标签:style class blog code com 2014
首先是要姿势正确!
注意完美数的生成机:
2+2a+2b+ab
ab都是完美数
假设生成完美数c
c = 2 + 2a + 2b + ab
c + 2 = ab+2a+2b+4
c + 2 = (a + 2)(b + 2)
然后一开始只有两个完美数1和3.
所以所有的完美数只有质因数分解之后都是类似于
N = (3 ^ x) * (5 ^ y)
但是5不是完美数。
然后就没事了。。。
/**** *COPYRIGHT NOTICE *Copyright (c) 2014 *All rights reserved *@author Shen *@name H *@file G:\My Source Code\比赛与日常练习\0608 - wuyiqi退役赛\H\H.cpp *@date 2014/6/8 18:30 */ //#pragma GCC optimize ("O2") //#pragma comment(linker, "/STACK:1024000000,1024000000") #include <cmath> #include <cstdio> #include <string> #include <cstring> #include <iomanip> #include <iostream> #include <algorithm> using namespace std; /*//STL #include <map> #include <vector> #include <list> #include <stack> #include <deque> #include <queue> */ /*//Computational Geometry #include <complex> #define x real() #define y imag() typedef complex<double> point; */ typedef long long int64; int a, b, n; void solve() { a = 0, b = 0, n += 2; while (n % 3 == 0) a++, n /= 3; while (n % 5 == 0) b++, n /= 5; if (n == 1) puts("Yes"); else puts("No"); return; } int main() { while (~scanf("%d", &n)) solve(); return 0; }
ACdream原创群赛(13)のwuyiqi退役专场 H Salmon And Cat,布布扣,bubuko.com
ACdream原创群赛(13)のwuyiqi退役专场 H Salmon And Cat
标签:style class blog code com 2014
原文地址:http://blog.csdn.net/polossk/article/details/29403087