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Cod sursa(job #267823)
#include <stdio.h>
char a[10001]
int v[130];
long n,i,j,s;
int main(){
FILE *f = fopen("litere.in", "r");
FILE *g = fopen("litere.out", "w");
fscanf(f,"%ld",&n);
fscanf(f,"%s",a);
for (i=0; i<n; i++) {
v[a[i]]++;
for (j=a[i]+1; j<='z'; j++)
s += v[j];
}
fprintf(g,"%ld",s);
fclose(f);
fclose(g);
return 0;
}