pku 1013 Counterfeit Dollar

http://acm.pku.edu.cn/JudgeOnline/problem?id=1013

找出假币問題，輸入三次資料以及結果、然後找出哪個币是假的。枚舉

#include <stdio.h>

#include <string.h>

char left[3][7],right[3][7],result[3][5];

bool isLight(char x)

{

 int i;

 for(i = 0;i < 3;i ++)

 {

  switch(result[i][0])

  {

  case 'u':

   if(strchr(right[i],x) == NULL)

    return false;

   break;

  case 'e':

   if(strchr(right[i],x) != NULL || strchr(left[i],x) != NULL)

    return false;

   break;

  case 'd':

   if(strchr(left[i],x) == NULL)

    return false;

   break;

  }

 }

 return true;

}

bool isHeavy(char x)

{

 int i;

 for(i = 0;i < 3;i ++)

 {

  switch(result[i][0])

  {

  case 'u':

   if(strchr(left[i],x) == NULL)

    return false;

   break;

  case 'e':

   if(strchr(right[i],x) != NULL || strchr(left[i],x) != NULL)

    return false;

   break;

  case 'd':

   if(strchr(right[i],x) == NULL)

    return false;

   break;

  }

 }

 return true;

}

int main()

{

 int time,i;

 char c;

 scanf("%d",&time);

 while(time --)

 {

  for(i = 0;i < 3;i ++)

   scanf("%s%s%s",left[i],right[i],result[i]);

  for(c = 'A';c <= 'L'; c ++)

  {

   if(isLight(c))

   {

    printf("%c is the counterfeit coin and it is light./n",c);

    break;

   }

   if(isHeavy(c))

   {

    printf("%c is the counterfeit coin and it is heavy./n",c);

    break;

   }

  }

 }

 return 0 ;

}