Submission #1346501

#	Time	Username	Problem	Language	Result	Execution time	Memory
1346501		retarde	Light Bulbs (EGOI24_lightbulbs)	C++20	63.89 / 100	108 ms	612 KiB

Main

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

#define pb push_back
#define pf push_front
#define mp make_pair
#define fi first
#define se second
#define int long long
#define all(x) (x).begin(), (x).end()

typedef long double ld;
typedef long long ll;
typedef pair<ll,ll> pll;
typedef pair<int,int> pii;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<bool> vb;
typedef vector<vector<int>> vvi;
typedef vector<vector<bool>> vvb;
typedef vector<vector<ll>> vvll;
typedef vector<string> vs;
typedef vector<vector<string>> vvs;
typedef vector<char> vc;
typedef vector<vector<char>> vvc;
typedef map<int, int> mii;
typedef unordered_map<int, int> umii;

const int mod = 1e9 + 7;
const int inf = INTMAX_MAX;
const bool tc = false;

int query(vvi &g) {
    cout << "?\n";
    for (auto &x : g) {
        for (auto &y : x) cout << y;
        cout << '\n';
    }
    cout.flush();
    int x; cin >> x;
    return x;
}

void answer(vvi &g) {
    cout << "!\n";
    for (auto &x : g) {
        for (auto &y : x) cout << y;
        cout << '\n';
    }
    cout.flush();
}

int n;
inline void solve() {
    cin >> n;
    vvi ans(n, vi(n));
    vector<pii> ds;
    for (int i = 0; i < n; i++) {
        // iterate over columns
        int lo = 0; int hi = n;
        pii ch = {-1, -1};
        while (hi > lo + 1) {
            int mid = (lo + hi) / 2;
            vvi g(n, vi(n));
            for (int r = 0; r <= mid; r++) g[r][i]=1;
            int c = query(g);
            ch = max(ch, {mid+1, c});
            if (c < (mid+1)*n) hi = mid;
            else lo = mid;
        }
        // lo is the guy
        if (hi == n) {
            // no verticals, every horizontal
            vvi tmp(n, vi(n));
            for (int r = 0; r < n; r++) tmp[r][i] = 1;
            answer(tmp);
            return;
        }

        // cout << "h " << ch.fi << " " << ch.se << '\n';

        if (hi != 1) ans[hi][i]=1;
        else {
            // brah
            if (ch.fi <= 2) {
                vvi tmp2(n, vi(n));
                for (int r = 0; r < n; r++) tmp2[r][i]=1;
                int k = query(tmp2);
                ch = {n, k};
            }
            // check without the 1st
            vvi tmp3(n, vi(n));
            for (int r = 1; r < ch.fi; r++) tmp3[r][i]=1;
            int k2 = query(tmp3);
            int dlt = ch.se-k2;
            // if its n, then dc
            if (dlt < n - 1) {
                ans[0][i] = 1;
            } else {
                ans[1][i] = 1;
            }
        }
    }
        // for (auto &x : ds) cout << x.fi << " " << x.se << '\n';
    answer(ans);
}

void setIO(string s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}

signed main() {
    ios::sync_with_stdio(false);
    cout.tie(0);
    cin.tie(0);
    //setIO();

    int t = 1;
    if (tc) {
        cin >> t;
    }

    while (t--) {
        solve();
    }
}

Compilation message (stderr)

Main.cpp: In function 'void setIO(std::string)':
Main.cpp:109:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  109 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:110:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  110 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 11 / 11
• Subtask 2: 11 / 11
• Subtask 3: 41.8889 / 78