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input/code.cpp: In function 'int main()':
input/code.cpp:8:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < j.length(); i++) {
                    ^
input/code.cpp:7:6: warning: unused variable 'i' [-Wunused-variable]
  int i = 0;
      ^

#include <iostream>
#include <string>
int main() {
	std::string j;
	std::cin >> j;
	int chars[26] = { 0 };
	int i = 0;
	for (int i = 0; i < j.length(); i++) {
		chars[int(j[i]) - 65]++;
	}
	int ans = 0;
	for (int i = 0; i < 26; i++) {
		int cn = chars[i];
		ans += cn;
		if (cn > 3) {
			int c = cn - 1;
			ans += (c * (c + 1)) / 2;
		}
		else if (cn > 0) {
			if (cn == 2) ans++;
			else if (cn == 3) ans += 3;
		}
	}
	std::cout << ans << "\n";
	return 0;
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: ACCEPTED

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: ACCEPTED

Test 5

Group: 1

Verdict: ACCEPTED

Test 6

Group: 2

Verdict: ACCEPTED

Test 7

Group: 2

Verdict: ACCEPTED

Test 8

Group: 2

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: ACCEPTED

Test 10

Group: 2

Verdict: ACCEPTED

Test 11

Group: 3

Verdict: WRONG ANSWER

Test 12

Group: 3

Verdict: ACCEPTED

Test 13

Group: 3

Verdict: WRONG ANSWER

Test 14

Group: 3

Verdict: WRONG ANSWER

Test 15

Group: 3

Verdict: WRONG ANSWER