Submission #593522

#	Time	Username	Problem	Language	Result	Execution time	Memory
593522		jiahng	Zagrade (COI20_zagrade)	C++14	100 / 100	828 ms	1248 KiB

zagrade

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
#define int ll
typedef pair<int,ll> pi;
typedef vector <int> vi;
typedef vector <pi> vpi;
typedef pair<pi, ll> pii;
typedef set <ll> si;
typedef long double ld;
#define f first
#define s second
#define mp make_pair
#define for(i,s,e) for(int i=s;i<=int(e);++i)
#define dec(i,s,e) for(int i=s;i>=int(e);--i)
#define pb push_back
#define all(x) (x).begin(), (x).end()
#define lbd(x, y) lower_bound(all(x), y)
#define ubd(x, y) upper_bound(all(x), y)
#define afor(i,x) for (auto i: x)
#define mem(x,i) memset(x,i,sizeof x)
#define fast ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0)
#define maxn 500100
#define inf (ll)1e14
#define mod 1000000007
#define getchar_unlocked _getchar_nolock

int n,q;
char ans[maxn];

bool qry(int a,int b){
    cout << "? " << a << ' ' << b << '\n';
    cout.flush();
    bool res; cin >> res;
    return res;
}
int32_t main(){
    fast;
    cin >> n >> q;
    stack <int> st; st.push(1);
    for(i,2,n){
        if (!st.empty() && qry(st.top(), i)){
            ans[i] = ')'; ans[st.top()] = '('; st.pop();
        }else st.push(i);
    }
    int m = st.size();
    for(i,1,m){
        ans[st.top()] = (i <= m/2 ? '(' : ')'); st.pop();
    }
    cout << "! "; for(i,1,n) cout << ans[i]; cout << '\n';
    cout.flush();
}

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