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input/code.cpp: In function 'int main()':
input/code.cpp:23:18: warning: iteration 27u invokes undefined behavior [-Waggressive-loop-optimizations]
   int A = chars[k];
                  ^
input/code.cpp:21:2: note: containing loop
  for (int k = 0; k <= 27; k++)
  ^
input/code.cpp:13:25: warning: 'i' may be used uninitialized in this function [-Wmaybe-uninitialized]
   int i = (int)i - (int)'A';
                         ^

#include <iostream>

using namespace std;

int chars[27] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
bool hasValidData = true;
int output=0;

int main() {
	while (hasValidData) {
		char in = ' ';
		cin >> in;
		int i = (int)i - (int)'A';
		if (i <= 27 && i >= 0) {
			chars[i]++;
		}
		else {
			hasValidData = false;
		}
	}
	for (int k = 0; k <= 27; k++)
	{
		int A = chars[k];
		if ((A / 2) * 2 == A) {
			output += (A + 1)*(A / 2);
		}
		else {
			output += A*((A / 2) + 1);
		}
	}
	cout << output;
	return 0;
}

Test 1

Group: 1

Verdict: WRONG ANSWER

Test 2

Group: 1

Verdict: WRONG ANSWER

Test 3

Group: 1

Verdict: WRONG ANSWER

Test 4

Group: 1

Verdict: WRONG ANSWER

Test 5

Group: 1

Verdict: WRONG ANSWER

Test 6

Group: 2

Verdict: WRONG ANSWER

Test 7

Group: 2

Verdict: WRONG ANSWER

Test 8

Group: 2

Verdict: WRONG ANSWER

Test 9

Group: 2

Verdict: WRONG ANSWER

Test 10

Group: 2

Verdict: WRONG ANSWER

Test 11

Group: 3

Verdict: WRONG ANSWER

Test 12

Group: 3

Verdict: WRONG ANSWER

Test 13

Group: 3

Verdict: WRONG ANSWER

Test 14

Group: 3

Verdict: WRONG ANSWER

Test 15

Group: 3

Verdict: WRONG ANSWER