Submission #995724

#	Time	Username	Problem	Language	Result	Execution time	Memory
995724		Essa2006	Zagrade (COI20_zagrade)	C++14	100 / 100	630 ms	1580 KiB

zagrade

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define FF first
#define SS second
#define all(a) a.begin(), a.end()
#define mod (ll)(1000000007)
bool ask(int l, int r){
    int val;
    cout<<"? "<<l<<' '<<r<<endl;
    cin>>val;
    return val;
}
int main(){
    ios_base::sync_with_stdio(0);cin.tie(0);
    int n, q;
    cin>>n>>q;
    int a=n/2,b=n/2;
    vector<int>Ans(n+1), stk;
    for(int i=1;i<=n;i++){
        if(stk.empty()){
            stk.push_back(i);
        }
        else{
            bool val=ask(stk.back(), i);
            if(val){
                Ans[stk.back()]=1, Ans[i]=2;
                stk.pop_back();
                a--, b--;
            }
            else{
                stk.push_back(i);
            }
        }
    }
    cout<<"! ";
    for(int i=1;i<=n;i++){
        char c;
        if(Ans[i]){
            c='('+Ans[i]-1;
        }
        else{
            if(a)
                c=')', a--;
            else
                c='(';
        }
        cout<<c;
    }
}

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