include

include

include

include

include

include

include

include

include

include

char* readline(); char* ltrim(char*); char* rtrim(char*);

int parse_int(char*);

/* * Complete the 'solve' function below. * * The function is expected to return a DOUBLE. * The function accepts STRING s as parameter. / bool is_palindrome(const char s){ int n=strlen(s); for(int i=0;i

int min_swaps_to_palindrome(char* s){ int n=strlen(s); int swaps=0;

for(int i=0;i<n/2;++i) {
    int left = i;
    int right = n-left-1;

    while(left<right && s[left] != s[right]){
        right--;
        }
    if (left==right) {
        if(n % 2== 1) {
    for (int j=right;j<n-left-1;++j) {
        char temp = s[j];
        s[j]=s[j+1];
        s[j+1]=temp;
        swaps++;
    } continue;
        } else {
                return -1;
            }
        } else {
                for (int j=right;j<n-left-1;++j) {
                    char temp =s[j];
                    s[j]=s[j+1];
                    s[j+1]=temp;
                    swaps++;
                }
            }
} 
return swaps;

}

double solve(char* s) { if(is_palindrome(s)) { return 0.0; } int min_swaps=min_swaps_to_palindrome(s); if(min_swaps == -1) { return (double)INT_MAX; } return(double)min_swaps; }

int main() { FILE* fptr = fopen(getenv("OUTPUT_PATH"), "w");

int t = parse_int(ltrim(rtrim(readline())));

for (int t_itr = 0; t_itr < t; t_itr++) {
    char* s = readline();

    double result = solve(s);

    fprintf(fptr, "%lf\n", result);
}

fclose(fptr);

return 0;

}

char* readline() { size_t alloc_length = 1024; size_t data_length = 0;

char* data = malloc(alloc_length);

while (true) {
    char* cursor = data + data_length;
    char* line = fgets(cursor, alloc_length - data_length, stdin);

    if (!line) {
        break;
    }

    data_length += strlen(cursor);

    if (data_length < alloc_length - 1 || data[data_length - 1] == '\n') {
        break;
    }

    alloc_length <<= 1;

    data = realloc(data, alloc_length);

    if (!data) {
        data = '\0';

        break;
    }
}

if (data[data_length - 1] == '\n') {
    data[data_length - 1] = '\0';

    data = realloc(data, data_length);

    if (!data) {
        data = '\0';
    }
} else {
    data = realloc(data, data_length + 1);

    if (!data) {
        data = '\0';
    } else {
        data[data_length] = '\0';
    }
}

return data;

}

char* ltrim(char* str) { if (!str) { return '\0'; }

if (!*str) {
    return str;
}

while (*str != '\0' && isspace(*str)) {
    str++;
}

return str;

}

char* rtrim(char* str) { if (!str) { return '\0'; }

if (!*str) {
    return str;
}

char* end = str + strlen(str) - 1;

while (end >= str && isspace(*end)) {
    end--;
}

*(end + 1) = '\0';

return str;

}

int parse_int(char* str) { char* endptr; int value = strtol(str, &endptr, 10);

if (endptr == str || *endptr != '\0') {
    exit(EXIT_FAILURE);
}

return value;

} where is the issue