#include <bits/stdc++.h>
using namespace std;
#ifdef MIKU
string dbmc = "\033[1;38;2;57;197;187m", dbrs = "\033[0m";
#define debug(x...) cout << dbmc << "[" << #x << "]: ", dout(x)
void dout() { cout << dbrs << endl; }
template <typename T, typename ...U>
void dout(T t, U ...u) { cout << t << (sizeof...(u) ? ", " : ""); dout(u...); }
#else
#define debug(...) 39
#endif
#define fs first
#define sc second
#define mp make_pair
#define FOR(i, j, k) for (int i = j, Z = k; i < Z; i++)
using ll = long long;
typedef pair<int, int> pii;
const int MXN = 200005;
int n;
int N;
map<pii, int> M;
int fquery(int l, int r) {
cout << "? " << l << ' ' << r << endl;
int x;
cin >> x;
return x;
}
int query(int l, int r) {
// [l, r]
auto fquery = [&](int l, int r) -> int {
if (l == r) return 1;
cout << "? " << l << ' ' << r << endl;
int x;
cin >> x;
return x;
};
if (l <= 0 || r > N) return 0;
if (l & 1) l++;
if (r & 1) r--;
l /= 2;
r /= 2;
auto it = M.find(mp(l, r));
return (it == M.end() ? (M[mp(l, r)] = fquery(l, r)) : it -> sc);
}
namespace MANACHER {
int m[MXN], l;
void DO() {
m[1] = 0;
m[2] = 1;
l = 2;
FOR(i, 3, N + 1) {
if (i >= l + m[l] + 1) {
while (true) {
if (query(i - m[i] - 1, i + m[i] + 1) == 0) break;
m[i]++;
}
l = i;
} else {
int i_ = 2 * l - i;
if (i_ - m[i_] == l - m[l]) {
m[i] = m[i_];
while (true) {
if (query(i - m[i] - 1, i + m[i] + 1) == 0) break;
m[i]++;
}
l = i;
} else if (i_ - m[i_] < l - m[l]) {
m[i] = i_ + m[l] - l;
} else {
m[i] = m[i_];
}
}
}
}
}
void miku() {
cin >> n;
N = 2 * n + 1;
MANACHER::DO();
// int ans = 0;
// FOR(1, N + 1) {
// if (i & 1)
// }
cout << *max_element(MANACHER::m + 1, MANACHER::m + N + 1) << '\n';
}
int32_t main() {
cin.tie(0) -> sync_with_stdio(false);
cin.exceptions(cin.failbit);
miku();
return 0;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
64 ms |
1744 KB |
invalid token |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
64 ms |
1744 KB |
invalid token |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
834 ms |
11188 KB |
invalid token |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
64 ms |
1744 KB |
invalid token |
2 |
Halted |
0 ms |
0 KB |
- |