Osajono

input/code.cpp: In function 'int main()':
input/code.cpp:16:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%s", buf);
                     ^

/* Osajono.cpp -- Datatahti 2016 tehtava osajono
 *
 * Eetu "Razbit" Pesonen, 2015
 */

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

using namespace std;

int main()
{
    // Max input string length 10^5
    char* buf = (char*)malloc(100001 * sizeof(char));
    scanf("%s", buf);

    // for counting occurences
    int* table = (int*)malloc(256 * sizeof(int));
    memset(table, 0, 256);
    
    // Even one character counts as a substr
    int num = strlen(buf);

    // Count occurences of each char in the string
    for(unsigned int i = 0; i < strlen(buf); i++)
    {
        table[(int)buf[i]] += 1;
    }

    int n;
    for(unsigned int i = 0; i < 256; i++)
    {
        n = table[i];
        if (n)
            num += (n*n-n)/2;
    }

    printf("%i\n", num);
    
    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: WRONG ANSWER

Test 12

Group: 3

Verdict: ACCEPTED

Test 13

Group: 3

Verdict: WRONG ANSWER

Test 14

Group: 3

Verdict: WRONG ANSWER

Test 15

Group: 3

Verdict: WRONG ANSWER