Submission #1107214

#	Time	Username	Problem	Language	Result	Execution time	Memory
1107214		thieunguyenhuy	Zagrade (COI20_zagrade)	C++17	100 / 100	802 ms	1700 KiB

zagrade

#include <bits/stdc++.h>
using namespace std;

#define popcount(n) (__builtin_popcountll((n)))
#define clz(n) (__builtin_clzll((n)))
#define ctz(n) (__builtin_ctzll((n)))
#define lg(n) (63 - __builtin_clzll((n)))
#define BIT(n, i) (((n) >> (i)) & 1ll)
#define MASK(i) (1ll << (i))
#define FLIP(n, i) ((n) ^ (1ll << (i)))
#define ON(n, i) ((n) | MASK(i))
#define OFF(n, i) ((n) & ~MASK(i))

#define Int __int128
#define fi first
#define se second

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<long long, long long> pll;
typedef pair<long long, int> pli;
typedef pair<int, long long> pil;
typedef vector<pair<int, int>> vii;
typedef vector<pair<long long, long long>> vll;
typedef vector<pair<long long, int>> vli;
typedef vector<pair<int, long long>> vil;

template <class T1, class T2>
bool maximize(T1 &x, T2 y) {
    if (x < y) {
        x = y;
        return true;
    }
    return false;
}
template <class T1, class T2>
bool minimize(T1 &x, T2 y) {
    if (x > y) {
        x = y;
        return true;
    }
    return false;
}

template <class T>
void remove_duplicate(vector<T> &ve) {
    sort (ve.begin(), ve.end());
    ve.resize(unique(ve.begin(), ve.end()) - ve.begin());
}

mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
template <class T> T random(T l, T r) {
    return uniform_int_distribution<T>(l, r)(rng);
}
template <class T> T random(T r) {
    return rng() % r;
}

const int N = 1e6 + 5;
const int MOD = 1e9 + 7;
const int inf = 1e9;
const ll INF = 1e18;

int n, q, asked = 0;

int ask(int l, int r) {
    assert(++asked <= q);
    cout << "? " << l << ' ' << r << endl;
    int ret; cin >> ret; return ret;
}

signed main() {
    ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);

    cin >> n >> q;

    string ans(n, '#'); int remain = n;

    stack<int> st;
    for (int i = 1; i <= n; ++i) {
        if (st.empty()) st.emplace(i);
        else {
            if (ask(st.top(), i)) {
                ans[st.top() - 1] = '(', ans[i - 1] = ')';
                remain -= 2; st.pop();
            }
            else st.emplace(i);
        }
    }

    for (int i = n; i > 0; --i) if (ans[i - 1] == '#') {
        if (remain > 0) ans[i - 1] = '(', remain -= 2;
        else ans[i - 1] = ')';
    }

    cout << "! " << ans << endl;
    cerr << '\n'; return 0;
}

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