Submission #1027039

#	Time	Username	Problem	Language	Result	Execution time	Memory
1027039		VMaksimoski008	Mađioničar (COI22_madionicar)	C++17	13 / 100	1267 ms	12880 KiB

Main

#include <bits/stdc++.h>

#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
//#define int long long

using namespace std;

using ll = long long;
using pii = pair<int, int>;
using pll = pair<ll, ll>;

const int mod = 1e9 + 7;
const int LOG = 20;
const int maxn = 1e5 + 5;

map<pii, int> mp;

int query(int l, int r) {
    if(mp.count({ l, r })) return mp[{ l, r }];
    cout << "? " << l << " " << r << endl;
    int x;
    cin >> x;
    return mp[{ l, r }] = x;
}

signed main() {
    int n;
    cin >> n;

    int l=2, r=(n-1)/2, ans=1;
    while(l <= r) {
        int mid = (l + r) / 2, ok = 0;
        int len = 2 * mid + 1;
        for(int i=1; i+len-1<=n; i++) {
            if(query(i, i+len-1)) {
                ok = 1;
                break;
            }
        }

        if(ok) ans = len, l = mid + 1;
        else r = mid - 1;
    }

    l=1, r=n/2;
    int ans2=0;
    while(l <= r) {
        int mid = (l + r) / 2, ok = 0;
        int len = 2 * mid;
        for(int i=1; i+len-1<=n; i++) {
            if(query(i, i+len-1)) {
                ok = 1;
                break;
            }
        }

        if(ok) ans2 = len, l = mid + 1;
        else r = mid - 1;
    }

    cout << "! " << max(ans, ans2) << endl;
    return 0;
}

• Subtask 1: 13 / 13
• Subtask 2: 0 / 25
• Subtask 3: 0 / 25
• Subtask 4: 0 / 37