結果
| 問題 |
No.1609 String Division Machine
|
| コンテスト | |
| ユーザー |
KoD
|
| 提出日時 | 2021-07-17 15:41:48 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 20 ms / 2,000 ms |
| コード長 | 3,392 bytes |
| コンパイル時間 | 1,951 ms |
| コンパイル使用メモリ | 199,068 KB |
| 最終ジャッジ日時 | 2025-01-23 02:59:13 |
|
ジャッジサーバーID (参考情報) |
judge4 / judge3 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 5 |
| other | AC * 37 |
ソースコード
#include <bits/stdc++.h>
using i32 = std::int32_t;
using u32 = std::uint32_t;
using i64 = std::int64_t;
using u64 = std::uint64_t;
using i128 = __int128_t;
using u128 = __uint128_t;
using isize = std::ptrdiff_t;
using usize = std::size_t;
class rep {
struct Iter {
usize itr;
constexpr Iter(const usize pos) noexcept : itr(pos) {}
constexpr void operator++() noexcept { ++itr; }
constexpr bool operator!=(const Iter& other) const noexcept { return itr != other.itr; }
constexpr usize operator*() const noexcept { return itr; }
};
const Iter first, last;
public:
explicit constexpr rep(const usize first, const usize last) noexcept : first(first), last(std::max(first, last)) {}
constexpr Iter begin() const noexcept { return first; }
constexpr Iter end() const noexcept { return last; }
};
class revrep {
struct Iter {
usize itr;
constexpr Iter(const usize pos) noexcept : itr(pos) {}
constexpr void operator++() noexcept { --itr; }
constexpr bool operator!=(const Iter& other) const noexcept { return itr != other.itr; }
constexpr usize operator*() const noexcept { return itr; }
};
const Iter first, last;
public:
explicit constexpr revrep(const usize first, const usize last) noexcept
: first(last - 1), last(std::min(first, last) - 1) {}
constexpr Iter begin() const noexcept { return first; }
constexpr Iter end() const noexcept { return last; }
};
template <class T> bool setmax(T& lhs, const T& rhs) {
if (lhs < rhs) {
lhs = rhs;
return true;
}
return false;
}
template <class T> using Vec = std::vector<T>;
void main_() {
std::string S;
std::cin >> S;
const auto N = S.size();
if (S == std::string(N, '?')) {
std::cout << std::string(N, 'a') << '\n';
return;
}
Vec<int> A(N);
for (const auto i : rep(0, N)) {
A[i] = (S[i] == '?' ? -1 : S[i] - 'a');
}
Vec<std::array<int, 27>> dp(N + 1);
for (auto& arr : dp) {
arr.fill(-1);
}
dp[N][0] = 26;
for (const auto i : revrep(0, N)) {
dp[i] = dp[i + 1];
if (A[i] != -1) {
for (const auto j : rep(0, 26)) {
if (A[i] < dp[i + 1][j]) {
setmax(dp[i][j + 1], A[i]);
}
}
}
}
usize lis = 0;
while (lis < 26 and dp[0][lis + 1] != -1) {
lis += 1;
}
std::array<int, 27> left;
left.fill(26);
left[0] = -1;
for (const auto i : rep(0, N)) {
if (A[i] == -1) {
usize l = 0, r = 26;
for (const auto j : rep(0, 26)) {
while (l < 26 and left[l + 1] < (int)j) {
l += 1;
}
while ((int)j >= dp[i + 1][r]) {
r -= 1;
}
if (l + 1 + r <= lis) {
*std::lower_bound(left.begin(), left.end(), A[i]) = j;
std::cout << (char)(j + 'a');
break;
}
}
} else {
*std::lower_bound(left.begin(), left.end(), A[i]) = A[i];
std::cout << (char)(A[i] + 'a');
}
}
std::cout << '\n';
}
int main() {
std::ios_base::sync_with_stdio(false);
std::cin.tie(nullptr);
main_();
return 0;
}
KoD