#pragma once
#include
#include
#include
using namespace std;
class MoonMath
{
public:
MoonMath(void);
~MoonMath(void);
//************************************
// Method: IsInt
// Access: public
// Describe: 判断double值在epsilon的范围内是否很接近整数
// 如1.00005在epsilon为0.00005以上就很接近整数
// Parameter: double doubleValue 要判断的double值
// Parameter: double epsilon 判断的精度,0 < epsilon < 0.5
// Parameter: INT32 & intValue 如果接近,返回最接近的整数值
// Returns: bool 接近返回true,否则返回false
//************************************
static bool IsInt(double doubleValue, double epsilon, INT32 &intValue);
//************************************
// Method: Sign
// Access: public
// Describe: 获取value的符号
// Parameter: T value 要获取符号的值
// Returns: INT32 正数、0和负数分别返回1、0和-1
//************************************
template
static INT32 Sign(T value);
const static UINT32 MIN_PRIMER = 2; // 最小的素数
//************************************
// Method: IsPrimer
// Access: public
// Describe: 判断一个数是否是素数
// Parameter: UINT32 num 要判断的数
// Returns: bool 是素数返回true,否则返回false
//************************************
static bool IsPrimer(UINT32 num);
//************************************
// Method: IsIntegerSquare
// Access: public static
// Describe: 判断给定的数开平方后是否为整数
// Parameter: UINT32 num
// Returns: bool
//************************************
static bool IsIntegerSquare(UINT32 num);
//************************************
// Method: GetDiffPrimerFactorNum
// Access: public static
// Describe: 获取num所有的不同质因数
// Parameter: UINT32 num
// Returns: set
//************************************
static set MoonMath::GetDiffPrimerFactorNum(UINT32 num);
};
#include "MoonMath.h"
#include
MoonMath::MoonMath(void)
{
}
MoonMath::~MoonMath(void)
{
}
template
INT32 MoonMath::Sign(T value)
{
if(value > 0)
{
return 1;
}
else if(value == 0)
{
return 0;
}
else
{
return -1;
}
}
bool MoonMath::IsInt(double doubleValue, double epsilon, INT32 &intValue)
{
if(epsilon > 0.5 || epsilon < 0)
{
return false;
}
if(INT32(doubleValue + epsilon) == INT32(doubleValue - epsilon))
{
return false;
}
INT32 value = INT32(doubleValue);
intValue = (fabs(doubleValue - value) > 0.5) ? (value + MoonMath::Sign(doubleValue)) : (value) ;
return true;
}
bool MoonMath::IsPrimer(UINT32 num)
{
if(num < MIN_PRIMER)
{
return false;
}
if(num == MIN_PRIMER)
{
return true;
}
// 判断是否能被2整除
if((num & 1) == 0)
{
return false;
}
UINT32 sqrtOfNum = (UINT32)sqrt((double)num); // num的2次方
// 从MIN_PRIMER到sqrt(num),如果任何数都不能被num整除,num是素数,否则不是
for(UINT32 i = MIN_PRIMER + 1; i <= sqrtOfNum; i += 2)
{
if(num % i == 0)
{
return false;
}
}
return true;
}
bool MoonMath::IsIntegerSquare(UINT32 num)
{
UINT32 qurtNum = (UINT32)sqrt((double)num);
return (qurtNum * qurtNum) == num;
}
set MoonMath::GetDiffPrimerFactorNum(UINT32 num)
{
UINT32 halfNum = num / 2;
set factors;
for(UINT32 i = 2; i <= halfNum; ++i)
{
if(!MoonMath::IsPrimer(i))
{
continue;
}
if(num % i == 0)
{
factors.insert(i);
while(num % i == 0)
{
num /= i;
}
}
}
return factors;
}
// Prime digit replacements
// Problem 51
// By replacing the 1st digit of *3, it turns out that six of the nine possible values: 13, 23, 43, 53, 73, and 83, are all prime.
//
// By replacing the 3rd and 4th digits of 56**3 with the same digit, this 5-digit number is the first example having seven primes among the ten generated numbers, yielding the family: 56003, 56113, 56333, 56443, 56663, 56773, and 56993. Consequently 56003, being the first member of this family, is the smallest prime with this property.
//
// Find the smallest prime which, by replacing part of the number (not necessarily adjacent digits) with the same digit, is part of an eight prime value family.
//
// 题目51:找出最小的能够通过改变同一部分得到八个质数的质数。
// 通过置换*3的第一位得到的9个数中,有六个是质数:13,23,43,53,73和83。
//
// 通过用同样的数字置换56**3的第三位和第四位,这个五位数是第一个能够得到七个质数的数字,得到的质数是:56003, 56113, 56333, 56443, 56663, 56773, 和 56993。因此其中最小的56003就是具有这个性质的最小的质数。
//
// 找出最小的质数,通过用同样的数字置换其中的一部分(不一定是相邻的部分),能够得到八个质数。
#include
#include
#include
#include
#include
#include
using namespace std;
// 打印时间等相关信息
class DetailPrinter
{
public:
void Start();
void End();
DetailPrinter();
private:
LARGE_INTEGER timeStart;
LARGE_INTEGER timeEnd;
LARGE_INTEGER freq;
};
DetailPrinter::DetailPrinter()
{
QueryPerformanceFrequency(&freq);
}
//************************************
// Method: Start
// Access: public
// Describe: 执行每个方法前调用
// Returns: void
//************************************
void DetailPrinter::Start()
{
QueryPerformanceCounter(&timeStart);
}
//************************************
// Method: End
// Access: public
// Describe: 执行每个方法后调用
// Returns: void
//************************************
void DetailPrinter::End()
{
QueryPerformanceCounter(&timeEnd);
cout << "Total Milliseconds is " << (double)(timeEnd.QuadPart - timeStart.QuadPart) * 1000 / freq.QuadPart << endl;
const char BEEP_CHAR = '\007';
cout << endl << "By GodMoon" << endl << __TIMESTAMP__ << BEEP_CHAR << endl;
system("pause");
}
/*************************解题开始*********************************/
const UINT32 RADIO = 10; // 进制
// 记录最小素数,可以增加的数以及可增加的次数
// 比如56003,可以增加的数为100,110,10,可增加的次数分别为9,9,9
struct FitInfo
{
UINT32 Num;
vector IncNums;
vector MaxIncTimes;
void Clear();
void AddIncNum(UINT32 incNum, UINT32 maxIncTimes);
};
//************************************
// Method: Clear
// Access: public
// Describe: 清空信息
// Returns: void
//************************************
void FitInfo::Clear()
{
Num = 0;
IncNums.clear();
MaxIncTimes.clear();
}
//************************************
// Method: AddIncNum
// Access: public
// Describe:
// Parameter: UINT32 incNum
// Parameter: UINT32 maxIncTimes
// Returns: void
//************************************
void FitInfo::AddIncNum(UINT32 incNum, UINT32 maxIncTimes)
{
IncNums.push_back(incNum);
MaxIncTimes.push_back(maxIncTimes);
}
//************************************
// Method: GetFitInfo
// Access: public
// Describe: 获取这个数的信息,替换连续的相同数字
// Parameter: UINT32 num
// Parameter: FitInfo & fitInfo
// Returns: void
//************************************
void GetAdjacentFitInfo(UINT32 num, FitInfo &fitInfo, UINT32 familyPrimerCount)
{
UINT32 numBak = num; // 备份num,用于循环
UINT32 currDigit; // 当前处理的数字
UINT32 lastDigit = num % RADIO; // 前一个处理的数字,初始化为第一个数字
UINT32 currWeight = 1; // 当前位的权重,为1,10,100……
UINT32 currIncNum = 0; // 当前num可增加的数
UINT32 addNum; // 用于递增计算连续可用的递增数
UINT32 incNum; // 用于保存连续可用的递增数
fitInfo.Clear();
fitInfo.Num = num;
while(numBak != 0)
{
currDigit = numBak % RADIO;
if(currDigit <= RADIO - familyPrimerCount)
{
// 如果上一个数字和当前数字一致,将其组合加入fitInfo
if(lastDigit == currDigit)
{
currIncNum += currWeight;
addNum = currWeight;
for(incNum = currWeight; incNum < currIncNum; incNum += addNum)
{
addNum /= RADIO;
fitInfo.AddIncNum(incNum, RADIO - currDigit - 1);
}
}
else
{
// 不一致的话,只添加currWeight
currIncNum = currWeight;
}
fitInfo.AddIncNum(currIncNum, RADIO - currDigit - 1);
}
else
{
currIncNum = 0;
}
currWeight *= 10;
lastDigit = currDigit;
numBak /= RADIO;
}
}
//************************************
// Method: GetNumMap
// Access: public
// Describe: 获取
// Parameter: UINT32 num
// Parameter: UINT32 digitIncNum[] 二进制的数字map,表示索引的数字所在十进制数中的位置
// Parameter: UINT32 radio
// Returns: void
//************************************
void GetNumMap(UINT32 num, UINT32 digitIncMap[], UINT32 radio)
{
UINT32 currDigit;
UINT32 currWeight = 1;
while(num != 0)
{
currDigit = num % radio;
digitIncMap[currDigit] |= currWeight;
currWeight <<= 1;
num /= radio;
}
}
//************************************
// Method: GetIncWeight
// Access: public
// Describe: 根据二进制Map获取可加权重
// Parameter: UINT32 digitIncMap 如:1010B
// Parameter: vector & incWeight 如:1000,10
// Returns: void
//************************************
void GetIncWeight(UINT32 digitIncMap, vector &incWeight)
{
UINT32 currWeight = 1;
incWeight.clear();
while(digitIncMap != 0)
{
if((digitIncMap & 1))
{
incWeight.push_back(currWeight);
}
currWeight *= RADIO;
digitIncMap >>= 1;
}
}
//************************************
// Method: GetValue
// Access: public
// Describe: 从map和权重中获取值
// Parameter: UINT32 map 数据位,如:101
// Parameter: vector & incWeight 权重,如:1000,100,1
// Returns: UINT32 值:如:1001
//************************************
UINT32 GetValue(UINT32 map, const vector &incWeight)
{
UINT32 value;
UINT32 index;
for(value = 0, index = 0; map; ++index)
{
if(map & 1)
{
value += incWeight[index];
}
map >>= 1;
}
return value;
}
//************************************
// Method: ParseDigitMap
// Access: public
// Describe: 从digitIncMap中计算出相应数字的fitInfo
// Parameter: UINT32 digitIncMap 表示数字digit的所在位比如10101101
// Parameter: UINT32 digit 范围[0,RADIO),表示某个数字
// Parameter: FitInfo & fitInfo
// Returns: void
//************************************
void ParseDigitMap(UINT32 digitIncMap, UINT32 digit, FitInfo &fitInfo)
{
vector incWeight;
GetIncWeight(digitIncMap, incWeight);
UINT32 maxMapValue = 1 << incWeight.size();
for(UINT32 mapValue = 1; mapValue < maxMapValue; ++mapValue)
{
fitInfo.AddIncNum(GetValue(mapValue, incWeight), RADIO - digit - 1);
}
}
//************************************
// Method: GetFitInfo
// Access: public
// Describe: 获取这个数的信息,替换不一定连续的相同数字
// Parameter: UINT32 num
// Parameter: FitInfo & fitInfo
// Returns: void
//************************************
void GetNotAdjacentFitInfo(UINT32 num, FitInfo &fitInfo, UINT32 familyPrimerCount)
{
UINT32 digitIncMap[RADIO] = {0};
fitInfo.Clear();
fitInfo.Num = num;
GetNumMap(num, digitIncMap, RADIO);
for(UINT32 digit = 0; digit < RADIO; ++digit)
{
ParseDigitMap(digitIncMap[digit], digit, fitInfo);
}
}
//************************************
// Method: CalcMaxPrimerCount
// Access: public
// Describe: 获取此族素数的个数
// Parameter: const FitInfo & fitInfo
// Returns: UINT32
//************************************
UINT32 CalcMaxPrimerCount(const FitInfo &fitInfo, UINT32 &maxFitIncNum, UINT32 &maxFitTimes)
{
UINT32 maxPrimerCount = 0;
UINT32 currPrimerCount = 1;
UINT32 fitCount = fitInfo.IncNums.size();
UINT32 currNum;
UINT32 fitIndex;
UINT32 fitIncTimes;
UINT32 fitIncCount;
UINT32 fitIncNum;
for(fitIndex = 0; fitIndex < fitCount; ++fitIndex)
{
currPrimerCount = 1; // 初始化为1,因为fitInfo.Num已经是素数了
currNum = fitInfo.Num;
fitIncNum = fitInfo.IncNums[fitIndex];
fitIncTimes = fitInfo.MaxIncTimes[fitIndex];
for(fitIncCount = 0; fitIncCount < fitIncTimes; ++fitIncCount)
{
currNum += fitIncNum;
if(MoonMath::IsPrimer(currNum))
{
++currPrimerCount;
if(currPrimerCount > maxPrimerCount)
{
maxFitIncNum = fitIncNum;
maxFitTimes = fitIncTimes;
maxPrimerCount = currPrimerCount;
}
}
}
}
return maxPrimerCount;
}
void TestFun1()
{
FitInfo fitInfo;
GetNotAdjacentFitInfo(100, fitInfo, 8);
cout << "Test OK!" << endl;
}
void F1()
{
cout << "void F1()" << endl;
// TestFun1();
DetailPrinter detailPrinter;
detailPrinter.Start();
/*********************************算法开始*******************************/
const UINT32 FAMILY_PRIMER_COUNT = 6; // 素数族中素数个数
FitInfo fitInfo;
UINT32 maxFitIncNum;
UINT32 maxFitTimes;
for(UINT32 num = 3;; num += 2)
{
if(MoonMath::IsPrimer(num))
{
GetNotAdjacentFitInfo(num, fitInfo, FAMILY_PRIMER_COUNT);
if(CalcMaxPrimerCount(fitInfo, maxFitIncNum, maxFitTimes) >= FAMILY_PRIMER_COUNT)
{
break;
}
}
}
cout << "拥有至少" << FAMILY_PRIMER_COUNT << "个素数的素数族中最小的素数为"
<< fitInfo.Num << endl
<< "素数族其他成员为:";
UINT32 primer = fitInfo.Num;
for(UINT32 i = 0; i < maxFitTimes; ++i)
{
primer += maxFitIncNum;
if(MoonMath::IsPrimer(primer))
{
cout << primer << " ";
}
}
cout << endl;
/*********************************算法结束*******************************/
detailPrinter.End();
}
//主函数
int main()
{
F1();
return 0;
}
/*
void F1()
拥有至少6个素数的素数族中最小的素数为13
素数族其他成员为:23 43 53 73 83
Total Milliseconds is 4.50833
By GodMoon
Sun Mar 24 21:44:13 2013
void F1()
拥有至少7个素数的素数族中最小的素数为56003
素数族其他成员为:56113 56333 56443 56663 56773 56993
Total Milliseconds is 481.138
By GodMoon
Sun Mar 24 21:43:49 2013
void F1()
拥有至少8个素数的素数族中最小的素数为121313
素数族其他成员为:222323 323333 424343 525353 626363 828383 929393
Total Milliseconds is 1023.6
By GodMoon
Sun Mar 24 21:41:17 2013
*/