{"id":30047,"date":"2023-01-13T00:08:09","date_gmt":"2023-01-12T18:38:09","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-project-euler-8-c-debug-closed\/"},"modified":"2023-01-13T00:08:09","modified_gmt":"2023-01-12T18:38:09","slug":"solved-project-euler-8-c-debug-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-project-euler-8-c-debug-closed\/","title":{"rendered":"[Solved] Project Euler 8 C++ Debug [closed]"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-51425036\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"51425036\" data-parentid=\"51424403\" data-score=\"2\" data-position-on-page=\"2\" data-highest-scored=\"0\" data-question-has-accepted-highest-score=\"0\" itemprop=\"suggestedAnswer\" 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>Adding to Igor Tandetnik&#8217;s answer:<\/p>\n<p>There is another problem, <code>(n[i]-'0')*(n[i+1]-'0')*(n[i+2]-'0')*(n[i+3]-'0')*(n[i+4]-'0')*(n[i+5]-'0')*(n[i+6]-'0')*(n[i+7]-'0')*(n[i+8]-'0')*(n[i+9]-'0')*(n[i+10]-'0')*(n[i+11]-'0')*(n[i+12]-'0')<\/code> is calculated as an <code>int<\/code> and therefore it will overflow for example at <code>i == 88<\/code>. You have to cast the first value to <code>unsigned long long<\/code> to have the whole calculation as <code>unsigned long long<\/code>.<\/p>\n<pre><code>#include &lt;iostream&gt;\n#include &lt;string&gt;\nusing namespace std;\nint main(){\n    const string n=\"7316717653133062491922511967442657474235534919493496983520312774506326239578318016984801869478851843858615607891129494954595017379583319528532088055111254069874715852386305071569329096329522744304355766896648950445244523161731856403098711121722383113622298934233803081353362766142828064444866452387493035890729629049156044077239071381051585930796086670172427121883998797908792274921901699720888093776657273330010533678812202354218097512545405947522435258490771167055601360483958644670632441572215539753697817977846174064955149290862569321978468622482839722413756570560574902614079729686524145351004748216637048440319989000889524345065854122758866688116427171479924442928230863465674813919123162824586178664583591245665294765456828489128831426076900422421902267105562632111110937054421750694165896040807198403850962455444362981230987879927244284909188845801561660979191338754992005240636899125607176060588611646710940507754100225698315520005593572972571636269561882670428252483600823257530420752963450\";\n    unsigned long long int mx=0;\n    for(size_t i=0; i&lt; n.length() - 12; i++){\n\n        unsigned long long int ths= (unsigned long long)(n[i]-'0')*(n[i+1]-'0')*(n[i+2]-'0')*(n[i+3]-'0')*(n[i+4]-'0')*(n[i+5]-'0')*(n[i+6]-'0')*(n[i+7]-'0')*(n[i+8]-'0')*(n[i+9]-'0')*(n[i+10]-'0')*(n[i+11]-'0')*(n.at(i+12)-'0');\n        if(ths&gt;mx){\n            mx=ths;\n\n        }\n    }\n\n    cout&lt;&lt;mx;\n}\n<\/code><\/pre>\n<p>will print <code>23514624000<\/code>.<\/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 Project Euler 8 C++ Debug [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] Adding to Igor Tandetnik&#8217;s answer: There is another problem, (n[i]-&#8216;0&#8217;)*(n[i+1]-&#8216;0&#8217;)*(n[i+2]-&#8216;0&#8217;)*(n[i+3]-&#8216;0&#8217;)*(n[i+4]-&#8216;0&#8217;)*(n[i+5]-&#8216;0&#8217;)*(n[i+6]-&#8216;0&#8217;)*(n[i+7]-&#8216;0&#8217;)*(n[i+8]-&#8216;0&#8217;)*(n[i+9]-&#8216;0&#8217;)*(n[i+10]-&#8216;0&#8217;)*(n[i+11]-&#8216;0&#8217;)*(n[i+12]-&#8216;0&#8217;) is calculated as an int and therefore it will overflow for example at i == 88. You have to cast the first value to unsigned long long to have the whole calculation as unsigned long long. #include &lt;iostream&gt; #include &lt;string&gt; using namespace std; int &#8230; <a title=\"[Solved] Project Euler 8 C++ Debug [closed]\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-project-euler-8-c-debug-closed\/\" aria-label=\"More on [Solved] Project Euler 8 C++ Debug [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":[324,513],"class_list":["post-30047","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-c11"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Project Euler 8 C++ Debug [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-project-euler-8-c-debug-closed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Project Euler 8 C++ Debug [closed] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Adding to Igor Tandetnik&#8217;s answer: There is another problem, (n[i]-&#039;0&#039;)*(n[i+1]-&#039;0&#039;)*(n[i+2]-&#039;0&#039;)*(n[i+3]-&#039;0&#039;)*(n[i+4]-&#039;0&#039;)*(n[i+5]-&#039;0&#039;)*(n[i+6]-&#039;0&#039;)*(n[i+7]-&#039;0&#039;)*(n[i+8]-&#039;0&#039;)*(n[i+9]-&#039;0&#039;)*(n[i+10]-&#039;0&#039;)*(n[i+11]-&#039;0&#039;)*(n[i+12]-&#039;0&#039;) is calculated as an int and therefore it will overflow for example at i == 88. 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