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 <vector>
#include <cassert>
#include <iostream>
#include <algorithm>
using namespace std;
int main() {
int N, A, B;
cin >> N >> A >> B;
assert(A == 1);
vector<int> v(N);
for (int i = 0; i < N; i++) cin >> v[i];
long long ret = 0;
for (int i = 40; i >= 0; i--) {
vector<int> dp(N + 1, 1 << 30);
dp[0] = 0;
for (int j = 1; j <= N; j++) {
long long cur = 0;
for (int k = j - 1; k >= 0; k--) {
cur += v[k];
if (((cur >> (i + 1)) | ret) == ret && !((cur >> i) & 1)) {
dp[j] = min(dp[j], dp[k] + 1);
}
}
}
ret <<= 1;
if (dp[N] > B) ret++;
}
cout << ret << '\n';
return 0;
}
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