Go: package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

func nextInt(sc *bufio.Scanner) int {
	sc.Scan()
	i, err := strconv.Atoi(sc.Text())
	if err != nil {
		panic(err)
	}
	return i
}

func main() {
	sc := bufio.NewScanner(os.Stdin)
	sc.Split(bufio.ScanWords)

	for {
		m, nMin, nMax := nextInt(sc), nextInt(sc), nextInt(sc)
		if m == 0 && nMin == 0 && nMax == 0 {
			break
		}

		score_list := []int{}
		for i := 0; i < m; i++ {
			score_list = append(score_list, nextInt(sc))
		}

		// 最低合格者数と最高合格者数の間の各得点間のギャップが最大になる合格者数を取得する
		scoreGap := 0
		scoreGapMax := 0
		qualifiedNum := 0
		for n := nMin; n <= nMax; n++ {
			scoreGap = score_list[n-1] - score_list[n]
			if scoreGap >= scoreGapMax {
				scoreGapMax = scoreGap
				qualifiedNum = n
			}
		}

		fmt.Println(qualifiedNum)
	}
}

C++: 
#include "bits/stdc++.h"

#define sai(j,n) for(sei j=0;j<sei(n);++j)
#define hsai(j,n) for(sei j=sei(n)-1;j>=0;--j)
#define kan(j,m,n) for(sei j=m;j<sei(n);++j)
#define hkan(j,m,n) for(sei j=sei(n)-1;j>=sei(m);--j)
#define zen(v) (v).begin(),(v).end()
#define yu(v) v.erase(unique(zen(v)), v.end());
#define syutu(v) si(a, (v).size()) {cout << v[a];if(a != v.size()-1)cout << " ";else cout << endl;}
#define mug 10000000111;
#define yo 10000000711;
#define kyo 1e-9;

const int dx[8] = {11,0,-1,-1,-1,0,1};
const int dy[8] = {0,1,1,1,0,-1,-1,-1};

using namespace std;
typedef long long sei;
typedef long double syo;
typedef vector<sei> vs;
typedef vector<syo> vy;
typedef vector<vs> vvs;
typedef vector<vy> vvy;
typedef pair<sei, sei> ks;
sei max(sei a, int b) {return max(a, sei(b));}
sei max(int a, sei b) {return max(sei(a), b);}

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    sei m, nmin, nmax;
    sei ninzu=0;
    while(cin >> m >> nmin >> nmax, m || nmin || nmax){
        vs p(m);
        sei gap=0;
        sai(j,m){
            cin >> p[j];
        }
        sort(p.begin(),p.end());
        kan(j,nmin,nmax+1){
            if((p[m-j] - p[m-j-1])>=gap){
                gap = p[m-j]-p[m-j-1];
                ninzu = j;
            }
        }
        cout << ninzu << endl;
    }
    return 0;
}

C++: #include <iostream>

using namespace std;
#define rep(i,n) for(int i = 0;i < (n) ;i++)

int m,nmin,nmax;
int p[1000];
signed main(void) {
    while(true) {
    cin >> m >> nmin >> nmax;
    if (m == 0) break;
    rep (i,m) cin >> p[i];

    int n;
    int mgap = 0;
    int ans = nmin;
    for (n = nmin; n <= nmax;n++) {
        int gap = p[n-1] - p[n];
        if (gap >= mgap) {
            mgap = gap;
            ans = n;
        }
    }
    cout << ans << endl;
    }
    return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;

#define rep(i,n) for(int i=0;i<(n);i++)
#define fi first
#define se second
#define pb push_back
#define mp make_pair

using vi = vector<int>;
using vvi = vector<vi>;
using ll = long long;
using pii = pair<int,int>;

template<typename T> ostream& operator<< (ostream& os,const vector<T>& vec){ os << "{"; for(T v:vec) os << v << ","; os << "}"; }
template<typename T> ostream& operator<< (ostream& os,const set<T>& st){ os << "{"; for(T v:st) os << v << ","; os << "}"; }
template<typename T,typename U> ostream& operator<< (ostream& os,const pair<T,U>& p){ os << "{" << p.first << "," << p.second << "}"; return os; }


int m,nmin,nmax;

void solve(){
    vector<int> P(m);
    rep(i,m) cin>>P[i];

    int ans = -1;
    int diff = 0;

    for(int i=nmin;i<=nmax;i++){
        int idx = i-1;
        if(P[idx]==P[idx+1]) continue;

        int d = P[idx]-P[idx+1];
        //cout << i <<  " " << d << endl;
        if(diff <= d){
            diff = d;
            ans = i;
        }
    }
    cout << ans << endl;
}

int main(){
    while(1){
        cin >> m >> nmin >> nmax;
        if(m==0 and nmin==0 and nmax==0) break;
        solve();
    }
}

C++: // warm heart, wagging tail,and a smile just for you!
//                                                                     ███████████
//                                                                   ███╬╬╬╬╬╬╬╬╬╬███
//                                                                ███╬╬╬╬╬████╬╬╬╬╬╬███
//                                            ███████████       ██╬╬╬╬╬████╬╬████╬╬╬╬╬██
//                                      █████████╬╬╬╬╬████████████╬╬╬╬╬██╬╬╬╬╬╬███╬╬╬╬╬██
//                               ████████╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬█████████╬╬╬╬╬╬██╬╬╬╬╬╬╬██
//                             ████╬██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬█████████╬╬╬╬╬╬╬╬╬╬╬██
//                           ███╬╬╬█╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██╬╬███╬╬╬╬╬╬╬█████
//                         ███╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██╬╬╬████████╬╬╬╬╬██
//                       ███╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬███╬╬╬╬╬╬╬╬╬███
//                     ███╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬█████╬╬╬╬╬╬╬██
//                 ████╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬████╬╬╬╬╬████
//     █████████████╬╬╬╬╬╬╬╬██╬╬╬╬╬████╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬█████╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬███╬╬╬╬██████
//   ████╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██╬╬██████╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██████╬╬╬╬╬╬╬███████████╬╬╬╬╬╬╬╬██╬╬╬██╬╬╬██
// ███╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬████╬╬╬╬╬╬╬╬╬╬╬█╬╬╬╬╬╬╬██╬╬╬╬╬╬╬╬██
// ██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██╬╬╬╬▓▓▓▓▓▓╬╬╬████╬╬████╬╬╬╬╬╬╬▓▓▓▓▓▓▓▓██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██╬╬╬╬╬╬╬███
// ██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██████▓▓▓▓▓▓▓╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬▓▓▓▓▓▓▓██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██╬╬╬╬█████
// ███╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬███╬╬╬╬╬██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬█████╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬████████
//   ███╬╬╬╬╬╬╬╬╬╬╬╬╬█████╬╬╬╬╬╬╬╬██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬███╬╬██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██
//       ██████████████  ████╬╬╬╬╬╬███████████████████████████╬╬╬╬╬██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬████
//                         ███████                           █████  ███████████████████
#include "bits/stdc++.h"
using namespace std;
#define MOD 1000000007
//#define MOD 998244353
const double EPS = 1e-9;
#define INF (1LL<<60)
#define D double
#define fs first
#define sc second
#define int long long
#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define RFOR(i,a,b) for(int i = (b-1);i>=(a);i--)
#define REP(i,n)  FOR(i,0,(n))
#define RREP(i,n) RFOR(i,0,(n))
#define ITR(itr,mp) for(auto itr = (mp).begin(); itr != (mp).end(); ++itr)
#define RITR(itr,mp) for(auto itr = (mp).rbegin(); itr != (mp).rend(); ++itr)
#define range(i,a,b) ((a)<=(i) && (i)<(b))
#define debug(x)  cout << #x << " = " << (x) << endl;
#define SP << " " << 
typedef pair<int,int> P;
typedef vector<vector<P> > Graph;
typedef vector<int> vec;
typedef vector<vector<int>> mat;

int n,s,t;
void solve(){
  
  vector<int> p(n);
  REP(i,n) cin >> p[i];
  
  sort(p.begin(),p.end());
  reverse(p.begin(),p.end());

  int ans = 0, mx = 0;
  FOR(i,s,t+1){
    if(mx <= p[i-1]-p[i]){
      ans = i; mx = p[i-1]-p[i];
    }
  }

  cout << ans << endl;

}

signed main(){
  ios::sync_with_stdio(false);
  cin.tie(0);

  //int q; cin >> q;
  //while(q--) solve();
  while(cin >> n >> s >> t, n) solve();

  return 0;
}

C++: #include <bits/stdc++.h>
 
using namespace std;
 
int main()
{
    int m, n1, n2;
    while(cin >> m >> n1 >> n2, m || n1 || n2){
    int P[201];
    for(int i = 0; i < m; i++) cin >> P[i];
    int ans = n1;
    for(int i = n1; i <= n2; i++){
        if(P[ans-1]-P[ans] <= P[i-1]-P[i]) ans = i;
    }
    cout << ans << endl;
    }
     
    return 0;
}