Submission #550795

#	Time	Username	Problem	Language	Result	Execution time	Memory
550795		Killer2501	Zagrade (COI20_zagrade)	C++14	100 / 100	889 ms	15132 KiB

zagrade

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define ull unsigned long long
#define pb push_back
#define pll pair<int, pii>
#define pii pair<int, int>
#define fi first
#define se second
using namespace std;
const int N = 2e5+5;
const int M = 350;
const int mod = 1e9+7;
const ll base = 75;
const ll inf = 1e12;
int n, t, tong;
int k, m, a[N], b[N], c[N];
ll ans, dp[N], d[N];
vector<int> adj[N], gr[N];
vector<int> g[N], vi;
void sol()
{
    cin >> n >> t;
    vi.pb(1);
    m = n/2;
    for(int i = 2; i <= n; i ++)
    {
        if(vi.empty())vi.pb(i);
        else
        {
            cout <<"? "<< vi.back() <<" "<<i<<endl;
            cin >> k;
            if(k)
            {
                a[vi.back()] = 1;
                a[i] = 2;
                --m;
                vi.pop_back();
            }
            else vi.pb(i);
        }
    }
    cout << "! ";
    for(int i = 1; i <= n; i ++)
    {
        if(a[i] == 1)cout << '(';
        else if(a[i] == 2)cout << ')';
        else
        {
            if(m > 0)
            {
                cout << ')';
                --m;
            }
            else cout << '(';
        }
    }
}
int main()
{
    cin.tie(0);
    cout.tie(0);
    ios_base::sync_with_stdio(0);
    #define task "tests"
    if(fopen(task".inp", "r"))
	{
		freopen(task".inp", "r", stdin);
		freopen(task".out", "w", stdout);
	}
    int test = 1;
    //cin >> test;
    while(test -- > 0)sol();
    return 0;
}

Compilation message (stderr)

zagrade.cpp: In function 'int main()':
zagrade.cpp:67:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   67 |   freopen(task".inp", "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
zagrade.cpp:68:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   68 |   freopen(task".out", "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 14 / 14
• Subtask 2: 7 / 7
• Subtask 3: 57 / 57
• Subtask 4: 22 / 22