Osajono

#include <iostream>
#include <string>
typedef long long ll;
int main() {
    std::string x;
    std::cin >> x;
    ll len = x.length();
    if (len==0) {
        std::cout << 0 << std::endl;
    }
    // let teh complier optimize :]
    char C[26] = {0};
    char G[26] = {0};
    ll s=0;
    for(long w=0;w<len;++w){++C[x[w]-0x41];}
    for(long w=0;w<len;++w){s+=(C[x[w]-0x41]-G[x[w]-0x41]);++G[x[w]-0x41];}
    std::cout << s << std::endl;
    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: 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