#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000001
#define Inf64 1000000000000000001



int main(){
	
	int N;
	cin>>N;
	
	vector<long long> x(N);
	rep(i,N)cin>>x[i];
	fenwick_tree<long long> F(N-1);
	rep(i,N-1){
		if(x[i]==x[i+1])F.add(i,1);
	}
	vector<int> cnt(N+5,0);
	int Q;
	cin>>Q;
	rep(_,Q){
		long long l,r,S;
		cin>>l>>r>>S;
		l--;
		if(r-l>=100){
			assert(false);
			long long t = F.sum(l,r-1);
			if(t<=60 && (1LL<<t)<=S){
				cout<<1<<endl;
				continue;
			}
			else{
				cout<<0<<endl;
				continue;
			}
		}
		else{
			
			int n = r-l;
			int ok = 0,ng = n+2;
			while(ng-ok>1){
				int mid = (ok+ng)/2;
				vector<long long> dp(n+1,0);
				dp[0] = 1;
				rep(j,n){
					int C = 0;
					for(int k=0;k<n;k++){
						if(j+k>=n)break;
						if(cnt[x[l+j+k]]==0){
							C++;
							if(C>mid)break;
							cnt[x[l+j+k]] = 1;
						}
						
						dp[j+k+1] = min(S+1,dp[j+k+1]+dp[j]);
					}
					for(int k=0;k<n;k++){
						if(j+k>=n)break;
						cnt[x[l+j+k]] = 0;
						
					}
				}
				L:;
				if(dp.back()>S)ng = mid;
				else ok = mid;
			}
			if(ok>=n)cout<<-1<<endl;
			else cout<<ok<<endl;
			
		}
		
		
	}
	
	
	return 0;
}