freecodecamp--freecodecamp/curriculum/challenges/english/blocks/daily-coding-challenges-python/6a151d32d772271dd2448c2d.md

id, title, challengeType, dashedName

id	title	challengeType	dashedName
6a151d32d772271dd2448c2d	Challenge 311: Spellcaster	29	challenge-311

--description--

Given a string of spell codes you are casting, calculate the total score.

Each character in the string represents a spell:

Code	Spell	Category	Base Score
"f"	Fire	Destruction	3
"l"	Lightning	Destruction	3
"i"	Ice	Control	2
"w"	Wind	Control	2
"h"	Heal	Restoration	1
"s"	Shield	Restoration	1

A combo multiplier is applied based on how many spells in a row have been cast from different categories:

• The first spell always scores at base value.
• Each consecutive spell from a different category than the previous increases the multiplier by 1.
• Casting a spell from the same category as the previous resets the multiplier back to 1.
• The score for each spell is its base score multiplied by the current multiplier.

Return the total score from the sequence of spells.

--hints--

cast("fihwl") should return 33.

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(cast("fihwl"), 33)`)
}})

cast("lwswfi") should return 45.

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(cast("lwswfi"), 45)`)
}})

cast("wislhfl") should return 37.

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(cast("wislhfl"), 37)`)
}})

cast("sihwlih") should return 50.

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(cast("sihwlih"), 50)`)
}})

cast("wishlfihwslwifihl") should return 101.

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(cast("wishlfihwslwifihl"), 101)`)
}})

--seed--

--seed-contents--

def cast(spells):

    return spells

--solutions--

def cast(spells):
    lookup = {
        "f": ("destruction", 3),
        "l": ("destruction", 3),
        "i": ("control", 2),
        "w": ("control", 2),
        "h": ("restoration", 1),
        "s": ("restoration", 1)
    }

    total = 0
    multiplier = 1
    prev_category = None

    for spell in spells:
        category, score = lookup[spell]

        if prev_category and category != prev_category:
            multiplier += 1
        else:
            multiplier = 1

        total += score * multiplier
        prev_category = category

    return total