Submission #1137854

#	Time	Username	Problem	Language	Result	Execution time	Memory
1137854		eysbutno	Sateliti (COCI20_satellti)	C++20	50 / 110	735 ms	487056 KiB

Main

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

using ll = long long;
using pii = array<int, 2>;

#define all(x) begin(x), end(x)
#define sz(x) (int) (x).size()

mt19937 rng((uint32_t)chrono::steady_clock::now().time_since_epoch().count());

const ll M = (1ll << 61) - 1;
const ll B = uniform_int_distribution<ll>(1, M - 1)(rng);

constexpr int LG = 10;
using Info = array<ll, LG>;

int main() {
    cin.tie(0) -> sync_with_stdio(0);
    int n, m;
    cin >> n >> m;
    vector grid(2 * n, vector<bool>(2 * m));
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            char c;
            cin >> c;
            bool v = (c == '.');
            grid[i][j] = v;
            grid[i + n][j] = v;
            grid[i][j + m] = v;
            grid[i + n][j + m] = v;
        }
    }

    const auto mul = [](ll a, ll b) -> ll {
        return __int128_t(a) * b % M;
    };

    vector<ll> pows(n * m + 1);
    pows[0] = 1;
    for (int i = 1; i <= n * m; i++) {
        // pows[i] = (pows[i - 1] * B) % M;
        pows[i] = mul(pows[i - 1], B);
    }

    vector lr(2 * n, vector<Info>(m));
    vector lc(2 * n, vector<Info>(2 * m));

    int row = n - 1, col = m - 1;
    for (int i = 2 * n - 1; i >= 0; i--) {
        for (int j = 2 * m - 1; j >= 0; j--) {
            lc[i][j][0] = grid[i][j];
            for (int k = 1; k < LG; k++) {
                if (j + (1 << k) > 2 * m) { break; }
                const int nxt = j + (1 << (k - 1));
                // lc[i][j][k] = (lc[i][j][k - 1] + pows[1 << (k - 1)] * lc[i][nxt][k - 1]) % M;
                lc[i][j][k] = (lc[i][j][k - 1] + mul(pows[1 << (k - 1)], lc[i][nxt][k - 1])) % M;
            } 
        }

        ll cur = 0;
        for (int j = 2 * m - 1; j >= m; j--) {
            // cur = (cur * B + grid[i][j]) % M;
            cur = (mul(cur, B) + grid[i][j]) % M;
        }

        for (int j = m - 1; j >= 0; j--) {
            // cur -= pows[m - 1] * grid[i][j + m];
            cur -= mul(pows[m - 1], grid[i][j + m]);
            (cur += M) %= M;
            // cur = (cur * B + grid[i][j]) % M;
            cur = (mul(cur, B) + grid[i][j]) % M;
            lr[i][j][0] = cur;
            for (int k = 1; k < LG; k++) {
                if (i + (1 << k) > 2 * n) { continue; }
                const int nxt = i + (1 << (k - 1));
                // lr[i][j][k] = (lr[i][j][k - 1] + pows[1 << (k - 1)] * lr[nxt][j][k - 1]) % M;
                lr[i][j][k] = (lr[i][j][k - 1] + mul(pows[1 << (k - 1)], lr[nxt][j][k - 1])) % M;
            }
        }

        if (i >= n) { continue; }

        for (int j = 0; j < m; j++) {
            int diff = 0;
            for (int k = LG - 1; k >= 0; k--) {
                if (diff + (1 << k) > n) { continue; }
                if (lr[row + diff][col][k] == lr[i + diff][j][k]) {
                    diff += (1 << k);
                }
            }

            if (diff == n) {
                continue;
            }

            int diff2 = 0;
            for (int k = LG - 1; k >= 0; k--) {
                if (diff2 + (1 << k) > m) { continue; }
                if (lc[row + diff][col + diff2][k] == lc[i + diff][j + diff2][k]) {
                    diff2 += (1 << k);
                }
            }

            if (grid[i + diff][j + diff2] < grid[row + diff][col + diff2]) {
                row = i, col = j;
            }
        }
    }

    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            cout << "*."[grid[row + i][col + j]];
        }
        cout << "\n";
    }
}

• Subtask 1: 10 / 10
• Subtask 2: 40 / 40
• Subtask 3: 0 / 60