40 lines
644 B
Go
40 lines
644 B
Go
package day06
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import "math/bits"
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type Solver struct {
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inputLine []byte
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}
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func (s *Solver) ParseInput(input []string) {
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s.inputLine = []byte(input[0])
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}
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func (s *Solver) solve(numNeeded int) any {
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for i := numNeeded - 1; i < len(s.inputLine); i++ {
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var seenMap uint32
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for j := i - numNeeded + 1; j <= i; j++ {
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bitValue := uint32(1 << (s.inputLine[j] - 'a'))
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if seenMap&bitValue > 0 {
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break
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}
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seenMap |= bitValue
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}
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if bits.OnesCount32(seenMap) == numNeeded {
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return i + 1
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}
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}
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return -1
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}
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func (s *Solver) SolvePart1() any {
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return s.solve(4)
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}
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func (s *Solver) SolvePart2() any {
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return s.solve(14)
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}
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