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Cod sursa(job #191407)
#include <cstdio>
char a[10100];
int main(){
freopen("litere.in", "r", stdin);
freopen("litere.out", "w", stdout);
unsigned n, sol = 0;
scanf("%d\n", &n);
gets(a);
for (unsigned i=0; i<sizeof(a); i++)
a[i] = 'z'+1;
for (unsigned i=0; i<n; i++)
for (unsigned j=i+1; j<10000; j++)
if (a[i] > a[j]) sol++;
printf("%d\n", sol);
}