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You are given the following information, but you may prefer to do some research for yourself.1 Jan 1900 was a Monday.
Thirty days has September,
April, June and November.
All the rest have thirty-one,
Saving February alone,
Which has twenty-eight, rain or shine.
And on leap years, twenty-nine.
A leap year occurs on any year evenly divisible by 4, but not on a century unless it is divisible by 400.
How many Sundays fell on the first of the month during the twentieth century (1 Jan 1901 to 31 Dec 2000)? 标签: <无>
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<html> <head> </head> <body style="text-align=center;font-size:32px;"> <table align="center"> <tr><td><div id="problemNum" style='background-color:#999999;width:800;text-align:center;font-size:32px;'></div></td></tr> <tr><td><div id="problemContent" style='word-wrap:break-word;background-color:#bbbbbb;width:800;text-align:left;font-size:Npx;'></div></td></tr> <tr><td><div id="sum" style='word-wrap:break-word; color:#ffff22;font-size:48;background-color:#8855ff;width:800;text-align:center;'></div></td></tr> <tr><td><div id="copyleft" style='word-wrap:break-word; color:#ffff22;font-size:18;background-color:#666666;width:800;text-align:right;'></div></td></tr> <script language="javascript"> //---------------------------------// // Project Euler // // Author:thrombin // Date:2015-12-19 //---------------------------------// var p_order=19;//Problem Order var problem='You are given the following information, but you may prefer to do some research for yourself.<br/>\ 1 Jan 1900 was a Monday.<br/>\ Thirty days has September,<br/>\ April, June and November.<br/>\ All the rest have thirty-one,<br/>\ Saving February alone,<br/>\ Which has twenty-eight, rain or shine.<br/>\ And on leap years, twenty-nine.<br/>\ A leap year occurs on any year evenly divisible by 4, but not on a century unless it is divisible by 400.<br/>\ How many Sundays fell on the first of the month during the twentieth century (1 Jan 1901 to 31 Dec 2000)?'; //solve the problem //==============编程思路简介================ // 扫描所有的日子,判断相比与1900年1月2日是否间隔天数是否为7的整数倍 // 同时判断当天是否为月初一号 // 同时满足以上两个条件计数值加一 //===================================== var monthDays=[31,28,31,30,31,30,31,31,30,31,30,31]; var leapYear=false;//用于保存当前年份是否为闰年 var days=1;//用于保存从1900年1月2日开始经过的天数 var result=0;//用于保存同时是周日和月初第一天的次数 for(var year=1900;year<2001;year++){ if((year%4==0 && year%100!=0) ||(year%400==0))leapYear=true; else{leapYear=false;} for(var month=0;month<12;month++){ if(days%7==0 && year>1900)result++; days+=monthDays[month]; if(leapYear && month==1)days++; } } //update browser document.getElementById("problemNum").innerHTML="Project Euler-Problem "+p_order; document.getElementById("problemContent").innerHTML=problem; document.getElementById("sum").innerHTML="Answer:"+result; document.getElementById("copyleft").innerHTML="CopyLeft@Thrombin 2015"; </script> </body> </html>
Project Euler Problem 15
Startinginthetopleftcornerofa2×2grid,andonlybeingabletomovetotherightanddown,&nb…
Project Euler Problem 19
Youaregiventhefollowinginformation,butyoumayprefertodosomeresearchforyourself.