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49.java
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58 lines (33 loc) · 804 Bytes
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class Solution {
public int nthUglyNumber(int n) {
int count1=0,count2=0,count3=0;
int ugly[] = new int[n];
int i=1;
if(n==0)
{
return 0;
}
ugly[0]=1;
while(i<n)
{
int min = Math.min(ugly[count1]*2,ugly[count2]*3);
min = Math.min(min,ugly[count3]*5);
ugly[i] = min;
if(ugly[count1]*2==ugly[i])
{
++count1;
}
if(ugly[count2]*3==ugly[i])
{
++count2;
}
if(ugly[count3]*5==ugly[i])
{
++count3;
}
// System.out.print(ugly[i]+" ");
++i;
}
return ugly[i-1];
}
}