不知道为啥，下载的#1在本机一输入n和k就RE了，提交全WA

#include<iostream>
using namespace std;
const int mod=1e9+7;
int n,k;
struct matrix{
	long long num[105][105]={0};
	matrix operator*(const matrix b)const{
		matrix c;
		for(int k=1;k<=n;k++){
			for(int i=1;i<=n;i++){
				for(int j=1;j<=n;j++){
					c.num[i][j]+=(num[i][k]*b.num[k][j]%mod)%mod;
				}
			}
		}
		return c;
	}
};
matrix a,ans,dw;
matrix ksm(matrix x,int k){
	if(k==0)return dw;
	if(k==1)return x;
	matrix t=ksm(x,k/2);
	if(k%2==0)return t*t;
	else return t*t*x;
}

int main(){
	cin>>n>>k;
	for(int i=1;i<=n;i++){
		for(int j=1;j<=n;j++){
			cin>>a.num[i][j];
			//cout<<a.num[i][j];
			dw.num[i][j]=1;
		}
	}
	ans=ksm(a,k);
	for(int i=1;i<=n;i++){
		for(int j=1;j<=n;j++){
			cout<<ans.num[i][j]<<" ";
		}
		cout<<"\n";
	}
	return 0;
}