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Cod sursa(job #109835)
#include<stdio.h>
int s[26];
int main(){
int n,i,j=-1,k=0;
char c,t[26];
freopen("ordine.in","r",stdin);
freopen("ordine.out","w",stdout);
for (c='a';c<='z';++c){
++j;
t[j]=c;
}
while (!feof(stdin)){
scanf("%c",&c);
++(s[c-'a']);
++k;
}
--s[c-'a'];--k;i=0;
while (k>0){
while (s[i]==0 && i<=26)
++i;
if (i==c){
++i;
while (s[i]==0 && i<=26)
++i;
}
printf("%c",t[i]);
--s[i];++i;--k;
if (k==0)
return 0;
while (s[i]==0 && i<=26)
++i;
printf("%c",t[i]);
--s[i];c=i,i=0;--k;
}
//for (i=0;i<27;++i)
//printf("%d ",s[i]);
fclose(stdin);
fclose(stdout);
return 0;
}