Submission #1150946

#	Time	Username	Problem	Language	Result	Execution time	Memory
1150946		dolphy	Zagrade (COI20_zagrade)	C++20	100 / 100	252 ms	5224 KiB

zagrade

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define pb(a) push_back(a)
#define pp pop_back
#define mp(a, b) make_pair(a, b)
int32_t main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    int n, q;
    cin >> n >> q;
    set <int> s;
    set <int>::iterator x, y, it, it2;
    bool valid;
    char bracks[n+1];
    memset(bracks, 0, sizeof(bracks));
    for (int i=1; i<=n; i++) s.insert(i);
    x=s.begin(); y=s.begin(); y++;
    while (y!=s.end()) {
        cout << "? " << *x << " " << *y << "\n" << flush;
        cin >> valid;
        if (valid) {
            bracks[*x]='(';
            bracks[*y]=')';
            it=s.upper_bound(*y);
            s.erase(x); s.erase(y);
            if (s.empty()) break;
            it2=s.begin();
            if (it==it2) {
                x=it; y=it; y++;
            }
            else {
                y=it;
                it--;
                x=it;
            }
        }
        else {x++; y++;}
    }
    int cnt=0, cur=0;
    for (int i=1; i<=n; i++) if (bracks[i]==0) cnt++;
    cnt/=2;
    cout << "! ";
    for (int i=1; i<=n; i++) {
        if (bracks[i]==0) {
            cur++;
            if (cur>cnt) cout << "(";
            else cout << ")";
        }
        else cout << bracks[i];
    }
    cout << "\n";
    return 0;
}

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