Submission #1120169

#	Time	Username	Problem	Language	Result	Execution time	Memory
1120169		12345678	Zagrade (COI20_zagrade)	C++17	0 / 100	63 ms	436 KiB

zagrade

#include <bits/stdc++.h>

using namespace std;

const int nx=1e3+5;

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

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

void solve(int l, int r)
{
    if (l<1||r>n||res[l]||res[r]) return;
    if (query(l, r)) res[l]=1, res[r]=2, cnt+=2, solve(l-1, r+1);
}

int main()
{
    //cin.tie(NULL)->sync_with_stdio(false);
    cin>>n>>q;
    for (int i=1; i<=n; i++)
    {
        if (res[i]) continue;
        solve(i, i+1);
    }
    cnt=(n-cnt)/2;
    for (int i=1; i<=n; i++)
    {
        if (!res[i]&&cnt>0) cnt--, res[i]=2;
        else res[i]=1;
    }
    cout<<"! ";
    for (int i=1; i<=n; i++) cout<<((res[i]==1)?'(':')');
    fflush(stdout);
}

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