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Cod sursa(job #991441)
#include<fstream>
#include<cstring>
using namespace std;
int fr[256];
ifstream f("ordine.in"); ofstream g("ordine.out");
int main()
{ int n,i,w; char j,c,cv='A',s[1000002];
f>>s; n=strlen(s);
for(i=0;i<n;i++) fr[s[i]]++;
for(i=0;i<n;i++)
{ for(w=1,j='a';j<='z' && w;j++)
if(fr[j]==(n-i+1)/2+1) c=j, w=0;
for(j='a';j<='z' && w;j++)
if(fr[j] && j!=cv) c=j, w=0;
g<<c; fr[c]--; cv=c;
}
g<<"\n"; g.close(); return 0;
}