Submission #412911

#	Time	Username	Problem	Language	Result	Execution time	Memory
412911		couplefire	Zagrade (COI20_zagrade)	C++17	100 / 100	1105 ms	1272 KiB

zagrade

#include <bits/stdc++.h>
#define in(x) freopen(x, "r", stdin)
#define out(x) freopen(x, "w", stdout)
//#include <time.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("unroll-loops")
//#pragma GCC optimize("-O3")
#define F first
#define S second
#define pb push_back
#define M ll(1e9 + 7)
//#define M ll(998244353)
#define sz(x) (int)x.size()
#define re return
#define oo ll(1e18)
#define el '\n'
#define pii pair <int, int>
#define all(x) (x).begin(), (x).end()
#define arr_all(x, n) (x + 1), (x + 1 + n)
#define vi vector<int>
#define eps (ld)1e-9
using namespace std;
typedef long long ll;
//using namespace __gnu_pbds;
//typedef tree <ll, null_type, less_equal <ll> , rb_tree_tag, tree_order_statistics_node_update> ordered_set;
typedef double ld;
typedef unsigned long long ull;
typedef short int si;
 
bool get(int l, int r) {
    int x;
    cout << "? " << l << " " << r << endl;
    cin >> x;
 
    return x;
}
 
int main()
{
	ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
 
    int n, q;
    cin >> n >> q;
    int last = 1;
 
    string ans = "";
 
    for (int i = 1; i <= n; i++) {
        ans += "X";
    }
 
    vector <int> op;
    int ccl = n / 2;
 
    for (int i = 1; i <= n; i++) {
        if (!sz(op)) {
            op.pb(i);
            continue;
        }
 
        bool is = get(op.back(), i);
 
        if (!is) {
            op.pb(i);
        }
        else {
            ans[op.back() - 1] = '(';
            ans[i - 1] = ')';
            ccl--;
            op.pop_back();
        }
    }
 
 
    for (int i = 0; i < n; i++) {
        if (ans[i] == 'X') {
            if (!ccl) {
                ans[i] = '(';
            }
            else {
                ans[i] = ')';
                ccl--;
            }
        }
    }
 
    cout << "! " << ans << endl;
}

Compilation message (stderr)

zagrade.cpp: In function 'int main()':
zagrade.cpp:46:9: warning: unused variable 'last' [-Wunused-variable]
   46 |     int last = 1;
      |         ^~~~

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