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input/code.cpp: In function 'int main()':
input/code.cpp:21:25: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
  fgets(s, 100000, stdin);
                         ^

#include <stdio.h>
#include <iostream>
#include <string>
#include <string.h>
#include <stdlib.h>

using namespace std;

unsigned long calculate();

struct Letters{
	int l[25];
};
Letters letters; 
char s[100000];
int main(void){
	
	int i = 25;
	while(i--) letters.l[i] = 0;
	
	fgets(s, 100000, stdin);
	int j;
	if (s[j = strlen(s) - 1] == '\n'){
		s[j] = '\0';
	}
	
	unsigned long sum = calculate();
	
	cout << sum;

	return 0;
	
}

unsigned long calculate(){
	
	unsigned int length = strlen(s);
	unsigned int l = length;
	
	unsigned int a = int('A');
	//while(i--) cout << "\n" << letters.l[i];
	
	while(l--) letters.l[(s[l] - a)]++;

	unsigned long sum = 0;
	unsigned long lsum;
	
	l = length;
	
	while (l--){
		if (letters.l[l]){
			lsum = letters.l[l] + 1;
			lsum = ((lsum*lsum) - lsum) / 2;
			sum += lsum;
		}
	}
		
	return sum;
}

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: RUNTIME ERROR

Test 7

Group: 2

Verdict: RUNTIME ERROR

Test 8

Group: 2

Verdict: RUNTIME ERROR

Test 9

Group: 2

Verdict: RUNTIME ERROR

Test 10

Group: 2

Verdict: RUNTIME ERROR

Test 11

Group: 3

Verdict: RUNTIME ERROR

Test 12

Group: 3

Verdict: RUNTIME ERROR

Test 13

Group: 3

Verdict: RUNTIME ERROR

Test 14

Group: 3

Verdict: RUNTIME ERROR

Test 15

Group: 3

Verdict: RUNTIME ERROR