#include<stdio.h>

int main() {

int n,a[10000007];

scanf("%d",&n);

a[1]=1,a[2]=1;

if(n= =1 || n= =2){printf("1");}

else {

for(int i=3;i<=n;i++)

{

a[i]=a[i-1]%10007+a[i-2]%10007;

}

printf("%d",a[n]%10007);

}

return 0;

}

#include<stdio.h>
int main(){
int f1=1,f2=1;
int fn;
int sum = 0;
scanf("%d",&fn);
if(fn<3){
printf("1");
}
else{
for(int i=3; i<=fn; i++){
sum = (f1+f2)%10007;
f1 = f2;
f2 = sum;
}
printf("%d",sum);
}
return 0;
}

(新手，基本知识全忘了，开始凭感觉写)
查了一下好像不能直接用变量定义a[n] 
但不知道为什么这么写，也没出错，全过了...

定义的时候，把数组中的n改成一个较大的值如100000，也可以全过
---

#include<bits/stdc++.h>
#include<cmath>
using namespace std;

int main(){
	int n;
	cin>>n;
	int a[n];
	a[0]=1;a[1]=1;
	for(int i=2;i<n;i++){
		a[i]=a[i-1]%10007+a[i-2]%10007;
	}
	cout<<a[n-1]%10007;
	return 0;
}

C++

用递推写了一个，怕超时

#include <iostream>
using namespace std;
int main()
{
    int d1=1,d2=1,d3;
    int n = 0;
    cin >> n;
    int i = 2;
    if(n <= 2)  cout << d1 << endl;
    else
    {
        while(i < n)
        {
            d3 = (d1+d2)%10007;
            d1 = d2;
            d2 = d3; 
            i++;
        }
        cout << d3 << endl;
    }
    return 0;
}

#include<stdio.h> int main() { int x, y; int num[20]; num[0] = 1; num[1] = 1; scanf_s("%d",&x); for (y=1;y<=x;y++) { num[y + 1] = num[y - 1] + num[y];

}
printf("%d",num[x-1]);
return 0;

}

#include<stdio.h> int main() { int x, y; int num[20]; num[0] = 1; num[1] = 1; scanf_s("%d",&x); for (y=1;y<=x;y++) { num[y + 1] = num[y - 1] + num[y];

}
printf("%d",num[x-1]);
return 0;

}

#include<stdio.h> int fb(int x) { int t,t1=1,t2=1; if(x1) return 1; else if(x2) return 1; else { for(int i=2;i<x;i++) { t=(t1+t2)%10007; t1=t2; t2=t; } return t; } } int main() { long long m; scanf("%d",&m); printf("%d",fb(m)); return 0; }

#include <stdio.h>
#pragma warning (disable:4996)

int main() {
    int n;
    scanf("%d", &n);
    long long a = 0, b = 1, c;
    for (int i = 2; i <= n; i++) 
    {
        c = (a + b) % 10007;
        a = b;
        b = c;
    }
    printf("%lld", b);
        return 0;
}

#include <stdio.h>
#include <algorithm>
#include <math.h>
#include <vector>
using namespace std;
vector<int> a;
int main() {
    int n,i=1;
    a.push_back(1);
    a.push_back(1);
    scanf("%d",&n);
    if(n==1||n==2)
    {
        printf("1\n");
        return 0;
    }
    for(int i=2;i<n;i++)
    {
        int tmp=(a[i-1]%10007+a[i-2]%10007)%10007;
        a.push_back(tmp);
    }
    printf("%d\n",a[n-1]);
    return 0;
}