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double ComputeEntropy(vector <vector <string> > remain_state, string attribute, string value,bool ifparent){  
    vector<int> count (2,0);  
    unsigned int i,j;  
    bool done_flag = false;//ÉÚ±øÖµ   
    for(j = 1; j < MAXLEN; j++){  
        if(done_flag) break;  
        if(!attribute_row[j].compare(attribute)){  
            for(i = 1; i < remain_state.size(); i++){  
                if((!ifparent&&!remain_state[j].compare(value)) || ifparent){//ifparent¼Ç¼ÊÇ·ñË㸸½Úµã   
                    if(!remain_state[MAXLEN - 1].compare(yes)){  
                        count[0]++;  
                    }  
                    else count[1]++;  
                }  
            }  
            done_flag = true;  
        }  
    }  
    if(count[0] == 0 || count[1] == 0 ) return 0;//È«²¿ÊÇÕýʵÀý»òÕ߸ºÊµÀý   
    //¾ßÌ弯ËãìØ ¸ù¾Ý[+count[0],-count[1]],log2Ϊµ×ͨ¹ý»»µ×¹«Ê½»»³É×ÔÈ»Êýµ×Êý   
    double sum = count[0] + count[1];  
    double entropy = -count[0]/sum*log(count[0]/sum)/log(2.0) - count[1]/sum*log(count[1]/sum)/log(2.0);  
    return entropy;  
}  

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