蓝桥练习系统，K好数，代码如下，只得了十分，求解问题出在哪

#include <iostream>
#include<stdlib.h>
/* run this program using the console pauser or add your own getch, system("pause") or input loop */
using namespace std;

int main(int argc, char** argv) {
int k,l;
long long a[101][101]={0};
long long sum =0;
cin>>k>>l;
for(int i=0;i<k;i++){
a[1][i] = 1 ;
}
for(int i=2;i<=l;i++){
for(int j=0;j<k;j++){
for(int m=0;m<k;m++){
if(abs(j-m)!=1){
cout<<j<<endl;
a[i][j] += a[i-1][m]%1000000007;
a[i][j] %=1000000007;
}
}
}
}
for(int i=1;i<k;i++){
sum = sum+a[l][i]%1000000007;
sum %= 1000000007;
}
cout<<(sum%1000000007)<<endl;
return 0;
}