Submission #1311115

#	Time	Username	Problem	Language	Result	Execution time	Memory
1311115		_Temirhan	Mađioničar (COI22_madionicar)	C++20	100 / 100	499 ms	404 KiB

Main

#include <bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>  
#include <ext/pb_ds/assoc_container.hpp>

using namespace std;
using namespace __gnu_pbds;

#if defined(__GNUC__) || defined(__clang__)
#pragma GCC optimize("Ofast,unroll-loops,inline-functions,no-stack-protector,03")
#pragma GCC target ("sse,sse2,sse3,ssse3,sse4,popcnt,abm,avx2,mmx,fma,avx,tune=native")
#pragma clang loop vectorize(enable)
#pragma clang loop interleave(enable)
#endif

#define int long long
#define sz(x) (int)x.size()
#define F first
#define S second
#define pb push_back
#define nl '\n'
#define o_set tree<int, null_type, less_equal<int>, rb_tree_tag, tree_order_statistics_node_update>
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
typedef pair<int, int> pii;

void file( string s = "" )
{
    if( s.empty() )
        return;
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}

const int N = 2e5 + 2;
const int N1 = 1e6 + 2;
const int inf = 1e9 + 2;
const int INF = 1e18 + 2;
const int mod = 1e9 + 7;
int T = 1;

int ask( int l, int r )
{
    cout <<"? " <<l <<' ' <<r <<endl;
    int x;
    cin >>x;
    return x;
}

void solve()
{
    int n;
    cin >>n;
    int ans = 1;
    for( int l = 1, r = 3; r <= n; ++l, ++r )
    {
        int ch = 0;
        while( 1 <= l && r <= n && ask(l, r) )
        {
            ans = max(ans, r - l + 1);
            --l;
            ++r;
        }
        l += ch;
        r -= ch;
    }
    for( int l = 1, r = ans + 1; r <= n; ++l, ++r )
    {
        int ch = 0;
        while( 1 <= l && r <= n && ask(l, r) )
        {
            ch = 1;
            ans = max(ans, r - l + 1);
            --l;
            ++r;
        }
        l += ch;
        r -= ch;
    }
    
    cout <<"! " <<ans <<endl;
}

signed main()
{
    // file("");
    // ios_base::sync_with_stdio(false);
    // cin.tie(nullptr);
    // cin >>T;
    while( T-- )
        solve();
}

Compilation message (stderr)

Main.cpp: In function 'void file(std::string)':
Main.cpp:29:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:30:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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