Osajono

input/code.cpp: In function 'int main()':
input/code.cpp:13:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 for(int i = 0; i < s.length(); ++i) {
                             ^

#include <iostream>
#include <string>

using namespace std;
typedef long long ll;

string s;
ll cnt[30];
ll res;

int main() {
cin>>s;
for(int i = 0; i < s.length(); ++i) {
cnt[s[i]-'A']++;
}
for (int i = 0; i < 30; ++i) {
res += cnt[i] + cnt[i]*(cnt[i]-1)/2;
}
cout<<res<<"\n";
}

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