Submission #781303

#	Time	Username	Problem	Language	Result	Execution time	Memory
781303		devariaota	Zagrade (COI20_zagrade)	C++17	100 / 100	744 ms	800 KiB

zagrade

#include<bits/stdc++.h>

using namespace std;

#define fi first
#define se second
#define pii pair<int,int>
#define pll pair<long long, long long>

int n,q,sisa;
stack<int> st;
char s[100069];

int main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    int i,j;
    cin>>n>>q;
    sisa = n/2;
    for(i=1;i<=n and q;i++)
    {
        if(st.empty())
        {
            st.push(i);
            continue;
        }
        cout<<"? "<<st.top()<<" "<<i<<'\n';
        cout.flush();
        bool valid;
        cin>>valid;
        if(valid)
        {
            s[st.top()] = '(';
            s[i] = ')';
            sisa--;
            st.pop();
        }
        else
        {
            st.push(i);
        }
        q--;
    }
    for(j=i;j<=n;j++) st.push(j);
    while(!st.empty())
    {
        int x = st.top();
        st.pop();
        if(sisa)
        {
            s[x] = '(';
            sisa--;
        }
        else
        {
            s[x] = ')';
        }
    }
    cout<<"! ";
    for(i=1;i<=n;i++)
    {
        cout<<s[i];
        if(i == n)
        {
            cout<<'\n';
        }
    }
    // )())(()(
}

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