POJ1013
枚举

#include<iostream>
#include<cstring>
using namespace std;
char Left[3][7];
char Right[3][7];
char res[3][7];
//假设c为假币 
bool isFake(char c, bool light){ 
//light为真表示假设假币为轻，否则表示假设假币为重 
	for(int i=0;i<3;i++){
		char *pLeft, *pRight; //指向天平两边的字符串 
		if(light){ 
			pLeft = Left[i];
			pRight = Right[i];
		}else{  //如果假设假币是重的，则把称量结果左右对换 
			pLeft = Right[i];
			pRight = Left[i];
		}
		switch(res[i][0]){
			case 'u':
				if(strchr(pRight, c) == NULL) return false; //右边天平没找到 
				break;
			case 'e':
				if(strchr(pLeft, c) || strchr(pRight, c)) return false; //在左右天平任一位置找到 
				break;
			case 'd':
				if(strchr(pLeft, c)==NULL) return false;
				break;
		}
	}
	return true;
}
int main(){
	int t;
	cin >> t;
	while(t--){
		for(int i=0; i<3; i++) cin>>Left[i]>>Right[i]>>res[i];
		for(char c='A'; c<='L'; c++){
			if(isFake(c,true)){
				cout<<c<<" is the counterfeit coin and it is light. \n";
				break;
			}else if(isFake(c, false)){
				cout<<c<<" is the counterfeit coin and it is heavy. \n";
				break;
			}
		}
	}
	return 0;
}