#include<bits/stdc++.h>
using namespace std;
#define fast ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define in insert
#define all(x) x.begin(),x.end()
#define pb push_back
#define eb emplace_back
#define ff first
#define ss second
// #define int long long
typedef long long ll;
typedef vector<int> vi;
typedef set<int> si;
typedef multiset<int> msi;
typedef pair<int, int> pii;
typedef vector<pii> vpii;
// typedef pair<int, int> P;
template<typename T, typename U>
ostream & operator << (ostream &out, const pair<T, U> &c) {
out << c.first << ' ' << c.second;
return out;
}
template<typename T>
ostream & operator << (ostream &out, vector<T> &v) {
const int sz = v.size();
for (int i = 0; i < sz; i++) {
if (i) out << ' ';
out << v[i];
}
return out;
}
template<typename T>
istream & operator >> (istream &in, vector<T> &v) {
for (T &x : v) in >> x;
return in;
}
template<typename T, typename U>
istream & operator >> (istream &in, pair<T, U> &c) {
in >> c.first;
in >> c.second;
return in;
}
template<typename T>
void mxx(T &a, T b){if(b > a) a = b;}
template<typename T>
void mnn(T &a, T b){if(b < a) a = b;}
const int mxn = 1e5 + 10, MXLOG = 22, mod = 1e9 + 7, P = 1181, D = 1523, N = 2500;
const long long inf = 2e18 + 10;
int p[mxn];
int ask(int l, int r) {
cout << l << ' ' << r << endl;
int res;
cin >> res;
return res;
}
void go() {
int n;
cin >> n;
p[1] = 0;
int l = 1, r = 1;
for(int i = 2; i <= n; i++) {
p[i] = max(0, min(r - i, p[l + (r - i)]));
while(i - p[i] - 1 >= 1 && i + p[i] + 1 <= n) {
if(ask(i - p[i] - 1, i + p[i] + 1) == 1) p[i]++;
else break;
}
if(i + p[i] > r) {
l = i - p[i];
r = i + p[i];
}
}
int ans = 0;
for(int i = 1; i <= n; i++) {
mxx(ans, p[i] * 2 + 1);
p[i] = 0;
}
l = 0, r = 0;
for(int i = 2; i <= n; i++) {
p[i] = max(0, min(r - i, (l + (r - i) > 0 ? p[l + (r - i)] : 0)));
while(i - p[i] - 1 >= 1 && i + p[i] <= n) {
if(ask(i - p[i] - 1, i + p[i]) == 1) p[i]++;
else break;
}
if(i + p[i] > r) {
l = i - p[i] + 1;
r = i + p[i];
}
}
for(int i = 1; i <= n; i++) {
mxx(ans, p[i] * 2);
}
cout << "! " << ans << endl;
}
signed main() {
fast;
int t = 1;
// cin >> t;
while(t--) {
go();
}
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
0 ms |
460 KB |
Execution killed with signal 13 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
0 ms |
460 KB |
Execution killed with signal 13 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
0 ms |
456 KB |
Execution killed with signal 13 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
0 ms |
460 KB |
Execution killed with signal 13 |
| 2 |
Halted |
0 ms |
0 KB |
- |
