Submission #1152390

#	Time	Username	Problem	Language	Result	Execution time	Memory
1152390		kxd	Zagrade (COI20_zagrade)	C++20	100 / 100	235 ms	1344 KiB

zagrade

#include <bits/stdc++.h>
//#define DEBUG 1106
#define int long long
#define ll long long
#define ld long double
#define pb emplace_back
#define p_q priority_queue
#define m_p make_pair
#define pii pair<int,int>
#define endl '\n'
#define INIT ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define FOR(i,a,b) for(int i = a; i <= b; i++)
#define forn(i,n) for (int i = 0; i < n; i++)
#define forn1(i,n) for (int i = 1; i <= n; i++)
#define all(x) x.begin(),x.end()
#define ft first
#define sd second
#define lowbit(x) (x&(-x))
#define chmax(x,y) x=max(x,y)
#define chmin(x,y) x=min(x,y)
#ifdef DEBUG
#define debug(x) cout << #x << ": " << x << endl;
#else
#define debug(x) 1106;
#endif

using namespace std;
const int N = 1e6+5;
const int M = 2005;
const int inf = 1e9;
const int INF = 1e18;
const int MOD = 1e9+7;

char a[N];

signed main() {
	//INIT
	#ifdef DEBUG
	freopen("input.txt", "r", stdin);
	#endif
	///////////
	int n, q;
    cin >> n >> q;
    forn1(i,n) a[i] = 'x';
    stack<int> st;
    st.push(1);
    int curr = 2;
    int cnt = 0;
    while(curr<=n) {
        if(st.empty()) {
            st.push(curr);
            curr++;
        }
        int x = st.top();
        st.pop();
        cout << "? " << x << ' ' << curr << endl;
        int t;
        cin >> t;
        if(t==1) {
            a[x] = '(';
            a[curr] = ')';
            cnt += 2;
        } else {
            st.push(x);
            st.push(curr);
        }
        curr++;
    }
    
    int l = (n-cnt)/2;
    cout << "! ";
    forn1(i,n) {
        if(a[i]=='x') {
            if (l>0) cout << ')';
            else cout << '(';
            l--;
        } else cout << a[i];
    }
}

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