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Submission #377592

# Submission time Handle Problem Language Result Execution time Memory
377592 2021-03-14T10:52:13 Z NONAME Sateliti (COCI20_satellti) C++17
110 / 110
 759 ms 49516 KB 
#include <bits/stdc++.h>
using namespace std;
mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());

const int man = (int)(1e3 + 10);
const int base = (int)(1e9 + 7);

int n, m;
int pw[man + man][man + man];
int a[man + man][man + man], pf[man + man][man + man];

int sum(int x, int y) {
    x += y;
    if (x >= base) {
        x -= base;
    }
    if (x < 0) {
        x += base;
    }
    return x;
}

int mul(int x, int y) {
    return (x * 1LL * y) % base;
}

int bp(int x, int y) {
    int ret = 1;
    while (y) {
        if (y & 1) {
            ret = mul(ret, x);
        }
        x = mul(x, x);
        y >>= 1;
    }
    return ret;
}

int get(int x, int y, int X, int Y, int lx, int ly) {
    int hsh = sum(pf[X][Y], -pf[x - 1][Y]);
    hsh = sum(hsh, -pf[X][y - 1]);
    hsh = sum(hsh, pf[x - 1][y - 1]);
    hsh = mul(hsh, pw[lx][ly]);
    // cerr << hsh << "\n";
    return hsh;
}

void check(int x, int y, int& pi, int& pj) {
    get(x, y, x, y + 1, pi - 1, pj - 1);
    get(pi, pj, pi, pj + 1, x - 1, y - 1);

    int l = 1, r = n;
    while (l < r) {
        int md = (l + r) >> 1;
        if (get(x, y, x + md - 1, y + m - 1, pi - 1, pj - 1) != get(pi, pj, pi + md - 1, pj + m - 1, x - 1, y - 1)) {
            r = md;
        } else {
            l = md + 1;
        }
    }

    int len = l;
    // cerr << len << "\n";

    l = 1; r = m;

    // cerr << get(x, x, y, y) << " " << get(pi, pi, pj, pj) << "\n";

    while (l < r) {
        int md = (l + r) >> 1;
        // cerr << md << " " << get(x + len - 1, x + len - 1, y, y + md - 1) << " " << get(pi + len - 1, pi + len - 1, pj, pj + md - 1) << "\n";
        if (get(x + len - 1, y, x + len - 1, y + md - 1, pi + len - 2, pj - 1) != get(pi + len - 1, pj, pi + len - 1, pj + md - 1, x + len - 2, y - 1)) {
            r = md;
        } else {
            l = md + 1;
        }
    }
    // cerr << l << "\n";

    // cerr << x << " " << y << " " << len << " " << l << "\n";
    // cerr << a[x + len - 1][y + l - 1] << " " << a[pi + len - 1][pj + l - 1] << "\n";
    if (a[x + len - 1][y + l - 1] < a[pi + len - 1][pj + l - 1]) {
        pi = x;
        pj = y;
    }
}

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

    cin >> n >> m;
    for (int i = 1; i <= n; ++i) {
        for (int j = 1; j <= m; ++j) {
            char c;
            cin >> c;
            if (c == '*') {
                a[i][j] = 0;
            } else {
                a[i][j] = 1;
            }
            a[i + n][j] = a[i][j + m] = a[i + n][j + m] = a[i][j];
        }
    }

    // for (int i = 1; i <= (n + n); ++i, cerr << "\n") {
    //     for (int j = 1; j <= (m + m); ++j) {
    //         cerr << a[i][j];
    //     }
    // }

    pw[0][0] = 1;
    for (int i = 0; i < (n + n); ++i) {
        for (int j = 0; j < (m + m); ++j) {
            if ((i == 0) && (j == 0)) {
                continue;
            }
            if (i == 0) {
                pw[i][j] = mul(pw[i][j - 1], 5);
            } else {
                pw[i][j] = mul(pw[i - 1][j], 7);
            }
        }
    }

    for (int i = 1; i <= (n + n); ++i) {
        for (int j = 1; j <= (m + m); ++j) {
            int hsh = mul(a[i][j] + 1, pw[i - 1][j - 1]);
            pf[i][j] = sum(sum(pf[i][j - 1], sum(pf[i - 1][j], -pf[i - 1][j - 1])), hsh);
        }
    }

    int pi = 1, pj = 1;
    for (int i = 1; i <= n; ++i) {
        for (int j = 1; j <= m; ++j) {
            // if ((i == 2) && (j == 2)) {
            //     cerr << pi << " " << pj << "\n";
            // }
            check(i, j, pi, pj);
        }
    }

    // pi = 1; pj = 2;
    // cerr << pi << " " << pj << "\n";
    // check(2, 2, pi, pj);


    for (int i = pi; i <= (pi + n - 1); ++i, cout << "\n") {
        for (int j = pj; j <= (pj + m - 1); ++j) {
            cout << (a[i][j] ? '.' : '*');
        }
    }

    return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 1644 KB Output is correct
2 Correct 2 ms 1516 KB Output is correct
3 Correct 2 ms 1516 KB Output is correct
4 Correct 2 ms 1516 KB Output is correct
5 Correct 2 ms 1644 KB Output is correct
6 Correct 2 ms 1644 KB Output is correct
7 Correct 2 ms 1644 KB Output is correct

Subtask #2
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 1644 KB Output is correct
2 Correct 2 ms 1516 KB Output is correct
3 Correct 2 ms 1516 KB Output is correct
4 Correct 2 ms 1516 KB Output is correct
5 Correct 2 ms 1644 KB Output is correct
6 Correct 2 ms 1644 KB Output is correct
7 Correct 2 ms 1644 KB Output is correct
8 Correct 53 ms 11500 KB Output is correct
9 Correct 2 ms 748 KB Output is correct
10 Correct 5 ms 7532 KB Output is correct
11 Correct 54 ms 11500 KB Output is correct
12 Correct 57 ms 11712 KB Output is correct
13 Correct 61 ms 11904 KB Output is correct
14 Correct 59 ms 11884 KB Output is correct
15 Correct 56 ms 11884 KB Output is correct
16 Correct 59 ms 11884 KB Output is correct
17 Correct 59 ms 11884 KB Output is correct

Subtask #3
60.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 1644 KB Output is correct
2 Correct 2 ms 1516 KB Output is correct
3 Correct 2 ms 1516 KB Output is correct
4 Correct 2 ms 1516 KB Output is correct
5 Correct 2 ms 1644 KB Output is correct
6 Correct 2 ms 1644 KB Output is correct
7 Correct 2 ms 1644 KB Output is correct
8 Correct 53 ms 11500 KB Output is correct
9 Correct 2 ms 748 KB Output is correct
10 Correct 5 ms 7532 KB Output is correct
11 Correct 54 ms 11500 KB Output is correct
12 Correct 57 ms 11712 KB Output is correct
13 Correct 61 ms 11904 KB Output is correct
14 Correct 59 ms 11884 KB Output is correct
15 Correct 56 ms 11884 KB Output is correct
16 Correct 59 ms 11884 KB Output is correct
17 Correct 59 ms 11884 KB Output is correct
18 Correct 618 ms 48704 KB Output is correct
19 Correct 20 ms 24940 KB Output is correct
20 Correct 14 ms 1260 KB Output is correct
21 Correct 619 ms 49388 KB Output is correct
22 Correct 702 ms 49492 KB Output is correct
23 Correct 648 ms 49516 KB Output is correct
24 Correct 687 ms 49516 KB Output is correct
25 Correct 619 ms 49388 KB Output is correct
26 Correct 671 ms 49392 KB Output is correct
27 Correct 759 ms 49388 KB Output is correct