I=lambda:list(map(int,input().split()))
n,k=I()
a=I()
s=list(range(1,n*k+1))
for i in a:s.remove(i)
for i in range(k):print(' '.join(map(str,[a[i]]+s[i::k])))
#include <bits/stdc++.h>
using namespace std;
long long n,m,a[1069][1069];
bitset<1000069> vtd;
int main()
{
long long i,j,k,p;
scanf("%lld%lld",&n,&m);
for(i=1;i<=m;i++)
{
scanf("%lld",&k);
a[i][1]=k;
vtd[k]=1;
}
p=1;
for(i=1;i<=m;i++)
{
for(j=2;j<=n;j++)
{
for(;vtd[p];p++);
a[i][j]=p;
vtd[p]=1;
}
for(j=1;j<=n;j++)
{
printf("%lld%c",a[i][j]," \n"[j==n]);
}
}
}
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1291A - Even But Not Even | 1269A - Equation |