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Cod sursa(job #698434)
#include<fstream>
#include<string.h>
using namespace std;
ifstream f("litere.in");
ofstream g("litere.out");
int j[30],i,j2,n,v1[10005];
char v[10005];
int main()
{
f>>n;
f.get();
f.getline(v,10005);
for(i=0;i<n;i++)
{
j[v[i]-'a'+1]++;
v1[i]+=v1[i-1];
for(j2=v[i]-'a'+2;j2<='z'-'a'+1;j2++)
{
v1[i]+=j[j2];
}
}
g<<v1[n-1];
}