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Cod sursa(job #343971)
#include<stdio.h>
#include<string.h>
int a[26] , n , i , nr , u ;
int main ()
{
freopen("ordine.in","r",stdin);
freopen("ordine.out","w",stdout);
char k;
u=-1;
while(scanf("%c",&k)==1)
if('a'<=k && 'z'>=k)
{
nr++;
a[k-'a']++;
}
int o=nr;
for( int p=0 ; p<=nr ; p++)
{int el=-1;
for( i=0 ; i<=25 ; i++ )
if(a[i]>o/2 && u!=i)
{
printf("%c",i+'a',i),a[i]--,u=i,o--;
el=0;
break;
}
if(el==0)
continue;
for( i=0 ; i<=25 ; i++ )
if(a[i] && u!=i)
{
printf("%c",i+'a'),a[i]--,u=i,o--;
break;
}
}
printf("\n");
return 0;
}