题目链接：

进制转换，但是没有拿到满分，还有点小问题，下面是代码

1 #include
     
       2 #include
      
        3 using namespace std; 4  5 long trans(string num,int radix){ 6     int in[10] = {
   1}; 7     for(int i = 1; i < 10; i++){ 8         in[i] = in[i-1]*radix; 9     }10     int x = num.size();11     long stem = 0;12     for(int i = x-1; i >= 0; i--){13         if(num[i] >= '0' && num[i] <= '9'){14             stem += (int)(num[i]-'0')*in[x-i-1];15         }16         else{17             stem += ((int)(num[i]-'a')+10)*in[x-i-1];18         }19     }20     return stem;21 }22 int main(){23     string str[2];24     int n,radix;25     std::ios::sync_with_stdio(false);26     std::cin.tie(0);27     int n_1 = 0;28     while(cin >> str[0]){29         cin >> str[1]>>n>>radix;30         long stem = 0, stem_x = 0;31         int max = 0,ste,radix_x = 0;32         stem = trans(str[n-1],radix);33         n_1 = str[2-n].size();34         for(int i = 0; i < n_1; i++){35             if(str[2-n][i] >= '0' && str[2-n][i] <= '9'){36                 ste = (int)(str[2-n][i]-'0');37             }38             else{39                 ste = (int)(str[2-n][i]-'a')+10;40             }41             if(ste > max) max = ste;42         }43         radix_x = max+1;44         while(stem_x < stem){45             stem_x = trans(str[2-n],radix_x);46             radix_x++;47         }48         if(stem_x == stem) cout << radix_x-1 << endl;49         else cout << "Impossible" << endl;50     }51     return 0;52 }