diff --git a/2020/GRAKNLABS/a.cpp b/2020/GRAKNLABS/a.cpp
new file mode 100644
index 00000000..9cd9378e
--- /dev/null
+++ b/2020/GRAKNLABS/a.cpp
@@ -0,0 +1,171 @@
+#include<bits/stdc++.h>
+#include<ext/pb_ds/assoc_container.hpp>
+#include<ext/pb_ds/tree_policy.hpp>
+#define     ll          long long int
+#define     ld          double
+#define     REP(i,x,n)    for(ll i=x;i<n;i++)
+#define     SZ(v)       (ll)v.size()
+#define     endl        "\n"
+#define     ff          first
+#define     ss          second
+#define     PQ_MIN      priority_queue <ll, vector<ll>, greater<ll> >
+#define     PQ          priority_queue <int>
+#define     pbds        tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
+#define     setbit(x)   __builtin_popcount(x)
+#define     prec(n)     fixed<<setprecision(n)
+#define     pb(n)       push_back(n)
+#define     mp(a,b)     make_pair(a,b)
+#define     clr(n)      memset(n,0,sizeof(n))
+#define     reset(n)    memset(n,-1,sizeof(n))
+#define     ii          pair<ll,ll>
+#define     vll         vector<ll>
+#define     PI          3.1415926535897932384626433832795028841971693993751
+
+using namespace std;
+using namespace __gnu_pbds;
+bool comp(pair<ll,ll> a,pair<ll,ll> b) {       }
+const ll MOD=1e9+7;
+void print(vector<vector<ll> >&v)
+{
+    ll n=v.size();
+    ll m=v[0].size();
+    cout<<"\n";
+    for(ll i=0;i<n;i++)
+    {
+        for(ll j=0;j<m;j++)
+            cout<<v[i][j]<<" ";
+        cout<<"\n";
+    }
+}
+void print(vector<ll>&v)
+{
+    ll n=v.size();
+    cout<<"\n";
+    for(ll i=0;i<n;i++)
+    {
+            cout<<v[i]<<" ";
+    }
+        cout<<"\n";
+
+}
+void print(set<ll>&s)
+{
+
+cout<<endl;
+
+set<ll>::iterator it;
+for(it=s.begin();it!=s.end();it++)
+    cout<<*it<<" ";
+cout<<endl;
+}
+ll __lcm(ll a,ll b)
+{
+    return ((a*b)/__gcd(a,b));
+}
+ll power(ll a,ll p)
+{
+    ll res=1;
+    while(p>0)
+    {
+        if(p&1){
+            res=(res*a)%MOD;
+            p--;
+        }
+            a=(a*a)%MOD;
+            p/=2;
+    }
+
+    return res%MOD;
+}
+const ll INF=1e9+2;
+const ll nxm=2e5+5;
+
+ll spf[nxm];
+void sieve()
+{
+    memset(spf,-1,sizeof(spf));
+
+    spf[0]=spf[1]=1;
+
+    for(ll i=2;i<nxm;i++)
+    {
+        if(spf[i]==-1)
+            spf[i]=i;
+        for(ll j=i*i;j<nxm;j+=i)
+        {
+            if(spf[j]==-1)
+                spf[j]=i;
+
+        }
+
+    }
+//    while(x>1)
+//    {
+//        ll s=spf[x];
+//        temp[s]++;
+//        x/=s;
+//    }
+
+
+// log n prime factor
+}
+void solve(){
+ll n;
+cin>>n;
+ll a[n],b[n],c[n];
+REP(i,0,n) cin>>a[i];
+REP(i,0,n) cin>>b[i];
+REP(i,0,n) cin>>c[i];
+ll prev=-1;
+ll ans[n];
+REP(i,0,n-1)
+{
+    if(a[i]!=prev)
+    {
+        ans[i]=a[i];
+    }
+    else if(b[i]!=prev)
+    {
+        ans[i]=b[i];
+
+    }
+    else
+    {
+        ans[i]=c[i];
+    }
+    prev=ans[i];
+}
+if(a[n-1]!=prev && a[n-1]!=ans[0])
+{
+    ans[n-1]=a[n-1];
+}
+else if(b[n-1]!=prev && b[n-1]!=ans[0])
+{
+    ans[n-1]=b[n-1];
+}
+else
+{
+    ans[n-1]=c[n-1];
+}
+
+REP(i,0,n)
+cout<<ans[i]<<" ";
+cout<<endl;
+}
+
+
+int main(){
+//    freopen("timber_input", "r", stdin);
+//    freopen("output.txt", "w", stdout);
+	ios_base::sync_with_stdio(false);
+	cin.tie(0);
+	cout.tie(0);
+	ll t=1;
+	cin>>t;
+    REP(i,1,t+1)
+    {
+//    cout<<"Case #"<<i<<": ";
+		solve();
+    }
+	return 0;
+}
diff --git a/2020/GRAKNLABS/b.cpp b/2020/GRAKNLABS/b.cpp
new file mode 100644
index 00000000..55a32a3a
--- /dev/null
+++ b/2020/GRAKNLABS/b.cpp
@@ -0,0 +1,162 @@
+#include<bits/stdc++.h>
+#include<ext/pb_ds/assoc_container.hpp>
+#include<ext/pb_ds/tree_policy.hpp>
+#define     ll          long long int
+#define     ld          double
+#define     REP(i,x,n)    for(ll i=x;i<n;i++)
+#define     SZ(v)       (ll)v.size()
+#define     endl        "\n"
+#define     ff          first
+#define     ss          second
+#define     PQ_MIN      priority_queue <ll, vector<ll>, greater<ll> >
+#define     PQ          priority_queue <int>
+#define     pbds        tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
+#define     setbit(x)   __builtin_popcount(x)
+#define     prec(n)     fixed<<setprecision(n)
+#define     pb(n)       push_back(n)
+#define     mp(a,b)     make_pair(a,b)
+#define     clr(n)      memset(n,0,sizeof(n))
+#define     reset(n)    memset(n,-1,sizeof(n))
+#define     ii          pair<ll,ll>
+#define     vll         vector<ll>
+#define     PI          3.1415926535897932384626433832795028841971693993751
+
+using namespace std;
+using namespace __gnu_pbds;
+bool comp(pair<ll,ll> a,pair<ll,ll> b) {       }
+const ll MOD=1e9+7;
+void print(vector<vector<ll> >&v)
+{
+    ll n=v.size();
+    ll m=v[0].size();
+    cout<<"\n";
+    for(ll i=0;i<n;i++)
+    {
+        for(ll j=0;j<m;j++)
+            cout<<v[i][j]<<" ";
+        cout<<"\n";
+    }
+}
+void print(vector<ll>&v)
+{
+    ll n=v.size();
+    cout<<"\n";
+    for(ll i=0;i<n;i++)
+    {
+            cout<<v[i]<<" ";
+    }
+        cout<<"\n";
+
+}
+void print(set<ll>&s)
+{
+
+cout<<endl;
+
+set<ll>::iterator it;
+for(it=s.begin();it!=s.end();it++)
+    cout<<*it<<" ";
+cout<<endl;
+}
+ll __lcm(ll a,ll b)
+{
+    return ((a*b)/__gcd(a,b));
+}
+ll power(ll a,ll p)
+{
+    ll res=1;
+    while(p>0)
+    {
+        if(p&1){
+            res=(res*a)%MOD;
+            p--;
+        }
+            a=(a*a)%MOD;
+            p/=2;
+    }
+
+    return res%MOD;
+}
+const ll INF=1e9+2;
+const ll nxm=2e5+5;
+
+ll spf[nxm];
+void sieve()
+{
+    memset(spf,-1,sizeof(spf));
+
+    spf[0]=spf[1]=1;
+
+    for(ll i=2;i<nxm;i++)
+    {
+        if(spf[i]==-1)
+            spf[i]=i;
+        for(ll j=i*i;j<nxm;j+=i)
+        {
+            if(spf[j]==-1)
+                spf[j]=i;
+
+        }
+
+    }
+//    while(x>1)
+//    {
+//        ll s=spf[x];
+//        temp[s]++;
+//        x/=s;
+//    }
+
+
+// log n prime factor
+}
+void solve(){
+ll n,k;
+cin>>n>>k;
+ll a[n];
+ll ans=0;
+REP(i,0,n) cin>>a[i];
+while(ans<=n)
+{
+    ll cnt=1,ind=-1;
+    for(ll i=1;i<n;i++)
+    {
+            if(a[i]!=a[i-1])
+            {
+                cnt++;
+
+            }
+            if(cnt>k)
+            {
+                ind=i;break;
+            }
+    }
+    ans++;
+    if(ind==-1)
+    {
+        cout<<ans<<endl;return;
+    }
+    for(ll j=0;j<ind;j++)
+    {
+        a[j]=0;
+    }
+}
+cout<<-1<<endl;
+
+}
+
+
+int main(){
+//    freopen("timber_input", "r", stdin);
+//    freopen("output.txt", "w", stdout);
+	ios_base::sync_with_stdio(false);
+	cin.tie(0);
+	cout.tie(0);
+	ll t=1;
+	cin>>t;
+    REP(i,1,t+1)
+    {
+//    cout<<"Case #"<<i<<": ";
+		solve();
+    }
+	return 0;
+}