsp;in the unique line. If there are many solutions, print any of them.<\/p>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p><strong>Examples<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-border-color has-palette-color-4-border-color has-fixed-layout\"><tbody><tr><td>Input<\/td><td>1 48<br>5 7<\/td><\/tr><tr><td>Output<\/td><td>NO<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<div style=\"height:15px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-border-color has-palette-color-4-border-color has-fixed-layout\"><tbody><tr><td>Input<\/td><td>2 5<br>0 1<br>3 5<\/td><\/tr><tr><td>Output<\/td><td>YES<br>1 4<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<div style=\"height:45px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"solution\"><\/span><strong>Solution<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>In our solution, we will use two loop with many calculate to solve this problem.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"c-solution\"><\/span><strong>C# Solution<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p><strong>Solution1<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-csharp\" data-lang=\"C#\"><code>string[] first = Console.ReadLine().Split(&#39; &#39;); \/\/split by space\nint d = int.Parse(first[0]);    \/\/days\nint sumTime = int.Parse(first[1]); \n\nint[]minArr = new int[d];   \/\/min value also use as the result\nint[]leftArr = new int[d];\n\nfor(int i=0;i&lt;d;i++)\n{\n    var arr = Console.ReadLine().Split(&#39; &#39;);\n    var min = int.Parse(arr[0]);  \n    var max = int.Parse(arr[1]);  \n    \n    sumTime-=min;\n    minArr[i] = min;\n    leftArr[i] = max-min;\n}\n\nif(sumTime==0){\n    Console.WriteLine(&quot;YES&quot;);\n    Console.WriteLine(String.Join(&quot; &quot;, minArr));\n}\nelse if(sumTime&lt;0){\n        Console.WriteLine(&quot;NO&quot;); \n}\n\/\/still need more time\nelse{\n    for(int i=0;i&lt;d;i++)\n    {\n        if(sumTime&gt;leftArr[i]){\n            sumTime -= leftArr[i];\n            minArr[i]+=leftArr[i];\n        }\n        else{\n            minArr[i]+=sumTime;\n            sumTime = 0;\n            Console.WriteLine(&quot;YES&quot;);\n            Console.WriteLine(String.Join(&quot; &quot;, minArr));\n            break;\n        }\n    }\n}\n\n\/\/still need more time!!\nif(sumTime&gt;0){\n    Console.WriteLine(&quot;NO&quot;); \n}<\/code><\/pre><\/div>\n\n\n\n<p>In this code, the minArr array is used to store the minimum time Peter spends studying biology each day, and it is also used as the final result. <\/p>\n\n\n\n<p>Let me explain why minArr is referred to as &#8220;also used as the result&#8221;:<\/p>\n\n\n\n<ul>\n<li><strong>Storing Minimum Time: <\/strong>In the first loop, minArr is used to store the minimum time Peter spends studying biology each day. This is achieved by the line of code minArr[i] = min;, which stores the minimum time for each day in the minArr array.<\/li>\n\n\n\n<li><strong>Result<\/strong>: After satisfying all the conditions, if sumTime becomes 0, then minArr represents a valid timetable because it contains the minimum time for each day. Therefore, when the conditions are met, you choose to use minArr to represent the final result, i.e., Peter&#8217;s timetable for studying biology.<\/li>\n<\/ul>\n\n\n\n<div style=\"height:45px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"java-solution\"><\/span><strong>Java Solution<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p><strong>Solution1<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-java\" data-lang=\"Java\"><code>import java.util.Scanner;\nimport java.util.Arrays;\n\npublic class Main {\n    public static void main(String[] args) {\n        Scanner scanner = new Scanner(System.in);\n        String[] first  = scanner.nextLine().split(&quot; &quot;);\n        \n        int d = Integer.parseInt(first[0]);    \/\/days\n        int sumTime = Integer.parseInt(first[1]); \n        \n        int[]minArr = new int[d];   \/\/min value also use as the result\n        int[]leftArr = new int[d];\n        \n        for(int i=0;i&lt;d;i++)\n        {\n            String[] arr = scanner.nextLine().split(&quot; &quot;);\n            int min = Integer.parseInt(arr[0]);  \n            int max = Integer.parseInt(arr[1]);  \n            \n            sumTime-=min;\n            minArr[i] = min;\n            leftArr[i] = max-min;\n        }\n        \n        if(sumTime==0){\n            System.out.println(&quot;YES&quot;);\n            System.out.println(String.join(&quot; &quot;, Arrays.stream(minArr).mapToObj(String::valueOf).toArray(String[]::new)));\n        }\n        else if(sumTime&lt;0){\n                System.out.println(&quot;NO&quot;); \n        }\n        \/\/still need more time\n        else{\n            for(int i=0;i&lt;d;i++)\n            {\n                if(sumTime&gt;leftArr[i]){\n                    sumTime -= leftArr[i];\n                    minArr[i]+=leftArr[i];\n                }\n                else{\n                    minArr[i]+=sumTime;\n                    sumTime = 0;\n                    System.out.println(&quot;YES&quot;);\n                    System.out.println(String.join(&quot; &quot;, Arrays.stream(minArr).mapToObj(String::valueOf).toArray(String[]::new)));\n                    break;\n                }\n            }\n        }\n        \n        \/\/still need more time!!\n        if(sumTime&gt;0){\n            System.out.println(&quot;NO&quot;); \n        }\n    }\n}<\/code><\/pre><\/div>\n\n\n\n<p>In Java, the <strong><em>String.join<\/em><\/strong> function requires a string array as input, so we need to convert <strong>minArr <\/strong>to a string array before printing it.<\/p>\n\n\n\n<div style=\"height:15px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-7929554876592461\"\n     crossorigin=\"anonymous\"><\/script>\n<!-- IN THE POST2 -->\n<ins class=\"adsbygoogle\"\n     style=\"display:block\"\n     data-ad-client=\"ca-pub-7929554876592461\"\n     data-ad-slot=\"8198193609\"\n     data-ad-format=\"auto\"\n     data-full-width-responsive=\"true\"><\/ins>\n<script>\n     (adsbygoogle = window.adsbygoogle || []).push({});\n<\/script>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"tw-target-text\"><span class=\"ez-toc-section\" id=\"conclusion\"><\/span><strong>Conclusion<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>This problem is the second problem of codeforces contest &#8211; <strong><em>Beta Round 4<\/em><\/strong><\/p>\n\n\n\n<p>You can find the solution for the first problem here &#8211; <a href=\"https:\/\/zyrastory.com\/en\/coding-en\/codeforces-en\/codeforces-4a-watermelon-solution-and-explanation-en\/\" target=\"_blank\" rel=\"noreferrer noopener\">Codeforces 4A Watermelon Solution &amp; Explanation<\/a><\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"has-medium-font-size\">\ud83e\udde1<strong>If my solution helps, that is my honor!<\/strong><\/p>\n\n\n\n<p class=\"has-medium-font-size\">\ud83e\udde1<strong>You can support me by sharing my posts, thanks you~~<\/strong><\/p>\n\n\n\n<p><strong>\u2705If you got any problem about the explanation or you need other programming language solution, please feel free to let me know !!<\/strong><\/p>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p><strong>The problem link :<\/strong> <a href=\"https:\/\/codeforces.com\/problemset\/problem\/4\/B\" target=\"_blank\" rel=\"noreferrer noopener\">Problem &#8211; 4B &#8211; Codeforces<\/a><\/p>\n\n\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p><strong>Random Codeforces Posts<\/strong><\/p>\n\n\n\n\t\t\t<div class=\"wp-block-uagb-post-grid uagb-post-grid  uagb-post__image-position-top uagb-post__image-disabled uagb-block-613bccac     uagb-post__items uagb-post__columns-3 is-grid uagb-post__columns-tablet-2 uagb-post__columns-mobile-1 uagb-post__equal-height\" data-total=\"30\" style=\"\">\n\n\t\t\t\t\t\t\t\t\t\t\t\t<article class=\"uagb-post__inner-wrap\">\t\t\t\t\t\t\t\t<h4 class=\"uagb-post__title uagb-post__text\">\n\t\t\t\t<a href=\"https:\/\/zyrastory.com\/en\/coding-en\/leetcode-en\/leetcode-881-boats-to-save-people-solution-and-explanation-en\/\" target=\"_self\" rel=\"bookmark noopener noreferrer\">LeetCode #881 Boats to Save People Solution &amp; Explanation<\/a>\n\t\t\t<\/h4>\n\t\t\t\t\t\t<div class='uagb-post__text uagb-post-grid-byline'>\n\t\t\t\t\t\t\t\t<time datetime=\"2024-05-05T23:59:32+08:00\" class=\"uagb-post__date\">\n\t\t\t\t<span class=\"dashicons-calendar dashicons\"><\/span>\t\t\t\t\t2024-05-05\t\t\t\t<\/time>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<div class=\"uagb-post__text uagb-post__cta wp-block-button\">\n\t\t\t\t<a class=\"wp-block-button__link uagb-text-link\" href=\"https:\/\/zyrastory.com\/en\/coding-en\/leetcode-en\/leetcode-881-boats-to-save-people-solution-and-explanation-en\/\" target=\"_self\" rel=\"bookmark noopener noreferrer\">Read More<\/a>\n\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t<\/article>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<article class=\"uagb-post__inner-wrap\">\t\t\t\t\t\t\t\t<h4 class=\"uagb-post__title uagb-post__text\">\n\t\t\t\t<a href=\"https:\/\/zyrastory.com\/en\/coding-en\/codeforces-en\/codeforces-50b-choosing-symbol-pairs-solution-and-explanation-en\/\" target=\"_self\" rel=\"bookmark noopener noreferrer\">Codeforces 50B Choosing Symbol Pairs Solution &#038; 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