本地能过 落谷IDE没输出？？？

CODE:

#include<bits/stdc++.h>
using namespace std;
int k,to,f=1;
char c;
long long s;
string st;
int main()
{
	cin>>k;
	c=getchar();
	while(c=getchar())
	{
		//cout<<s;
	if('0'<=c && c<='9') s=s*k+c-'0';
	else if('A'<=c && c<='F') s=s*k+c-'A'+10;
	else if(c=='-') f=-1;
	else break;	
	} 
	cin>>to;
	while(s)
	{
		int x=s%to;
		if(10<=x) st=char(x+'A'-10)+st;
		else st=char(x+'0')+st;
		s/=to; 
	}
	if(f==-1) cout<<'-';
    cout<<st;
return 0;
}