結果
| 問題 |
No.2488 Mod Sum Maximization
|
| コンテスト | |
| ユーザー |
emthrm
|
| 提出日時 | 2023-09-30 00:15:31 |
| 言語 | C++23 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 263 ms / 2,000 ms |
| コード長 | 4,820 bytes |
| コンパイル時間 | 3,062 ms |
| コンパイル使用メモリ | 251,604 KB |
| 実行使用メモリ | 28,544 KB |
| 最終ジャッジ日時 | 2024-07-22 18:13:13 |
| 合計ジャッジ時間 | 9,153 ms |
|
ジャッジサーバーID (参考情報) |
judge2 / judge3 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 38 |
ソースコード
#include <bits/stdc++.h>
using namespace std;
#define FOR(i,m,n) for(int i=(m);i<(n);++i)
#define REP(i,n) FOR(i,0,n)
using ll = long long;
constexpr int INF = 0x3f3f3f3f;
constexpr long long LINF = 0x3f3f3f3f3f3f3f3fLL;
constexpr double EPS = 1e-8;
constexpr int MOD = 998244353;
// constexpr int MOD = 1000000007;
constexpr int DY4[]{1, 0, -1, 0}, DX4[]{0, -1, 0, 1};
constexpr int DY8[]{1, 1, 0, -1, -1, -1, 0, 1};
constexpr int DX8[]{0, -1, -1, -1, 0, 1, 1, 1};
template <typename T, typename U>
inline bool chmax(T& a, U b) { return a < b ? (a = b, true) : false; }
template <typename T, typename U>
inline bool chmin(T& a, U b) { return a > b ? (a = b, true) : false; }
struct IOSetup {
IOSetup() {
std::cin.tie(nullptr);
std::ios_base::sync_with_stdio(false);
std::cout << fixed << setprecision(20);
}
} iosetup;
template <typename T>
requires requires {
typename T::Monoid;
{T::id()} -> std::same_as<typename T::Monoid>;
{T::merge(std::declval<typename T::Monoid>(),
std::declval<typename T::Monoid>())}
-> std::same_as<typename T::Monoid>;
}
struct SegmentTree {
using Monoid = typename T::Monoid;
explicit SegmentTree(const int n)
: SegmentTree(std::vector<Monoid>(n, T::id())) {}
explicit SegmentTree(const std::vector<Monoid>& a)
: n(a.size()), p2(std::bit_ceil(a.size())) {
dat.assign(p2 << 1, T::id());
std::copy(a.begin(), a.end(), dat.begin() + p2);
for (int i = p2 - 1; i > 0; --i) {
dat[i] = T::merge(dat[i << 1], dat[(i << 1) + 1]);
}
}
void set(int idx, const Monoid val) {
idx += p2;
dat[idx] = val;
while (idx >>= 1) dat[idx] = T::merge(dat[idx << 1], dat[(idx << 1) + 1]);
}
Monoid get(int left, int right) const {
Monoid res_l = T::id(), res_r = T::id();
for (left += p2, right += p2; left < right; left >>= 1, right >>= 1) {
if (left & 1) res_l = T::merge(res_l, dat[left++]);
if (right & 1) res_r = T::merge(dat[--right], res_r);
}
return T::merge(res_l, res_r);
}
Monoid operator[](const int idx) const { return dat[idx + p2]; }
template <typename G>
int find_right(int left, const G g) const {
if (left >= n) [[unlikely]] return n;
Monoid val = T::id();
left += p2;
do {
while (!(left & 1)) left >>= 1;
Monoid nxt = T::merge(val, dat[left]);
if (!g(nxt)) {
while (left < p2) {
left <<= 1;
nxt = T::merge(val, dat[left]);
if (g(nxt)) {
val = nxt;
++left;
}
}
return left - p2;
}
val = nxt;
++left;
} while (!std::has_single_bit(static_cast<unsigned int>(left)));
return n;
}
template <typename G>
int find_left(int right, const G g) const {
if (right <= 0) [[unlikely]] return -1;
Monoid val = T::id();
right += p2;
do {
--right;
while (right > 1 && (right & 1)) right >>= 1;
Monoid nxt = T::merge(dat[right], val);
if (!g(nxt)) {
while (right < p2) {
right = (right << 1) + 1;
nxt = T::merge(dat[right], val);
if (g(nxt)) {
val = nxt;
--right;
}
}
return right - p2;
}
val = nxt;
} while (!std::has_single_bit(static_cast<unsigned int>(right)));
return -1;
}
private:
const int n, p2;
std::vector<Monoid> dat;
};
namespace monoid {
template <typename T>
struct RangeMinimumQuery {
using Monoid = T;
static constexpr Monoid id() { return std::numeric_limits<Monoid>::max(); }
static Monoid merge(const Monoid& a, const Monoid& b) {
return std::min(a, b);
}
};
template <typename T>
struct RangeMaximumQuery {
using Monoid = T;
static constexpr Monoid id() { return std::numeric_limits<Monoid>::lowest(); }
static Monoid merge(const Monoid& a, const Monoid& b) {
return std::max(a, b);
}
};
template <typename T>
struct RangeSumQuery {
using Monoid = T;
static constexpr Monoid id() { return 0; }
static Monoid merge(const Monoid& a, const Monoid& b) { return a + b; }
};
} // namespace monoid
int main() {
int n; cin >> n;
vector<int> a(n); REP(i, n) cin >> a[i];
SegmentTree<monoid::RangeMinimumQuery<ll>> dp(a.back() + 1);
dp.set(a.back(), 0);
for (int i = n - 2; i >= 0; --i) {
ll dp_ai = LINF;
for (int d = 1; ; ++d) {
const ll tmp = dp.get(a[i] * d, min(a[i] * (d + 1), a.back() + 1));
if (tmp != monoid::RangeMinimumQuery<ll>::id()) {
chmin(dp_ai, tmp + 1LL * d * a[i]);
}
if (a[i] * (d + 1) > a.back()) break;
}
dp.set(a[i], dp_ai);
}
// REP(i, a.back() + 1) cout << (dp[i] == monoid::RangeMinimumQuery<ll>::id() ? -1 : dp[i]) << " \n"[i == a.back()];
cout << reduce(a.begin(), a.end(), 0LL) - dp[a.front()] << '\n';
return 0;
}
emthrm