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  1. #include <stdio.h>
  2.  
  3. f(x){return(x&~0U/3*2)/2+(x&~0U/3)*2;}
  4.  
  5. int main (int argc, char **argv) {
  6.     int i;
  7.     int testcases[] = {0, 1, 9, 85, 220, 1827, 47525};
  8.  
  9.     for (i = 0; i < (sizeof(testcases) / sizeof(testcases[0])); i++) {
  10.         printf("f(%d)=%d\n", testcases[i], f(testcases[i]));
  11.     }
  12.     return 0;
  13. }
  14.  
Success #stdin #stdout 0s 2156KB
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stdin
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Standard input is empty
stdout
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f(0)=0
f(1)=2
f(9)=6
f(85)=170
f(220)=236
f(1827)=2835
f(47525)=30298
https://ideone.com/5HOmv7
language:
C (gcc 8.3)
created:
7 years ago
visibility:
public

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