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find_a_fake_coin_form_12.cpp
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find_a_fake_coin_form_12.cpp
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//---------------------------------------------------------------------------
#include <iostream>
#include <vector>
#include <cstdio>
#include <conio.h>
#include <cstdlib>
#include <ctime>
#include <cmath>
#include <cassert>
#include <cstdarg>
#include <limits.h>
using namespace std;
/**
** 源文件： find_a_fake_coin_form_12.cpp
** 功能说明：
** 测试程序，假币问题：12枚金币中存有一假币，且不知假币较轻或较重，给一天枰限称3次找出其中的假币并知其轻重。
程序罗列出所有不同的解法，共2*12种。
** 作者：junkun huang e-mail：huangjunkun@gmail.com
** 创建日期：2008-11 前 /
*/
int sum_coins(const int A[], int from, int to )
{
int sum = 0;
for (int i=from; i<=to; i++)
sum += A[i];
return sum;
}
void print_comp_tips(const char* format, ...)
{
va_list arg_ptr;
va_start(arg_ptr, format);
vector<int> args;
while (true)
{
int para = va_arg(arg_ptr, int);
if (-1 == para)
break;
args.push_back(para);
}
cout << " 天枰比较：{";
assert (0 == args.size() % 2);
const size_t comp_num = args.size()/2;
for (size_t i = 0; i < comp_num; ++i)
cout << args[i] << " ";
cout << "} VS {";
for (size_t i = comp_num; i < args.size(); ++i)
cout << args[i] << " ";
cout << "}" << endl;
va_end(arg_ptr);
}
bool find_a_fake_coin(const int A[], int& fake_coin, int& fake_state)
{
if (print_comp_tips("%d%d%d%d%d%d%d%d%d", 1, 2, 3, 4, 5, 6, 7, 8, -1),
sum_coins(A, 1, 4)==sum_coins(A, 5, 8) )
{
//假货币重量未知
if ( print_comp_tips("%d%d%d%d%d", 1, 9, 10, 11, -1),
(A[1]+A[9])==sum_coins(A, 10, 11) )
{
//A[12]是假币
if (print_comp_tips("%d%d%d", 1, 12, -1),
A[1] < A[12])//假币较重
fake_state = 1;
else//假币较轻
fake_state = 0;
fake_coin = 12;
}
else if ( (A[1]+A[9])>sum_coins(A, 10, 11) )
{
if (print_comp_tips("%d%d%d", 10, 11, -1),
A[10]==A[11])
{
//A[9]假币，较重
fake_state = 1;
fake_coin = 9;
}
else if (A[10]>A[11])
{
//A[11]假币，较轻
fake_state = 0;
fake_coin = 11;
}
else//if (A[10]<A[11])
{
//A[10]假币，较轻
fake_state = 0;
fake_coin = 10;
}
}
else if (print_comp_tips("%d%d%d", 10, 11, -1),
A[10]==A[11])
{
//A[9]假币，较轻
fake_state = 0;
fake_coin = 9;
}
else if (A[10]>A[11])
{
//A[10]假币，较重
fake_state = 1;
fake_coin = 10;
}
else//if (A[10]<A[11])
{
//A[11]假币，较重
fake_state = 1;
fake_coin = 11;
}
}
else if ( sum_coins(A, 1, 4)>sum_coins(A, 5, 8) )
{
if ( print_comp_tips("%d%d%d%d%d%d%d%d%d", 1, 6, 7, 8, 5, 9, 10, 11, -1),
(A[1]+sum_coins(A, 6, 8))==(A[5]+sum_coins(A, 9, 11)) )
{
//假货币重量较重
if ( print_comp_tips("%d%d%d", 2, 3, -1),
A[2]==A[3] )
fake_coin = 4;
else
fake_coin = A[2]>A[3] ? 2:3;
fake_state = 1;
}
else if ( (A[1]+sum_coins(A, 6, 8)) > (A[5]+sum_coins(A, 9, 11)) )
{
if (print_comp_tips("%d%d%d", 1, 9, -1),
A[1]==A[9])
{
fake_coin = 5;//假货币重量较轻
fake_state = 0;
}
else
{
fake_coin = 1;//假货币重量较重
fake_state = 1;
}
}
else//if ( (A[1]+Sum_Coin(A, 6, 8)) < (A[5]+Sum_Coin(A, 9, 11)) )
{
//假货币重量较轻
if (print_comp_tips("%d%d%d", 6, 7, -1),
A[6]==A[7])
fake_coin = 8;
else
fake_coin = A[6]<A[7] ? 6:7;
fake_state = 0;
}
}
//( Sum_Coin(A, 1, 4) < Sum_Coin(A, 5, 8) )
else if (print_comp_tips("%d%d%d%d%d%d%d%d%d", 1, 6, 7, 8, 5, 9, 10, 11, -1),
(A[1]+sum_coins(A, 6, 8))==(A[5]+sum_coins(A, 9, 11)) )
{
//假货币重量较轻
if (print_comp_tips("%d%d%d", 2, 3, -1),
A[2]==A[3] )
fake_coin = 4;
else
fake_coin = A[2]<A[3] ? 2:3;
fake_state = 0;
}
else if ( (A[1]+sum_coins(A, 6, 8)) > (A[5]+sum_coins(A, 9, 11)) )
{
//假货币重量较重
if (print_comp_tips("%d%d%d", 6, 7, -1),
A[6]==A[7])
fake_coin = 8;
else
fake_coin = A[6]>A[7] ? 6:7;
fake_state = 1;
}
else if (print_comp_tips("%d%d%d", 1, 9, -1),
A[1]==A[9])
{
fake_coin = 5;//假货币重量较重
fake_state = 1;
}
else
{
fake_coin = 1;//假货币重量较轻
fake_state = 0;
}
return true;
}
void print_coins(const int pCoins[], int count)
{
cout << "[编号]轻重";
for (int i=1; i<=count; ++i)
{
cout << " [" << i << "]"<< pCoins[i];
}
cout << endl;
}
int main()
{
time_t t;
srand((unsigned) time(&t));
char c;
const int COINS_COUNT = 12;
int pCoins[COINS_COUNT+1] = {0};
do
{
system("cls");
cout << " 假币问题：12枚金币中存有一假币，且不知假币较轻或较重，给一天枰限称3次找出其中的假币并知其轻重。演示如下：\n";
// int fake_s = rand()%2;//1 ，假币较重； 0 ，假币较轻
// int fake_pos = (rand()%COINS_COUNT)+1;
for (int fake_s = 0; fake_s < 2; ++fake_s)
for (int fake_pos = 1; fake_pos <= COINS_COUNT; ++ fake_pos)
{
cout << " NO." << (fake_s)*COINS_COUNT + fake_pos << " --- --- --- --- --- --- --- --- --- --- --- ---\n";
int fake_coin = -1; //假币位置
int fake_state = -1; //1 ，假币较重； 0 ，假币较轻
for (int i=1; i<=COINS_COUNT; ++i)
pCoins[i] = 1;
if (fake_s==0)
pCoins[fake_pos] = 0;
else
pCoins[fake_pos] = 2;
print_coins(pCoins, COINS_COUNT);
find_a_fake_coin(pCoins, fake_coin, fake_state);
assert (-1 != fake_state && -1 != fake_coin);
cout << " 假币位置：" << fake_coin;
if ( fake_state==0 )
cout << " 假币较轻！\n";
else //if (1 ==fake_state)
cout << " 假币较重！\n";
cout << " --- end ---\n";
}
cout << "\n\n !!!按任意键继续，Esc退出程序!!!" << endl;
}
while( (c=getch())!=27 );
return 0;
}