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Commit5b298ca

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Create 1888-minimum-number-of-flips-to-make-the-binary-string-alternating.kt
1 parent04c8d7f commit5b298ca

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/*
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* O(N) memory
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*/
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funminFlips(s:String):Int {
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var s2= s+ s
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var sb1=StringBuilder()
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var sb2=StringBuilder()
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for (iin0 until s2.length) {
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if (i%2==0) {
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sb1.append('1')
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sb2.append('0')
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}else {
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sb1.append('0')
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sb2.append('1')
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}
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}
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val alt1= sb1.toString()
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val alt2= sb2.toString()
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var res= s2.length
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var diff1=0
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var diff2=0
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var left=0
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for (rightin0 until s2.length) {
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if (s2[right]!= alt1[right])
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diff1++
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if (s2[right]!= alt2[right])
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diff2++
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if (right- left+1> s.length) {
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if (s2[left]!= alt1[left])
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diff1--
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if (s2[left]!= alt2[left])
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diff2--
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left++
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}
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if (right- left+1== s.length)
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res= minOf(res, diff1, diff2)
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}
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return res
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}
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}
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/*
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* O(1) memory
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*/
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classSolution {
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funminFlips(s:String):Int {
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val n= s.length
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var diff1=0
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var diff2=0
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var res= n
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for (iin0 until n*2) {
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val sChar= s[i% n]
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val is0=if (i%2==0)'0'else'1'
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if (sChar!= is0)
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diff1++
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else
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diff2++
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if (i>= n) {
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val firstCharInWindow=if ((i- n)%2==0)'0'else'1'
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if (firstCharInWindow!= s[i- n])
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diff1--
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else
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diff2--
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res= minOf(res, diff1, diff2)
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}
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}
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return res
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}
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}

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