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  1. #include <stdio.h>
  2. #include <time.h>
  3. #include <stdlib.h>
  4. int Fib(int n){
  5.     if(n==0) return 0;
  6.     int a[n+1];
  7.     a[0]=0;
  8.     a[1]=1;
  9.     for(int i=2;i<=n;i++){
  10.         a[i]=a[i-2]+a[i-1];
  11.     }
  12.     return a[n];
  13. }
  14. int Fib1(int n){
  15.     if(n==0){
  16.         return 0;
  17.     }else if(n==1){
  18.         return 1;
  19.     }else{
  20.         return Fib1(n-2)+Fib1(n-1);
  21.     }
  22. }
  23. int main(){
  24. 	clock_t ti[3];
  25. 	ti[0] = clock();
  26. 	printf("%d\n",Fib(20));
  27. 	ti[1] = clock();
  28. 	printf("Fib(20)の時間= %d\n", ti[1]-ti[0]);
  29.     printf("%d\n",Fib1(20));
  30. 	ti[2] = clock();
  31. 	printf("Fib1(20)の時間= %d\n", ti[2]-ti[1]);
  32.     return 0;
  33. }
Success #stdin #stdout 0.01s 5320KB
comments (?)
stdin 
Standard input is empty
stdout 
6765
Fib(20)の時間= 0
6765
Fib1(20)の時間= 0
https://ideone.com/OmjztY
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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