Osajono

input/code.cpp: In function 'int main()':
input/code.cpp:15:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int64_t i=0;i<s.size();i++) {
                    ^

#include<iostream>
#include<vector>
#include<map>
#include<set>
#include<algorithm>
#include<cmath>
#include<utility>

using namespace std;

int main(void) {
  string s;
  cin >> s;
  int64_t counts[26]={0};
  for(int64_t i=0;i<s.size();i++) {
    counts[s[i]-'A']++;
  }
  int64_t total=s.size();
  for(int64_t i=0;i<26;i++) {
    total+=counts[i]*(counts[i]-1)/2;
  }
  cout << total << '\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: ACCEPTED

Test 12

Group: 3

Verdict: ACCEPTED

Test 13

Group: 3

Verdict: ACCEPTED

Test 14

Group: 3

Verdict: ACCEPTED

Test 15

Group: 3

Verdict: ACCEPTED