Submission #1015877

#	Time	Username	Problem	Language	Result	Execution time	Memory
1015877		12345678	Zagrade (COI20_zagrade)	C++17	0 / 100	588 ms	1392 KiB

zagrade

#include <bits/stdc++.h>

using namespace std;

const int nx=1e5+5;

int n, res[nx], x, q;

int query(int l, int r)
{
    cout<<"? "<<l<<' '<<r<<'\n';
    fflush(stdout);
    cin>>x;
    return x;
}

void fillres(int l, int r)
{
    int md=(l+r)/2;
    for (int i=l; i<=md; i++) res[i]=1;
}

void solve2(int l, int r)
{
    if (r<l) return;
    int lst=l;
    for (int i=l+1; i<r; i+=2) if (query(l, i)) fillres(lst, i), lst=i+1;
    fillres(lst, r);
}

void solve1(int l, int r)
{
    res[l]=1;
    for (int i=l+1; i<r; i+=2) if (query(l, i)) return solve2(l+1, i-1), solve1(i+1, r), void();
    solve2(l+1, r-1);
}

int main()
{
    cin>>n>>q;
    solve1(1, n);
    cout<<"! ";
    for (int i=1; i<=n;i ++) cout<<(res[i]?'(':')');
}

• Subtask 1: 0 / 14
• Subtask 2: 0 / 7
• Subtask 3: 0 / 57
• Subtask 4: 0 / 22