제출 #1152470

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1152470		simuyu	Zagrade (COI20_zagrade)	C++20	0 / 100	3039 ms	416 KiB

zagrade

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define f first
#define s second

ll N, Q;
string res;


int main() {
    //ios_base::sync_with_stdio(false);
    //cin.tie(0);
    //cout.tie(0);

    cin >> N >> Q;

    for (ll i=0; i<N; i++) {
        res += "?";
    }


    ll left, right;

    int resp;

    ll qcnt = 0;
    for (ll sz=2; sz<=N; sz+=2) {
        ll startpt=0;
        while (startpt<=N-sz) {
            cout << "? " << startpt+1 << ' ' << startpt+sz << endl; // this is in their coordinates not ours
            cin >> resp;
            if (resp) {
                // is valid --> pattern known
                // from startpt to startpt+sz (inclusive, exclusive) is a "block"
                left = startpt;
                right = startpt+sz;

                while (right > left) {
                    while (res[right-1] != '?') {
                        right -= 2;
                        if (right<=left) break;
                    }
                    while (res[left] != '?') {
                        left += 2;
                        if (right<=left) break;
                    }

                    if (right <= left) break;

                    /*cout << "LEFT: " << left << ", RIGHT: " << right << "; ";
                    for (int i=left; i<right; i++) {
                        cout << res[i];
                    }
                    cout << endl;*/

                    // now the first and last are '(' and ')'
                    res[left] = '(';
                    res[right-1] = ')';
                    left++;
                    right--;
                }
                // set already yay

                //startpt += sz;
                //continue;
            }

            startpt++;

            qcnt ++;
            if (qcnt > Q) {
                while (true) {
                    qcnt++;
                }
            }
        }
    }

    cout << "! " << res << endl;

    return 0;
}

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• Subtask 2: 0 / 7
• Subtask 3: 0 / 57
• Subtask 4: 0 / 22