This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include "bits/stdc++.h"
using namespace std;
#define ln "\n"
#define dbg(x) cout << #x << " = " << x << ln
#define mp make_pair
#define pb push_back
#define fi first
#define se second
#define inf 2e18
#define fast_cin() \
ios_base::sync_with_stdio(false); \
cin.tie(NULL)
#define out(file) freopen(file, "w", stdout)
#define in(file) freopen(file, "r", stdin)
#define all(x) (x).begin(), (x).end()
#define sz(x) ((int)(x).size())
#define ll long long
int MOD = 1e9 + 7;
const int N = 2001;
int y[N], a, b, n;
ll ps[N], dp[N][N];
void sub1() {
ll ans = inf;
for(int mask = 0; mask < (1 << n); mask++) {
if(((mask >> (n-1)) & 1) == 0) continue;
int cnt = __builtin_popcount(mask);
if(cnt < a or cnt > b) continue;
ll s = 0;
ll cur = 0;
// cerr << "CNT " << cnt << ln;
for(int i = 0; i < n; i++) {
s += y[i+1];
if((mask >> i) & 1) {
cur |= s;
// cerr << s << ' ';
s = 0;
}
}
// cerr << ln;
ans = min(ans, cur);
}
cout << ans;
}
bool f[51][21][501];
void sub2() {
f[0][0][0] = 1;
for(int i = 1; i <= n; i++) {
f[i][1][ps[i]] = 1;
}
int mx = ps[n];
for(int i = 1; i <= n; i++) {
for(int j = 1; j <= b; j++) {
for(int k = 0; k <= mx; k++) {
for(int t = i + 1; t <= n; t++) {
f[t][j+1][k | (ps[t]-ps[i])] = f[i][j][k];
}
}
}
}
for(int k = 0; k <= mx; k++) {
for(int i = a; i <= b; i++) {
if(f[n][i][k]) {
cout << k;
return;
}
}
}
}
signed main() {
fast_cin();
cin >> n >> a >> b;
for(int i = 1; i <= n; i++) cin >> y[i], ps[i] = ps[i-1] + y[i];
// if(n <= 20) sub1();
if(ps[n] <= 500) sub2();
else if(n <= 20) sub1();
// cout << ln;
// sub2();
cerr << "\nTime: " << clock() * 1000 / CLOCKS_PER_SEC;
}
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