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DescriptionIn 1742, Christian Goldbach, a German amateur mathematician, sent a letter to Leonhard Euler in which he made the following conjecture:Every even number greater than 4 can bewritten as the sum of two odd prime numbers.For example:8 = 3 + 5. Both 3 and 5 are odd prime numbers.20 = 3 + 17 = 阅读全文
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要求： 输入正整数n，（2<=n<=100）把阶乘分解成素数因子相乘的形式，从小到大输出各个素数的指数。sample input:523sample output:5!=3 1 153!=49 23 12 8 4 4 3 2 2 1 1 1 1 1 1 1code:View Code #include<stdio.h>#include<string.h>//素数判定int isprime(int n){ if(i%2==0&&i!=2) return 0;for(i=2;i*i<=n;i++) if(n%i==0) return 0; 阅读全文
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Problem DescriptionThe digital root of a positive integer is found by summing the digits of the integer. If the resulting value is a single digit then that digit is the digital root. If the resulting value contains two or more digits, those digits are summed and the process is repeated. This is cont 阅读全文
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Problem DescriptionIgnatius is poor at math,he falls across a puzzle problem,so he has no choice but to appeal to Eddy. this problem describes that:f(x)=5*x^13+13*x^5+k*a*x,input a nonegative integer k(k<10000),to find the minimal nonegative integer a,make the arbitrary integer x ,65|f(x)ifno exi 阅读全文
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Problem DescriptionWe all know that Bin-Laden is a notorious terrorist, and he has disappeared for a long time. But recently, it is reported that he hides in Hang Zhou of China! “Oh, God! How terrible! ”Don’t be so afraid, guys. Although he hides in a cave of Hang Zhou, he dares not to go out. Laden 阅读全文
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Problem DescriptionPeople in Silverland use square coins. Not only they have square shapes but also their values are square numbers. Coins with values of all square numbers up to 289 (=17^2), i.e., 1-credit coins, 4-credit coins, 9-credit coins, ..., and 289-credit coins, are available in Silverland 阅读全文
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Problem Description"Well, it seems the first problem is too easy. I will let you know how foolish you are later." feng5166 says."The second problem is, given an positive integer N, we define an equation like this:N=a[1]+a[2]+a[3]+...+a[m];a[i]>0,1<=m<=N;My question is how man 阅读全文
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Problem Description1,2,...,n表示n个盘子．数字大盘子就大．n个盘子放在第１根柱子上．大盘不能放在小盘上．在第１根柱子上的盘子是a[1],a[2],...,a[n]. a[1]=n,a[2]=n-1,...,a[n]=1.即a[1]是最下面的盘子．把n个盘子移动到第３根柱子．每次只能移动１个盘子，且大盘不能放在小盘上．问第m次移动的是那一个盘子.Input每行2个整数n (1 ≤ n ≤ 63) ,m≤ 2^n-1.n=m=0退出Output输出第m次移动的盘子的号数．Sample Input63 1 63 2 0 0Sample Output1 2分析：从 移动看出 阅读全文
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Problem Description据说在很久很久以前，可怜的兔子经历了人生中最大的打击——赛跑输给乌龟后，心中郁闷，发誓要报仇雪恨，于是躲进了杭州下沙某农业园卧薪尝胆潜心修炼，终于练成了绝技，能够毫不休息得以恒定的速度(VR m/s)一直跑。兔子一直想找机会好好得教训一下乌龟，以雪前耻。最近正值HDU举办50周年校庆，社会各大名流齐聚下沙，兔子也趁此机会向乌龟发起挑战。虽然乌龟深知获胜希望不大，不过迫于舆论压力，只能接受挑战。比赛是设在一条笔直的道路上，长度为L米，规则很简单，谁先到达终点谁就算获胜。无奈乌龟自从上次获胜以后，成了名龟，被一些八卦杂志称为“动物界的刘翔”，广告不断，手头也有 阅读全文