Osajono

input/code.cpp: In function 'int main()':
input/code.cpp:12:5: error: 'string' is not a member of 'std'
     std::string syote;
     ^
input/code.cpp:14:14: error: 'syote' was not declared in this scope
     if(fgets(syote, sizeof(syote), stdin) != 0)
              ^

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

int summa(int i)
{
    return i > 0 ? i + summa(i - 1) : 0;
}

int main()
{
    int i, j, k, tuloste = 0;
    std::string syote;

    if(fgets(syote, sizeof(syote), stdin) != 0)
    {
        for(i = 'A'; i < 'Z'; i++)
        {
            k = 0;
            for(j = 0; syote[j] != 0; j++)
                if(syote[j] == i || syote[j] == i + 32)
                    k++;

            tuloste += summa(k);
        }
    }

    printf("%u\n", tuloste);
    return 0;
}