#include "paint.h"
#include<bits/stdc++.h>
using namespace std;
#define pb push_back
#define fi first
#define se second
#define sz(a) (int)(a.size())
#define all(a) a.begin(),a.end()
#define lb lower_bound
#define ub upper_bound
#define owo ios_base::sync_with_stdio(0);cin.tie(0);
#define MOD (ll)(1e9+7)
#define INF (ll)(1e18)
#define debug(...) fprintf(stderr, __VA_ARGS__),fflush(stderr)
#define time__(d) for(long blockTime = 0; (blockTime == 0 ? (blockTime=clock()) != 0 : false);\
debug("%s time : %.4fs\n", d, (double)(clock() - blockTime) / CLOCKS_PER_SEC))
typedef long long int ll;
typedef long double ld;
typedef pair<ll,ll> PII;
typedef pair<int,int> pii;
typedef vector<vector<int>> vii;
typedef vector<vector<ll>> VII;
ll gcd(ll a,ll b){if(!b)return a;else return gcd(b,a%b);}
int minimumInstructions(int n, int m, int k, vector<int>c,vector<int> a, vii b)
{
vii co(k);
for(int i=0;i<m;i++){
for(int x:b[i])co[x].pb(i);
}
vector<bool>p(n);
vector<int>rg(n,-1);
deque<int>q1;
for(int x:co[c[n-1]]){rg[x] = n-1;q1.pb(x);}
if(!q1.empty())p[n-1] = 1;
for(int i=n-2;i>=0;i--){
//cout<<"queue"<<'\n';
//for(int x:q1)cout<<x<<" ";
//cout<<'\n';
vector<pii>change;
for(int x:co[c[i]]){
if(rg[(x+1)%m] != -1){
change.pb({x,rg[(x+1)%m]});
if(rg[(x+1)%m] == n-1 || rg[(x+1)%m] >= i+m-1)p[i] = 1;
}else change.pb({x,i});
}
for(int x:q1)rg[x] = -1;
q1.clear();
for(pii x:change){
rg[x.fi] = x.se;
q1.pb(x.fi);
}
}
//for(int i=0;i<n;i++)cout<<p[i]<<" ";
//cout<<'\n';
vector<int>lf(n,-1);
for(int i=0;i<n;i++){
if(p[i])lf[i] = i;
else if(i)lf[i] = lf[i-1];
}
int ans = 0;
int i = 0;
while(i <= n-1){
//cout<<i<<'\n';
if(lf[i] == -1 || lf[i] < i-m)return -1;
ans++;
i = lf[i]+m;
}
return ans;
}
