#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
//#pragma GCC optimize("-O3")
//#pragma GCC optimize("unroll-loops")
//#pragma GCC optimize("-Ofast")
#define N 200500
#define NN 1005000
#define PB push_back
//#define endl '\n'
#define pri(x) cout << x << endl
#define _ << " " <<
#define all(x) x.begin(), x.end()
#define sz(x) int(x.size())
#define M ll(1e9 + 7)
#define F first
#define S second
using namespace std;
//using namespace __gnu_pbds;
typedef long long ll;
typedef long double ld;
typedef short int si;
typedef unsigned long long ull;
//typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;
//ordered_set se;
void TL()
{
while (1)
{
}
}
int n, q;
unordered_map <int, int> mp[N];
int ask(int l, int r)
{
if (mp[l].find(r) != mp[l].end())
return mp[l][r];
q--;
if (q == -1)
TL();
pri("?" _ l _ r);
int x;
cin >> x;
mp[l][r] = x;
return x;
}
char ans[N];
int main()
{
ios_base::sync_with_stdio(0); istream::sync_with_stdio(0); cin.tie(0); cout.tie(0);
//freopen("1.in", "r", stdin);
cin >> n >> q;
for (int i = 2; i <= n; i++)
ls[i] = i - 1;
nx[n] = ls[1] = -1;
for (int i = 1; i < n; i++)
nx[i] = i + 1;
for (int i = 1; i <= n; i++)
ans[i] = 'a';
int beg = 1;
while (1)
{
while (beg <= n && ans[beg] != 'a')
beg++;
if (beg > n)
break;
int cur = beg;
while (1)
{
int l = cur, r = nx[cur];
if (r == -1)
break;
if (ans[l] == 'a' && ans[r] == 'a' && ask(l, r))
{
ans[l] = '(';
ans[r] = ')';
int lst = ls[l];
int nxt = nx[r];
if (lst != -1)
nx[lst] = nxt;
if (nxt != -1)
ls[nxt] = lst;
}
cur = r;
}
}
cout << "! ";
for (int i = 1; i <= n; i++)
cout << ans[i];
cout << endl;
}
Compilation message
zagrade.cpp: In function 'int main()':
zagrade.cpp:78:9: error: 'ls' was not declared in this scope; did you mean 'ld'?
78 | ls[i] = i - 1;
| ^~
| ld
zagrade.cpp:80:5: error: 'nx' was not declared in this scope; did you mean 'n'?
80 | nx[n] = ls[1] = -1;
| ^~
| n
zagrade.cpp:80:13: error: 'ls' was not declared in this scope; did you mean 'ld'?
80 | nx[n] = ls[1] = -1;
| ^~
| ld
