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Cod sursa(job #991444)
#include<fstream>
#include<cstring>
using namespace std;
int fr[26];
ifstream f("ordine.in"); ofstream g("ordine.out");
int main()
{ int n,i,j,w,c,cv=-1; char s[1000002];
f>>s; n=strlen(s);
for(i=0;i<n;i++) fr[s[i]-'a']++;
for(i=0;i<n;i++)
{ for(w=1,j=0;j<26 && w;j++)
if(fr[j]==(n-i+1)/2+1) c=j, w=0;
for(j=0;j<26 && w;j++)
if(fr[j] && j!=cv) c=j, w=0;
g<<char(c+'a'); fr[c]--; cv=c;
}
g<<"\n"; g.close(); return 0;
}