Fibonacci Again
Time Limit : 2000/1000ms (Java/Other) Memory Limit : 65536/32768K (Java/Other)
Total Submission(s) : 8 Accepted Submission(s) : 3
Print the word "no" if not.
1
2
3
4
5
no
yes
no
no
no
#include<stdio.h>
int f[1000001];
int main()
{
int n,i;
while(scanf("%d",&n)!=EOF)
{
f[0]=7,f[1]=11;
if(n==0||n==1)
printf("no\n");
else
{
for(i=2;i<=1000000;i++)
f[i]=(f[i-1]%3+f[i-2]%3)%3;
if(f[n]==0)
printf("yes\n");
else
printf("no\n");
}
}
return 0;
}
余数里面的一条公式:(a+b)%3 = (a%3+b%3)%3
Wrong Answer:
#include<stdio.h>
int f[1000000];
int main()
{
int n,i;
while(scanf("%d",&n)!=EOF)
{
if(n==0||n==1)
printf("no\n");
else
{
f[0]=7,f[1]=11;
for(i=2;i<=n;i++)
f[i]=f[i-1]+f[i-2];
if(f[n]%3==0)
printf("yes\n");
else
printf("no\n");
}
}
return 0;
}