結果

問題 No.1951 消えたAGCT(2)
ユーザー RVindicatio
提出日時 2022-05-21 00:00:04
言語 C++17(gcc12)
(gcc 12.3.0 + boost 1.87.0)
結果
AC  
実行時間 531 ms / 3,000 ms
コード長 4,533 bytes
コンパイル時間 10,597 ms
コンパイル使用メモリ 276,748 KB
最終ジャッジ日時 2025-01-29 12:09:14
ジャッジサーバーID
(参考情報)
judge4 / judge5
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ファイルパターン 結果
other AC * 28
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include<bits/stdc++.h>
using namespace std;
using ll = long long;
const int INF = 1e9;
const ll inf = 1LL<<60;
using S = int;
S op(S a, S b) {
return a+b;
}
S e() {
return 0;
}
namespace internal {
// @param n `0 <= n`
// @return minimum non-negative `x` s.t. `n <= 2**x`
int ceil_pow2(int n) {
int x = 0;
while ((1U << x) < (unsigned int)(n)) x++;
return x;
}
// @param n `1 <= n`
// @return minimum non-negative `x` s.t. `(n & (1 << x)) != 0`
int bsf(unsigned int n) {
#ifdef _MSC_VER
unsigned long index;
_BitScanForward(&index, n);
return index;
#else
return __builtin_ctz(n);
#endif
}
}
template <class S, S (*op)(S, S), S (*e)()> struct segtree {
public:
segtree() : segtree(0) {}
segtree(int n) : segtree(std::vector<S>(n, e())) {}
segtree(const std::vector<S>& v) : _n(int(v.size())) {
log = internal::ceil_pow2(_n);
size = 1 << log;
d = std::vector<S>(2 * size, e());
for (int i = 0; i < _n; i++) d[size + i] = v[i];
for (int i = size - 1; i >= 1; i--) {
update(i);
}
}
void set(int p, S x) {
assert(0 <= p && p < _n);
p += size;
d[p] = x;
for (int i = 1; i <= log; i++) update(p >> i);
}
S get(int p) {
assert(0 <= p && p < _n);
return d[p + size];
}
void add(int p, S x = 1) {
assert(0 <= p && p < _n);
ll val = get(p) + x;
p += size;
d[p] = val;
for (int i = 1; i <= log; i++) update(p >> i);
}
S prod(int l, int r) {
assert(0 <= l && l <= r && r <= _n);
S sml = e(), smr = e();
l += size;
r += size;
while (l < r) {
if (l & 1) sml = op(sml, d[l++]);
if (r & 1) smr = op(d[--r], smr);
l >>= 1;
r >>= 1;
}
return op(sml, smr);
}
S all_prod() { return d[1]; }
template <bool (*f)(S)> int max_right(int l) {
return max_right(l, [](S x) { return f(x); });
}
template <class F> int max_right(int l, F f) {
assert(0 <= l && l <= _n);
assert(f(e()));
if (l == _n) return _n;
l += size;
S sm = e();
do {
while (l % 2 == 0) l >>= 1;
if (!f(op(sm, d[l]))) {
while (l < size) {
l = (2 * l);
if (f(op(sm, d[l]))) {
sm = op(sm, d[l]);
l++;
}
}
return l - size;
}
sm = op(sm, d[l]);
l++;
} while ((l & -l) != l);
return _n;
}
template <bool (*f)(S)> int min_left(int r) {
return min_left(r, [](S x) { return f(x); });
}
template <class F> int min_left(int r, F f) {
assert(0 <= r && r <= _n);
assert(f(e()));
if (r == 0) return 0;
r += size;
S sm = e();
do {
r--;
while (r > 1 && (r % 2)) r >>= 1;
if (!f(op(d[r], sm))) {
while (r < size) {
r = (2 * r + 1);
if (f(op(d[r], sm))) {
sm = op(d[r], sm);
r--;
}
}
return r + 1 - size;
}
sm = op(d[r], sm);
} while ((r & -r) != r);
return 0;
}
private:
int _n, size, log;
std::vector<S> d;
void update(int k) { d[k] = op(d[2 * k], d[2 * k + 1]); }
};
void solve() {
int n; cin >> n;
string s; cin >> s;
vector<int> alp(26);
for (int i=0; i<n; i++) alp[s[i] - 'A']++;
segtree<S, op, e> seg(n);
for (int i=0; i<n; i++) seg.set(i, 1);
int p = 0;
int ans = 0;
while (1) {
int cnt = alp[(-p+26)%26]+alp[(2-p+26)%26]+alp[(6-p+26)%26]+alp[(19-p+26)%26];
// cout << (6-p+26)%26 << " " << alp[(6-p+26)%26] << endl;
// cout << alp[2] << endl;
if (cnt == 0) break;
ans++;
int ng = 0, ok = n;
while (ok - ng > 1) {
int mid = (ok + ng) / 2;
(seg.prod(0, mid) >= cnt ? ok : ng) = mid;
}
seg.set(ok-1, 0);
alp[s[ok-1] - 'A']--;
p += alp[s[ok-1] - 'A'];
p %= 26;
// cout << cnt << " " << ok-1 << " " << p << endl;
}
cout << ans << '\n';
}
int main() {
ios::sync_with_stdio(false);
std::cin.tie(nullptr);
// int t; cin >> t;
/*while (t--)*/ solve();
}
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