Created
May 23, 2017 14:22
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Using list of divisor
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public static int geometricTrickv2(String s){ | |
Set<Integer> indexA = new HashSet<>(s.length()); | |
Set<Integer> indexC = new HashSet<>(s.length()); | |
List<Integer> indexB = new ArrayList<>(); | |
for(int i=0;i<s.length();i++){ | |
if(s.charAt(i)=='a') | |
indexA.add(i); | |
if(s.charAt(i)=='b') | |
indexB.add(i); | |
if(s.charAt(i)=='c') | |
indexC.add(i); | |
} | |
int res = 0; | |
for(int tmpB:indexB){ | |
int powB = (int)Math.pow((double)(tmpB+1),2); | |
//Set<Integer> factors = new HashSet<>(); | |
for(int i=2;i<=Math.sqrt((double)powB);i++){ | |
if(powB%i==0){ | |
if(i != powB/i) | |
if(indexA.contains(i-1)&&indexC.contains(powB/i-1)) | |
res++; | |
if(indexC.contains(i-1)&&indexA.contains(powB/i-1)) | |
res++; | |
else | |
if(indexA.contains(i-1)&&indexC.contains(i-1)) | |
res++; | |
} | |
} | |
} | |
return res; | |
} |
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