题解

#include <bits/stdc++.h>
using namespace std;
string s,ans;
int len;
int main()
{
	getline(cin,s);
	len=s.size();
	for(int i=0;i<=len-1;++i)
	{
		if(s[i]==' ' and s[i+1]==' ')
		{
			continue;
		}
			ans+=s[i];
		
	 } 
	 cout<<ans;
    return 0;
}