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Cod sursa(job #902827)
#include <fstream>
using namespace std;
char s[1000005],ant=-1;
int size,f[30];
int main()
{
freopen("ordine.in","r",stdin);
freopen("ordine.out","w",stdout);
gets(s);
for(int i=0;s[i];i++,size++)
++f[s[i]-'a'];
for(int i=1;i<=size;i++)
{
int c=-1;
for(int j=0;j<26;j++)
if(ant!=j && f[j]==(size-i+1)/2+1)
{
c=j;
break;
}
if(c!=-1)
{
printf("%c",char(c + 'a'));
--f[c];
ant=c;
}
else
for(int j=0;j<26;j++)
if(ant!=j && f[j])
{
printf("%c",char(j+'a'));
f[j]--;
ant=j;
break;
}
}
return 0;
}