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<cstdio>

int main() {
	int m, nmin, nmax, p[201], maxg = 0 , n;
	while (1) {
		scanf("%d %d %d", &m, &nmin, &nmax);
		for (int i = 1; i <= m; i++) {
			scanf("%d", &p[i]);
		}
		for (int j = nmin; j <= nmax; j++) {
			if (p[j] - p[j+1] >= maxg) {
				maxg = p[j] - p[j+1];
				n = j;
			}
		}
		if (m == 0 && nmin == 0 && nmax == 0) {
			return 0;
		}
		else {
			printf("%d\n", n);
		}
	}
}

C++: #include <bits/stdc++.h>

#define rep(i, n) for (int i = 0; i < int(n); i++)
#define rrep(i, n) for (int i = int(n) - 1; i >= 0; i--)
#define reps(i, n) for (int i = 1; i <= int(n); i++)
#define rreps(i, n) for (int i = int(n); i >= 1; i--)
#define repc(i, n) for (int i = 0; i <= int(n); i++)
#define rrepc(i, n) for (int i = int(n); i >= 0; i--)
#define repi(i, a, b) for (int i = int(a); i < int(b); i++)
#define repic(i, a, b) for (int i = int(a); i <= int(b); i++)
#define each(x, y) for (auto &x : y)
#define all(a) (a).begin(), (a).end()
#define bit(b) (1ll << (b))

using namespace std;

using i32 = int;
using i64 = long long;
using u64 = unsigned long long;
using f80 = long double;
using vi32 = vector<i32>;
using vi64 = vector<i64>;
using vu64 = vector<u64>;
using vf80 = vector<f80>;
using vstr = vector<string>;

inline void yes() { cout << "Yes" << '\n'; exit(0); }
inline void no() { cout << "No" << '\n'; exit(0); }
inline i64 gcd(i64 a, i64 b) { if (min(a, b) == 0) return max(a, b); if (a % b == 0) return b; return gcd(b, a % b); }
inline i64 lcm(i64 a, i64 b) { return a / gcd(a, b) * b; }
inline u64 xorshift() { static u64 x = 88172645463325252ull; x = x ^ (x << 7); return x = x ^ (x >> 9); }
void solve(); int main() { ios::sync_with_stdio(0); cin.tie(0); cout << fixed << setprecision(16); solve(); return 0; }
template <typename T> class pqasc : public priority_queue<T, vector<T>, greater<T>> {};
template <typename T> class pqdesc : public priority_queue<T, vector<T>, less<T>> {};
template <typename T> inline void amax(T &x, T y) { if (x < y) x = y; }
template <typename T> inline void amin(T &x, T y) { if (x > y) x = y; }
template <typename T> inline T power(T x, i64 n, T e = 1) { T r = e; while (n > 0) { if (n & 1) r *= x; x *= x; n >>= 1; } return r; }
template <typename T> istream& operator>>(istream &is, vector<T> &v) { each(x, v) is >> x; return is; }
template <typename T> ostream& operator<<(ostream &os, vector<T> &v) { rep(i, v.size()) { if (i) os << ' '; os << v[i]; } return os; }
template <typename T, typename S> istream& operator>>(istream &is, pair<T, S> &p) { is >> p.first >> p.second; return is; }
template <typename T, typename S> ostream& operator<<(ostream &os, pair<T, S> &p) { os << p.first << ' ' << p.second; return os; }

void solve() {
  while (true) {
    int m, nmin, nmax;
    cin >> m >> nmin >> nmax;
    if (m == 0) return;
    vi32 p(m); cin >> p;

    int ma = 0, ans = -1;
    repi(i, nmin - 1, nmax) {
      if (ma <= p[i] - p[i + 1]) {
        ma = p[i] - p[i + 1];
        ans = i + 1;
      }
    }
    cout << ans << '\n';
  }
}

C++: // #define _GLIBCXX_DEBUG // for STL debug (optional)
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <string>
#include <cstring>
#include <deque>
#include <list>
#include <queue>
#include <stack>
#include <vector>
#include <utility>
#include <algorithm>
#include <map>
#include <set>
#include <complex>
#include <cmath>
#include <limits>
#include <cfloat>
#include <climits>
#include <ctime>
#include <cassert>
#include <numeric>
#include <fstream>
#include <functional>
#include <bitset>
using namespace std;

#define debug(...) fprintf(stderr, __VA_ARGS__)
#define int long long int
 
template<typename T> void chmax(T &a, T b) {a = max(a, b);}
template<typename T> void chmin(T &a, T b) {a = min(a, b);}
template<typename T> void chadd(T &a, T b) {a = a + b;}
 
typedef pair<int, int> pii;
typedef long long ll;
 
int dx[] = {0, 0, 1, -1};
int dy[] = {1, -1, 0, 0};
const ll INF = 1001001001001001LL;
const ll MOD = 1000000007LL;
 
signed main() {
    while(1) {
        int M, Nmin, Nmax;
        cin >> M >> Nmin >> Nmax;
        if(!(M || Nmin || Nmax)) break;

        vector<int> P(M);
        for(int i=0; i<M; i++) {
            cin >> P[i];
        }
        sort(P.rbegin(), P.rend());

        int max_gap = -INF, ans = 0;
        for(int i=Nmax; i>=Nmin; i--) {
            // さかいめ
            if(i < 1 or i >= M) continue;
            int mi = P[i];
            int ma = P[i-1];
            int gap = ma - mi;
            if(max_gap < gap) {
                max_gap = gap;
                ans = i;
            }
        }
        cout << ans << endl;
    }
    return 0;
}

C++: #include <iostream>
#include <stdio.h>
#include <string.h>
#include <string>
#include <functional>
#include <algorithm>
#include <string>
#include <vector>
#include <algorithm>
#include <time.h>
#include <stdlib.h>
#include <math.h>

using namespace std;

int main (void)
{
	long m,min,max,p[10000],g[10000],kkk,rrr;

	for (long o = 0; o < 10000; o++)
	{
	cin >> m >> min >> max;

	if (m == 0 && min == 0)
	{
		if (max == 0)
		{
			break;
		}
	}

	kkk = 0;

	for (long i = 1; i < m + 1; i++)
	{
		cin >> p[i];
	}

	for (long j = min; j < max + 1; j++)
	{
		g[j] = p[j] - p[j + 1];

		if (kkk <= g[j])
		{
			kkk = 0;
			kkk = g[j];
			rrr = 0;
			rrr = j;
		}
	}

		cout << rrr << endl;
	}
}

C++: #include<bits/stdc++.h>

#define REP(i,s,n) for(int i=s;i<n;++i)
#define rep(i,n) REP(i,0,n)

using namespace std;

int m,n_min,n_max, P[210];

int main() {
  while( cin >> m >> n_min >> n_max, m | n_min | n_max ) {
    rep(i,m) cin >> P[i];
    sort(P,P+m,greater<int>());
    int max_diff = -1;
    int n=1;
    --n_min, --n_max;
    REP(i,n_min,n_max+1) {
      int diff = P[i] - P[i+1];
      if( diff >= max_diff ) {
	max_diff = diff;
	n = i+1;
      }
    }
    cout << n << endl;
  }
  return 0;
}

C++: #include<iostream>
#include<cstdio>
using namespace std;
int main(){
  while(1){
    int a,b,c,n[300],max,sa,ans;
    cin>>a>>b>>c;
    if(a==0&&b==0&&c==0)break;
    for(int i=0;i<a;i++){
      cin>>n[i];
    }
    for(int i=b-1;i<=c-1;i++){
      sa=n[i]-n[i+1];
      if(i==b-1)max=sa;
      if(max<=sa){
        max=sa;
        ans=i+1;
      }
    }
    printf("%d\n",ans);
  }
  return 0;
}

C++: #include<bits/stdc++.h>
using namespace std;
int main(){
  int m,s,g,p[200];
  while(cin>>m>>s>>g,m){
    int ans=-1,an;
    for(int i=0;i<m;i++)cin>>p[i];
    sort(p,p+m,greater<int>());
    for(int i=g;i>=s;i--)if(ans<p[i-1]-p[i])ans=p[i-1]-p[i],an=i;
    cout<<an<<endl;
  }
  return 0;
}

C++: #include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<int,int> p;


int main()
{
  while(true) {
    ll m, nmin, nmax;
    cin >> m >> nmin >> nmax;
    if (m == 0 && nmin == 0 && nmax == 0) {
      break;
    }
    vector<ll> v(m, 0);
    for (int i = 0; i < m; i++){
      cin >> v[i];
    }
    ll tmp = 0;
    ll res = -1;
    for (int i = nmin-1; i < nmax; i++){
      if (v[i] - v[i+1] >= tmp) {
        tmp = v[i] - v[i+1];
        res = i+1;
      }
    }
    cout << res << endl;
  }
}