Kamal Nayan
BAN USER
Sorry, Ignore my last comment. It was my first answer in careercup. It was showing error message, so I have added comment in all lines.
Please use this one:
my $str = 'abababaabbbaaaaa';
# a1b1a1b1a1b1a2b3a5
my @str = split '', $str;
my $op = '';
my $cnt = 1;
for my $i (0 .. length($str)) {
if ($str[$i] eq $str[$i+1]) {
$cnt++;
} else {
$op .= $str[$i].$cnt;
$cnt = 1;
}
}
print $op;
Solution in perl:
my $str = "Featuring stylish rooms and moorings for recreation boats, Room Mate Aitana is a designer hotel built in 2013 on an island in the IJ River in Amsterdam.";
my @res = ();
for my $word (split '\s+', $str) {
if (length (join ' ', @res) + (length $word) + 1 > 30) {
last;
} else {
push @res, $word;
}
}
print join ' ', @res;
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Mysql solution in ANSI syntax:
1. how do you get the countries that has no cities?
SELECT country.countryid, country_name FROM country LEFT JOIN city ON city.countryid = country.countryid WHERE city.city_name IS NULL OR city_name = ''2. how do you get the countries that has less than 3 cities and also make sure the countries with no cities also show up.
- Kamal Nayan December 15, 2016SELECT country.countryid, country_name, count(1) cnt FROM country LEFT JOIN city ON city.countryid = country.countryid GROUP BY country.countryid HAVING cnt < 3;