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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4. 	int a[30],n,i;
  5. 	i=0;
  6. 	a[0]=2;
  7. 	a[1]=-1;
  8. 	for(n=2;n<30;n++){
  9. 		a[n]=-a[n-1]+a[n-2]+2;}
  10. 	while(a[i]<5000){
  11. 		i++;
  12. 	}
  13. printf("%d項目 %d",i,a[i]);
  14. 	return 0;
  15. }
  16.  
Success #stdin #stdout 0s 5284KB
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Standard input is empty
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18項目 7754
https://ideone.com/LwI1I9
language:
C (gcc 8.3)
created:
45 days ago
visibility:
public

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