#include<bits/stdc++.h>
using namespace std;
int n,r;

char zh(int x,int y){
	if(x/y==0){
		return 0;
	}
	int ans=x%y;
	if(ans<0){
		ans=ans-y;
		x=x+y;
	}
	zh(x/y,y);
	if(ans<=9){
		cout<< ans;
	}else{
		cout<< char (ans+'A'-10);
	}
	
}

int main(){
	cin>>n>>r;
	cout<<n<<"=";
	if(n==0){
		cout<<"0(base"<<r<<")"<<endl;
		return 0;
	}
	zh(n,r);
	cout<<"(base"<<r<<")"<<endl;
	return 0;
}

输入#1时
我的输出是

30000=011010101110000(base-2)

剩下几个也一样。 大佬帮忙看看呗。WAW