hdoj 2817 A sequence of numbers【快速幂】
A sequence of numbers
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 4384 Accepted Submission(s):
1374
ago, they might be arithmetic or geometric sequences. The numbers are not very
clear now, and only the first three numbers of each sequence are recognizable.
Xinlv wants to know some numbers in these sequences, and he needs your
help.
there are N sequences. Each of the following N lines contain four integers. The
first three indicating the first three numbers of the sequence, and the last one
is K, indicating that we want to know the K-th numbers of the
sequence.
You can assume 0 < K <= 10^9, and the other three numbers
are in the range [0, 2^63). All the numbers of the sequences are integers. And
the sequences are non-decreasing.
number module (%) 200907.
#include<stdio.h>
#include<string.h>
#include<algorithm>
#define LL long long
#define mod 200907
using namespace std;
LL fun(LL a,LL b)
{
LL ans=1;
//a=a%mod;
while(b)
{
if(b&1)
ans=(a*ans)%mod;
b/=2;
a=(a*a)%mod;
}
return ans;
}
int main()
{
int t;
LL x,y,x1,y1;
LL a,b,c,k;
LL ans;
scanf("%d",&t);
while(t--)
{
scanf("%lld%lld%lld%lld",&a,&b,&c,&k);
if(2*b==a+c)//等差数列
printf("%lld\n",(a+(c-b)*(k-1))%mod);
else //等比数列
printf("%lld\n",(((fun((c/b),k-1))%mod)*(a%mod))%mod);
}
return 0;
}
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