Submission #1274116

#	Time	Username	Problem	Language	Result	Execution time	Memory
1274116		oswaldzz	Mađioničar (COI22_madionicar)	C++20	0 / 100	481 ms	428 KiB

Main

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define nl endl
#define hehe ios_base::sync_with_stdio(0); cin.tie(NULL); cout.tie(NULL)  ;

// const int mod = 998244353;
const int mod = 1e9+7;
const int M = 2e5+5;

int gas(int l, int r){
    cout << "? " << l << ' ' << r << nl;
    cout.flush();
    int x; cin >> x;
    return x;
}

void solve(){
    int n; cin >> n;
    int ans = 1;

    for(int i = 2; i <= n-1; i++){
        int l = i, r = i;
        while(l > 1 && r < n){
            if(gas(l-1, r+1) == 1){
                l--; r++;
            }
            else break;
        }
        ans = max(ans, r - l + 1);
    }

    for(int i = 1; i <= n-1; i++){
        int l = i, r = i+1;
        if(gas(l, r) != 1) continue;
        while(l > 1 && r < n){
            if(gas(l-1, r+1) == 1){
                l--; r++;
            } 
            else break;
        }
        ans = max(ans, r - l + 1);
    }

    cout << "! " << ans << nl;
}

signed main(){
    hehe
    // int t; cin >> t;
    int t = 1;
    while(t--){
        solve();
    }
    return 0;
}

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