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- #include<bits/stdc++.h>
- using namespace std;
- #define ll long long
- int main()
- {
- ll b,c=0,i,j,k;
- string a;
- cin>>b;
- cin>>a;
- for(i=0;i<b;i++)
- {
- for(j=i+1;j<b;j++)
- {
- for(k=j+1;k<b;k++)
- {
- if(a[i]!=a[j] && a[i]!=a[k] && a[j]!=a[k] && (j-i)!=(k-j))
- {
- c++;
- }
- }
- }
- }
- printf("%lld\n",c);
- return 0;
- }
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