112 lines
2.1 KiB
C++
112 lines
2.1 KiB
C++
#include <bits/stdc++.h> // {{{
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// https://codeforces.com/blog/entry/96344
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#pragma GCC optimize("O2,unroll-loops")
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#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
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using namespace std;
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using i32 = int32_t;
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using u32 = uint32_t;
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using i64 = int64_t;
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using u64 = uint64_t;
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using f64 = double;
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using f128 = long double;
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#if __cplusplus >= 202002L
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template <typename T>
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constexpr T MIN = std::numeric_limits<T>::min();
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template <typename T>
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constexpr T MAX = std::numeric_limits<T>::max();
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template <typename T>
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[[nodiscard]] static T sc(auto&& x) {
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return static_cast<T>(x);
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}
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template <typename T>
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[[nodiscard]] static T sz(auto&& x) {
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return static_cast<T>(x.size());
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}
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#endif
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static void NO() {
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std::cout << "NO\n";
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}
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static void YES() {
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std::cout << "YES\n";
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}
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template <typename T>
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using vec = std::vector<T>;
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#define all(x) (x).begin(), (x).end()
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#define rall(x) (x).rbegin(), (x).rend()
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#define ff first
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#define ss second
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#ifdef LOCAL
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#define db(...) std::print(__VA_ARGS__)
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#define dbln(...) std::println(__VA_ARGS__)
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#else
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#define db(...)
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#define dbln(...)
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#endif
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// }}}
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void solve() {
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u32 n;
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i64 k;
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cin >> n >> k;
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vec<u64> a(n);
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for (auto& e : a)
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cin >> e;
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const u32 B = 31;
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vec<i64> dp(B + 1, MIN<i64>), ndp(B + 1, MIN<i64>);
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dp[0] = 0;
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for (u32 i = 0; i < n; ++i) {
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fill(all(ndp), MIN<i64>);
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u32 upto = min<u32>(B, i);
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for (u32 b = 0; b <= upto; ++b) {
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if (dp[b] == MIN<i64>)
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continue;
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i64 gain_good = sc<i64>(a[i] >> b) - k;
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ndp[b] = max(ndp[b], dp[b] + gain_good);
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u32 b2 = min<u32>(B, b + 1);
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i64 gain_bad = sc<i64>(a[i] >> b2);
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ndp[b2] = max(ndp[b2], dp[b] + gain_bad);
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}
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dp.swap(ndp);
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}
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println("{}", *max_element(all(dp)));
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}
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int main() { // {{{
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std::cin.exceptions(std::cin.failbit);
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#ifdef LOCAL
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std::cerr.rdbuf(std::cout.rdbuf());
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std::cout.setf(std::ios::unitbuf);
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std::cerr.setf(std::ios::unitbuf);
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#else
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std::cin.tie(nullptr)->sync_with_stdio(false);
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#endif
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u32 tc = 1;
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std::cin >> tc;
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for (u32 t = 0; t < tc; ++t) {
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solve();
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}
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return 0;
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}
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// }}}
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