#include <bits/stdc++.h>
using namespace std;
int main(){
	string str;
	int num;
	cin >> num >> str;
	int j = 0;
	long long ac = 0;
	for(int i = str.size() - 1;i >= 0;i--){
		int u = 0;
		if(str[i] >= 'A' && str[i] <= 'Z'){
			u = str[i] - 'A';
			u += 10;
		}else if(str[i] > '0' && str[i] <= '9'){
			u = str[i] - '0';
		}
		if(str[i] != '0') ac += u * pow(num,j);
		j++;
	}
	cout << ac << endl;
	return 0;
} 


```cpp
#include <bits/stdc++.h>
using namespace std;
const int N = 100001;
long long n,sum,k=0;
string s;
int main(){
	cin>>n;//输入进制数 
	cin>>s;//输入具体的数字 
	for(int i=s.size()-1;i>=0;--i){
		if(s[i]>='A' and s[i]<='Z') sum+=(s[i]-55)*pow(n,k);
		else sum+=(s[i]-'0')*pow(n,k);
		k++;
	}
	cout<<sum;
    return 0;
}
```


不会的看我！！！

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