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1、
2、题目大意:
Description
A number sequence is defined as follows:
f(1) = 1, f(2) = 1, f(n) = (A * f(n - 1) + B * f(n - 2)) mod 7. Given A, B, and n, you are to calculate the value of f(n).Input
Output
Sample Input
Sample Output
3、ac代码:
#includeint f[1000]={0,1,1};int main(){ int a,b,n; while(scanf("%d%d%d",&a,&b,&n)!=EOF) { if(a==0 && b==0 && n==0) break;// f[0]=0;// f[1]=1;// f[2]=1; int flag; for(int i=3;i<=1000;i++) { f[i]= (a * f[i - 1] + b * f[i - 2])%7; if(f[i]==f[i-1]) { flag=i-2; //break; } } printf("%d\n",f[n%flag]); } return 0;}
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