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package day259 | ||
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// GhostWinningLetterPlayerOne determine the letters the | ||
// first player should start with, such that with optimal | ||
// play they cannot lose. | ||
func GhostWinningLetterPlayerOne(dict []string) []rune { | ||
firstRuneAllEven := make(map[rune]bool) | ||
for _, word := range dict { | ||
runes := []rune(word) | ||
isEvenLength := len(runes)%2 == 0 | ||
firstRune := runes[0] | ||
if _, found := firstRuneAllEven[firstRune]; !isEvenLength { | ||
firstRuneAllEven[firstRune] = false | ||
} else if !found && isEvenLength { | ||
firstRuneAllEven[firstRune] = true | ||
} | ||
} | ||
var result []rune | ||
for r, valid := range firstRuneAllEven { | ||
if valid { | ||
result = append(result, r) | ||
} | ||
} | ||
return result | ||
} |
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package day259 | ||
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import ( | ||
"reflect" | ||
"testing" | ||
) | ||
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// nolint | ||
var testcases = []struct { | ||
dict []string | ||
result []rune | ||
}{ | ||
{[]string{"cat", "calf", "dog", "bear"}, []rune{'b'}}, | ||
{[]string{"cat", "calf", "dog", "bear", "pear", "pair"}, []rune{'b', 'p'}}, | ||
} | ||
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func TestGhostWinningLetterPlayerOne(t *testing.T) { | ||
t.Parallel() | ||
for _, tc := range testcases { | ||
if result := GhostWinningLetterPlayerOne(tc.dict); !reflect.DeepEqual(result, tc.result) { | ||
t.Errorf("Expected %v, got %v", string(tc.result), string(result)) | ||
} | ||
} | ||
} | ||
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func BenchmarkGhostWinningLetterPlayerOne(b *testing.B) { | ||
for i := 0; i < b.N; i++ { | ||
for _, tc := range testcases { | ||
GhostWinningLetterPlayerOne(tc.dict) | ||
} | ||
} | ||
} |