Submission #1540627

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Source Code Expand

#include<bits/stdc++.h>
#define int long long
#define P(x) cout << x << endl
#define D(x) P(#x << ": " << x)
#define F(i,n) for(int i = 0; i < (int)(n); ++i)
#define DEC(i,n) for(int i = (int)(n); --i >= 0;)
#define S(s) (int)((s).size())
#define ALL(v) v.begin(), v.end()
#define V vector
#define pb push_back
#define mt make_tuple
using namespace std;

signed main() {
	string s; cin >> s;
	int n = S(s);

	int cnt[26]; fill(cnt,cnt+26,0);
	F(i,n)
		++cnt[s[i]-'a'];
	int ans = 1;
	F(i,26) {
		for(int j = i+1; j < 26; ++j)
			ans += cnt[i] * cnt[j];
	}
	P(ans);
}

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