結果
| 問題 |
No.1270 Range Arrange Query
|
| コンテスト | |
| ユーザー |
 Mister
|
| 提出日時 | 2020-10-23 23:04:09 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 3,986 ms / 7,000 ms |
| コード長 | 5,958 bytes |
| コンパイル時間 | 1,050 ms |
| コンパイル使用メモリ | 82,424 KB |
| 最終ジャッジ日時 | 2025-01-15 13:52:38 |
|
ジャッジサーバーID （参考情報） |
judge5 / judge3 |
（要ログイン）
| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 15 |
ソースコード
#include <iostream>
#include <algorithm>
#include <vector>
#include <cassert>
#include <numeric>
#include <type_traits>
namespace atcoder {
namespace internal {
#ifndef _MSC_VER
template <class T>
using is_signed_int128 =
typename std::conditional<std::is_same<T, __int128_t>::value ||
std::is_same<T, __int128>::value,
std::true_type,
std::false_type>::type;
template <class T>
using is_unsigned_int128 =
typename std::conditional<std::is_same<T, __uint128_t>::value ||
std::is_same<T, unsigned __int128>::value,
std::true_type,
std::false_type>::type;
template <class T>
using make_unsigned_int128 =
typename std::conditional<std::is_same<T, __int128_t>::value,
__uint128_t,
unsigned __int128>;
template <class T>
using is_integral = typename std::conditional<std::is_integral<T>::value ||
is_signed_int128<T>::value ||
is_unsigned_int128<T>::value,
std::true_type,
std::false_type>::type;
template <class T>
using is_signed_int = typename std::conditional<(is_integral<T>::value &&
std::is_signed<T>::value) ||
is_signed_int128<T>::value,
std::true_type,
std::false_type>::type;
template <class T>
using is_unsigned_int =
typename std::conditional<(is_integral<T>::value &&
std::is_unsigned<T>::value) ||
is_unsigned_int128<T>::value,
std::true_type,
std::false_type>::type;
template <class T>
using to_unsigned = typename std::conditional<
is_signed_int128<T>::value,
make_unsigned_int128<T>,
typename std::conditional<std::is_signed<T>::value,
std::make_unsigned<T>,
std::common_type<T>>::type>::type;
#else
template <class T> using is_integral = typename std::is_integral<T>;
template <class T>
using is_signed_int =
typename std::conditional<is_integral<T>::value && std::is_signed<T>::value,
std::true_type,
std::false_type>::type;
template <class T>
using is_unsigned_int =
typename std::conditional<is_integral<T>::value &&
std::is_unsigned<T>::value,
std::true_type,
std::false_type>::type;
template <class T>
using to_unsigned = typename std::conditional<is_signed_int<T>::value,
std::make_unsigned<T>,
std::common_type<T>>::type;
#endif
template <class T>
using is_signed_int_t = std::enable_if_t<is_signed_int<T>::value>;
template <class T>
using is_unsigned_int_t = std::enable_if_t<is_unsigned_int<T>::value>;
template <class T> using to_unsigned_t = typename to_unsigned<T>::type;
} // namespace internal
} // namespace atcoder
#include <cassert>
#include <vector>
namespace atcoder {
// Reference: https://en.wikipedia.org/wiki/Fenwick_tree
template <class T> struct fenwick_tree {
using U = internal::to_unsigned_t<T>;
public:
fenwick_tree() : _n(0) {}
fenwick_tree(int n) : _n(n), data(n) {}
void add(int p, T x) {
assert(0 <= p && p < _n);
p++;
while (p <= _n) {
data[p - 1] += U(x);
p += p & -p;
}
}
T sum(int l, int r) {
assert(0 <= l && l <= r && r <= _n);
return sum(r) - sum(l);
}
private:
int _n;
std::vector<U> data;
U sum(int r) {
U s = 0;
while (r > 0) {
s += data[r - 1];
r -= r & -r;
}
return s;
}
};
} // namespace atcoder
using lint = long long;
void solve() {
int n, q;
std::cin >> n >> q;
std::vector<int> xs(n);
for (auto& x : xs) {
std::cin >> x;
--x;
}
std::vector<lint> fore(n + 1, 0); // [0, i)
{
atcoder::fenwick_tree<lint> bit(n);
for (int i = 0; i < n; ++i) {
fore[i + 1] = fore[i] + bit.sum(xs[i] + 1, n);
bit.add(xs[i], 1);
}
}
std::vector<lint> back(n + 1, 0); // [i, n)
{
atcoder::fenwick_tree<lint> bit(n);
for (int i = n - 1; i >= 0; --i) {
back[i] = back[i + 1] + bit.sum(0, xs[i]);
bit.add(xs[i], 1);
}
}
while (q--) {
int l, r;
std::cin >> l >> r;
--l; // [l, r)
// [0, l)と[r, n)
lint ans = fore[l] + back[r];
std::vector<lint> inv(n, 0);
std::vector<lint> fs(n, 0); // [i, n)
for (int i = 0; i < l; ++i) ++fs[xs[i]];
{
lint acc = 0;
for (int i = n - 1; i >= 0; --i) {
inv[i] += acc;
acc += fs[i];
fs[i] = acc;
}
}
{
std::vector<lint> bs(n, 0);
for (int i = r; i < n; ++i) ++bs[xs[i]];
lint acc = 0;
for (int i = 0; i < n; ++i) {
if (i + 1 < n) ans += fs[i + 1] * bs[i];
inv[i] += acc;
acc += bs[i];
}
}
ans += *std::min_element(inv.begin(), inv.end()) * (r - l);
std::cout << ans << "\n";
}
}
int main() {
std::cin.tie(nullptr);
std::ios::sync_with_stdio(false);
solve();
return 0;
}