145 is a curious number, as 1! + 4! + 5! = 1 + 24 + 120 = 145. Find the sum of all numbers which are equal to the sum of the factorial of their digits. Note: as 1! = 1 and 2! = 2 are not sums they are not included. #include <iostream> #include <v…

题意:判断一个数 N 的各个位数阶乘之和是否为其本身,找出所有符合要求的数然后求和 思路:此题思路跟 30 题相同,找到枚举上界 10 ^ n <= 9! × n ,符合要求的 n < 6 ,因此选择 9! × 6 作为上界 /************************************************************************* > File Name: euler034.c > Author: WArobot > Blog: ht…

Problem 34 https://projecteuler.net/problem=34 145 is a curious number, as 1! + 4! + 5! = 1 + 24 + 120 = 145. 145是一个神奇的数字,1! + 4! + 5! = 1 + 24 + 120 = 145. Find the sum of all numbers which are equal to the sum of the factorial of their digits. 找到所有…

145 is a curious number, as 1! + 4! + 5! = 1 + 24 + 120 = 145. Find the sum of all numbers which are equal to the sum of the factorial of their digits. Note: as 1! = 1 and 2! = 2 are not sums they are not included. 题目大意: 145 是一个奇怪的数字, 因为 1! + 4! + 5!…

原题: 2857.   Digit Sorting Time Limit: 1.0 Seconds   Memory Limit: 65536KTotal Runs: 3234   Accepted Runs: 1704 Several players play a game. Each player chooses a certain number, writes it down (in decimal notation, without leading zeroes) and sorts t…

The fraction 49/98 is a curious fraction, as an inexperienced mathematician in attempting to simplify it may incorrectly believe that49/98 = 4/8, which is correct, is obtained by cancelling the 9s. We shall consider fractions like, 30/50 = 3/5, to be…

直接python搞过.没啥好办法.看了下别人做的,多数也是大数乘法搞过. 如果用大数做的话,c++写的话,fft优化大数乘法,然后快速幂一下就好了.…

Problem 34 145 is a curious number, as 1! + 4! + 5! = 1 + 24 + 120 = 145. Find the sum of all numbers which are equal to the sum of the factorial of their digits. Note: as 1! = 1 and 2! = 2 are not sums they are not included. puts (0..50000).select{|…

Problem 30 https://projecteuler.net/problem=30 Surprisingly there are only three numbers that can be written as the sum of fourth powers of their digits: 很惊奇地,只有三个数字可以写成它们的位数的四次方之和. 1634 = 14 + 64 + 34 + 448208 = 84 + 24 + 04 + 849474 = 94 + 44 + 74 …

Problem 63 https://projecteuler.net/problem=63 Powerful digit counts The 5-digit number, 16807=75, is also a fifth power. Similarly, the 9-digit number, 134217728=89, is a ninth power. 五位数16807同时是7的五次方,同样地,九位数134217728是8的九次方. How many n-digit positiv…