That's what arrays and loops are for!
my @c = split /,/, $hand;
my $total = 0;
# 2 cards
for my $i1 (0..4) {
for my $i2 ($i1+1..4) {
$total += 2 if $c[$i1] + $c[$i2] == 15;
}
}
# 3 cards
for my $i1 (0..4) {
for my $i2 ($i1+1..4) {
for my $i3 ($i2+1..4) {
$total += 2 if $c[$i1] + $c[$i2] + $c[$i3] == 15;
}
}
}
...
But we can do better.
my @c = split /,/, $hand;
my $total = 0;
for my $i1 (0..4) {
for my $i2 ($i1+1..4) {
$total += 2 if $c[$i1] + $c[$i2] == 15;
for my $i3 ($i2+1..4) {
$total += 2 if $c[$i1] + $c[$i2] + $c[$i3] == 15;
for my $i4 ($i3+1..4) {
$total += 2 if $c[$i1] + $c[$i2] + $c[$i3] + $c[$i
+4] == 15;
for my $i5 ($i4+1..4) {
$total += 2 if $c[$i1] + $c[$i2] + $c[$i3] + $
+c[$i4] + $c[$i5] == 15;
}
}
}
}
}
Let's go further:
my @c = split /,/, $hand;
my $total = 0;
our $sum;
for my $i1 (0..4) {
local $sum = $i1;
for my $i2 ($i1+1..4) {
local $sum = $sum + $c[$i2]];
$total += 2 if $sum == 15;
for my $i3 ($i2+1..4) {
local $sum = $sum + $c[$i3];
$total += 2 if $sum == 15;
for my $i4 ($i3+1..4) {
local $sum = $sum + $c[$i4];
$total += 2 if $sum == 15;
for my $i5 ($i4+1..4) {
local $sum = $sum + $c[$i5];
$total += 2 if $sum == 15;
}
}
}
}
}
Let's add optimizations:
my @c = split /,/, $hand;
my $total = 0;
our $sum;
for my $i1 (0..4) {
local $sum = $i1;
for my $i2 ($i1+1..4) {
local $sum = $sum + $c[$i2]];
$total += 2 if $sum == 15;
next if $sum >= 15;
for my $i3 ($i2+1..4) {
local $sum = $sum + $c[$i3];
$total += 2 if $sum == 15;
next if $sum >= 15;
for my $i4 ($i3+1..4) {
local $sum = $sum + $c[$i4];
$total += 2 if $sum == 15;
next if $sum >= 15;
for my $i5 ($i4+1..4) {
local $sum = $sum + $c[$i5];
$total += 2 if $sum == 15;
}
}
}
}
}
While I eliminated a lot of redundancy both visually and in the number of checks, I'm sure there's still a better *algorithm*.
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