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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4. int a[34],i;
  5.  
  6. a[0]=2;
  7. a[1]=-1;
  8.  
  9. for(i=0;i<32;i++){
  10. a[i+2]= -a[i+1]+a[i]+2;
  11. if(a[i+2]>5000){
  12. printf("%d %d番目",a[i+2],i+2);
  13. break;
  14. }
  15. }
  16. return 0;
  17. }
  18.  
Success #stdin #stdout 0s 5320KB
stdin
Standard input is empty
stdout
7754 18番目