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  1. #include<stdio.h>
  2. #include<stdlib.h>
  3.  
  4. unsigned int min(unsigned int a, unsigned int b, unsigned int c)
  5. {
  6. 	if(a<b && a<c)
  7. 		return a;
  8. 	else if(b<c)
  9. 		return b;
  10. 	else
  11. 		return c;
  12. }
  13.  
  14. unsigned int nthUgly(unsigned int n) 
  15. { 
  16.     unsigned int dp[n]; // To store ugly numbers 
  17.     unsigned int p2 = 0, p3 = 0, p5 = 0;
  18.     unsigned int next_ugly;
  19.  
  20.     dp[0] = 1; 
  21.     for (int i=1; i<n; i++) 
  22.     { 
  23. 		next_ugly = min(dp[p2] * 2, dp[p3] * 3, dp[p5] * 5); 
  24. 		dp[i] = next_ugly; 
  25. 		if (next_ugly == dp[p2]*2)
  26. 			p2 = p2+1; 
  27. 		if(next_ugly == dp[p3]*3)
  28. 			p3 = p3+1;
  29. 		if(next_ugly == dp[p5]*5)
  30. 			p5 = p5+1;
  31.     } 
  32.     return next_ugly; 
  33. } 
  34.  
  35.  
  36. int main() 
  37. { 
  38.     unsigned int n;
  39.     scanf("%d", &n);
  40.     printf("%d", nthUgly(n)); 
  41.     return 0; 
  42. }
Success #stdin #stdout 0s 9424KB
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https://ideone.com/3ZEX8Q
language:
C (gcc 8.3)
created:
6 years ago
visibility:
secret

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