#include <bits/stdc++.h>
using namespace std;
#ifndef ATCODER_LAZYSEGTREE_HPP
#define ATCODER_LAZYSEGTREE_HPP 1
#include <algorithm>
#include <cassert>
#include <functional>
#include <vector>
#ifndef ATCODER_INTERNAL_BITOP_HPP
#define ATCODER_INTERNAL_BITOP_HPP 1
#ifdef _MSC_VER
#include <intrin.h>
#endif
#if __cplusplus >= 202002L
#include <bit>
#endif
namespace internal {
#if __cplusplus >= 202002L
using std::bit_ceil;
#else
// @return same with std::bit::bit_ceil
unsigned int bit_ceil(unsigned int n) {
unsigned int x = 1;
while (x < (unsigned int)(n)) x *= 2;
return x;
}
#endif
// @param n `1 <= n`
// @return same with std::bit::countr_zero
int countr_zero(unsigned int n) {
#ifdef _MSC_VER
unsigned long index;
_BitScanForward(&index, n);
return index;
#else
return __builtin_ctz(n);
#endif
}
// @param n `1 <= n`
// @return same with std::bit::countr_zero
constexpr int countr_zero_constexpr(unsigned int n) {
int x = 0;
while (!(n & (1 << x))) x++;
return x;
}
} // namespace internal
#endif // ATCODER_INTERNAL_BITOP_HPP
#if __cplusplus >= 201703L
template <class S,
auto op,
auto e,
class F,
auto mapping,
auto composition,
auto id>
struct lazy_segtree {
static_assert(std::is_convertible_v<decltype(op), std::function<S(S, S)>>,
"op must work as S(S, S)");
static_assert(std::is_convertible_v<decltype(e), std::function<S()>>,
"e must work as S()");
static_assert(
std::is_convertible_v<decltype(mapping), std::function<S(F, S)>>,
"mapping must work as F(F, S)");
static_assert(
std::is_convertible_v<decltype(composition), std::function<F(F, F)>>,
"compostiion must work as F(F, F)");
static_assert(std::is_convertible_v<decltype(id), std::function<F()>>,
"id must work as F()");
#else
template <class S,
S (*op)(S, S),
S (*e)(),
class F,
S (*mapping)(F, S),
F (*composition)(F, F),
F (*id)()>
struct lazy_segtree {
#endif
public:
lazy_segtree() : lazy_segtree(0) {}
explicit lazy_segtree(int n) : lazy_segtree(std::vector<S>(n, e())) {}
explicit lazy_segtree(const std::vector<S>& v) : _n(int(v.size())) {
size = (int)internal::bit_ceil((unsigned int)(_n));
log = internal::countr_zero((unsigned int)size);
d = std::vector<S>(2 * size, e());
lz = std::vector<F>(size, id());
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;
for (int i = log; i >= 1; i--) push(p >> i);
d[p] = x;
for (int i = 1; i <= log; i++) update(p >> i);
}
S get(int p) {
assert(0 <= p && p < _n);
p += size;
for (int i = log; i >= 1; i--) push(p >> i);
return d[p];
}
S prod(int l, int r) {
assert(0 <= l && l <= r && r <= _n);
if (l == r) return e();
l += size;
r += size;
for (int i = log; i >= 1; i--) {
if (((l >> i) << i) != l) push(l >> i);
if (((r >> i) << i) != r) push((r - 1) >> i);
}
S sml = e(), smr = e();
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]; }
void apply(int p, F f) {
assert(0 <= p && p < _n);
p += size;
for (int i = log; i >= 1; i--) push(p >> i);
d[p] = mapping(f, d[p]);
for (int i = 1; i <= log; i++) update(p >> i);
}
void apply(int l, int r, F f) {
assert(0 <= l && l <= r && r <= _n);
if (l == r) return;
l += size;
r += size;
for (int i = log; i >= 1; i--) {
if (((l >> i) << i) != l) push(l >> i);
if (((r >> i) << i) != r) push((r - 1) >> i);
}
{
int l2 = l, r2 = r;
while (l < r) {
if (l & 1) all_apply(l++, f);
if (r & 1) all_apply(--r, f);
l >>= 1;
r >>= 1;
}
l = l2;
r = r2;
}
for (int i = 1; i <= log; i++) {
if (((l >> i) << i) != l) update(l >> i);
if (((r >> i) << i) != r) update((r - 1) >> i);
}
}
template <bool (*g)(S)> int max_right(int l) {
return max_right(l, [](S x) { return g(x); });
}
template <class G> int max_right(int l, G g) {
assert(0 <= l && l <= _n);
assert(g(e()));
if (l == _n) return _n;
l += size;
for (int i = log; i >= 1; i--) push(l >> i);
S sm = e();
do {
while (l % 2 == 0) l >>= 1;
if (!g(op(sm, d[l]))) {
while (l < size) {
push(l);
l = (2 * l);
if (g(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 (*g)(S)> int min_left(int r) {
return min_left(r, [](S x) { return g(x); });
}
template <class G> int min_left(int r, G g) {
assert(0 <= r && r <= _n);
assert(g(e()));
if (r == 0) return 0;
r += size;
for (int i = log; i >= 1; i--) push((r - 1) >> i);
S sm = e();
do {
r--;
while (r > 1 && (r % 2)) r >>= 1;
if (!g(op(d[r], sm))) {
while (r < size) {
push(r);
r = (2 * r + 1);
if (g(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;
std::vector<F> lz;
void update(int k) { d[k] = op(d[2 * k], d[2 * k + 1]); }
void all_apply(int k, F f) {
d[k] = mapping(f, d[k]);
if (k < size) lz[k] = composition(f, lz[k]);
}
void push(int k) {
all_apply(2 * k, lz[k]);
all_apply(2 * k + 1, lz[k]);
lz[k] = id();
}
};
#endif // ATCODER_LAZYSEGTREE_HPP
using S = pair<int, int>;
using F = int;
S op(S a, S b){ return {min(a.first, b.first), max(a.second, b.second)}; }
S e(){ return {int(1e9)+1, int(-1e9)+1}; }
S mapping(F f, S x){ return {x.first + f, x.second + f}; }
F composition(F f, F g){ return f+g; }
F id(){ return 0; }
int main() {
int n;
cin >> n;
vector<S> v(n, {0, 0});
lazy_segtree<S, op, e, F, mapping, composition, id> seg(v);
for (int i = 0; i < n; i++) {
int r, s;
cin >> r >> s;
if (s == 1) {
seg.apply(0, r, +1);
} else {
seg.apply(0, r, -1);
}
auto [min_, max_] = seg.all_prod();
if (min_ < 0 && max_ > 0) {
cout << "?" << endl;
} else if (min_ < 0) {
cout << "<" << endl;
} else if (max_ > 0) {
cout << ">" << endl;
} else {
assert(false);
}
}
}
Compilation message
stones.cpp: In function 'int main()':
stones.cpp:289:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
289 | auto [min_, max_] = seg.all_prod();
| ^
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
348 KB |
Output is correct |
| 2 |
Correct |
0 ms |
348 KB |
Output is correct |
| 3 |
Correct |
1 ms |
348 KB |
Output is correct |
| 4 |
Correct |
0 ms |
348 KB |
Output is correct |
| 5 |
Correct |
1 ms |
348 KB |
Output is correct |
| 6 |
Correct |
1 ms |
348 KB |
Output is correct |
| 7 |
Correct |
2 ms |
348 KB |
Output is correct |
| 8 |
Correct |
2 ms |
348 KB |
Output is correct |
| 9 |
Correct |
2 ms |
348 KB |
Output is correct |
| 10 |
Correct |
15 ms |
604 KB |
Output is correct |
| 11 |
Correct |
101 ms |
2644 KB |
Output is correct |
| 12 |
Correct |
151 ms |
3676 KB |
Output is correct |
| 13 |
Correct |
163 ms |
3820 KB |
Output is correct |
| 14 |
Correct |
162 ms |
3920 KB |
Output is correct |
| 15 |
Correct |
164 ms |
3844 KB |
Output is correct |
| 16 |
Correct |
165 ms |
3920 KB |
Output is correct |
| 17 |
Correct |
163 ms |
3924 KB |
Output is correct |
| 18 |
Correct |
166 ms |
4624 KB |
Output is correct |
| 19 |
Correct |
199 ms |
3924 KB |
Output is correct |
| 20 |
Correct |
167 ms |
3932 KB |
Output is correct |
| 21 |
Correct |
168 ms |
4188 KB |
Output is correct |
| 22 |
Correct |
177 ms |
4160 KB |
Output is correct |
| 23 |
Correct |
162 ms |
3816 KB |
Output is correct |
| 24 |
Correct |
166 ms |
3924 KB |
Output is correct |
| 25 |
Correct |
175 ms |
3844 KB |
Output is correct |
