hdu 6828-Little Rabbit‘s Equation

hdu 6828-Little Rabbit’s Equation

又忘开 long long了，！

#include
using namespace std;
typedef long long ll;

ll toTen(string a, int bit){
    int i,b=1,sum=0,length=a.length();
    for(i=length-1;i>=0;i--){
        if(a[i]>='A')sum+=(a[i]-'A'+10)*b,b*=bit;
        else sum+=(a[i]-'0')*b,b*=bit;
    }
    return sum;
}

int main(){
    int d,e,flag=0;
    string s;
    while(cin>>s){
        e=2,flag=0;
        string a,b,c;
        for(int i=0,k=0; i<s.length(); i++){
            if(s[i]>='0'&&s[i]<='9'){int x=s[i]-'0'+1;if(x>e)e=x;}
            if(s[i]>='A'&&s[i]<='F'){int x=s[i]-'A'+11;if(x>e)e=x;}
            if(s[i]=='*'||s[i]=='/'||s[i]=='+'||s[i]=='-'){
                string s1(s,0,i);
                k=i,a=s1;
                if(s[i]=='*')d=1;
                if(s[i]=='/')d=2;
                if(s[i]=='+')d=3;
                if(s[i]=='-')d=4;
            }
            if(s[i]=='='){
                string s2(s,k+1,i-k-1),s3(s,i+1);
                k=i,b=s2,c=s3;
            }
        }//cout<
        for(; e<=16; e++){//cout<
            if(d==1)if(toTen(a,e)*toTen(b,e)==toTen(c,e)){cout<<e<<endl,flag=1;break;}
            if(d==2)if(toTen(a,e)*1.0/toTen(b,e)==1.0*toTen(c,e)){cout<<e<<endl,flag=1;break;}
            if(d==3)if(toTen(a,e)+toTen(b,e)==toTen(c,e)){cout<<e<<endl,flag=1;break;}
            if(d==4)if(toTen(a,e)-toTen(b,e)==toTen(c,e)){cout<<e<<endl,flag=1;break;}
        }
        if(!flag)cout<<-1<<endl;
    }
    return 0;
}