제출 #1274133

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1274133		choed	Mađioničar (COI22_madionicar)	C++20	25 / 100	492 ms	424 KiB

Main

#include <bits/stdc++.h>
#define GO_BEYOND ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define ll long long
#define fi first
#define se second
#define pll pair<ll, ll>
#define plll pair<ll,pll>
using namespace std;

ll query(ll l, ll r){
    cout << "? " << l << ' ' << r << endl;
    ll ret; cin >> ret;
    return ret; 
}

void solve(){
    ll n; cin >> n;
    
    ll ans=0;
    // case ganjil
    ll lp=1, rp=3, val;
    while(rp<=n){
        if(lp<=0){
            lp++; rp++;
        }else{
            val=query(lp, rp);
            if(val){
                ans=max(ans, rp-lp+1);
                lp--; rp++;
            }else{
                lp++; rp++;
            }
        }
    }

    // case genap
    lp=1; rp=2;
    while(rp<=n){
        if(lp<=0){
            lp++; rp++;
        }else{
            val=query(lp, rp);
            if(val){
                ans=max(ans, rp-lp+1);
                lp--; rp++;
            }else{
                lp++; rp++;
            }
        }
    }
    cout << "! " << ans << endl;
}

/*
g++ sigma.cpp -o a
neven
kasurrusak
*/

int main(){
    GO_BEYOND;
    ll t=1;
    // cin >> t;
    while(t--) 
        solve();
}

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