oj.uz

Submission #584042

# Submission time Handle Problem Language Result Execution time Memory
584042 2022-06-26T17:04:09 Z cheissmart Flight to the Ford (BOI22_communication) C++17
30 / 100
 5776 ms 2040 KB 
#include"communication.h"
#include <bits/stdc++.h>
#define IO_OP ios::sync_with_stdio(0), cin.tie(0)
#define F first
#define S second
#define V vector
#define PB push_back
#define EB emplace_back
#define MP make_pair
#define SZ(v) int((v).size())
#define ALL(v) (v).begin(), (v).end()

using namespace std;

typedef long long ll;
typedef pair<int, int> pi;
typedef V<int> vi;

const int INF = 1e9 + 7;

int aux[] = {0b0000, 0b1001, 0b0110};

int get_bad(int x) {
    vi ans;
    for(int k = 0; k < 3; k++)
        if(x == aux[k])
            ans.PB(k);
    for(int i = 0; i < 4; i++) {
        int y = x ^ (1 << i);
        for(int k = 0; k < 3; k++)
            if(y == aux[k])
                ans.PB(k);
        for(int j = 0; j < i - 1; j++) {
            int z = y ^ (1 << j);
            for(int k = 0; k < 3; k++)
                if(z == aux[k])
                    ans.PB(k);
        }
    }
    for(int i = 0; i < 3; i++)
        if(count(ALL(ans), i) == 0)
            return i;
    throw;
};

void encode(int n, int x) {
    x--;
    auto send_3 = [&] (int y) {
        assert(0 <= y && y < 3);
        int sent = 0;
        for(int i = 0; i < 4; i++)
            sent |= send(aux[y] >> i & 1) << i;

        #ifdef CHEISSMART
        assert(get_bad(sent) != y);
        #endif

        return get_bad(sent);
    };
    function<void(int)> go = [&] (int m) { // [0, m);
        assert(x < m);
        if(m <= 3) {
            send_3(x);
            return;
        }
        int he = m / 3, be = he * 2;
        // [0, he), [he, be), [be, m)
        if(x < he) {
            int bad = send_3(0);
            if(bad == 1) go(he + m - be);
            else if(bad == 2) go(be);
            else throw;
        } else if(x < be) {
            int bad = send_3(1);
            if(bad == 0) {
                x -= he;
                go(m - he);
            } else if(bad == 2) {
                go(be);
            } else throw;
        } else {
            int bad = send_3(2);
            if(bad == 0) {
                x -= he;
                go(m - he);
            } else if(bad == 1) {
                x -= be - he;
                go(he + m - be);
            } else throw;
        }
    };
    go(n);
}

pi decode(int n) {
    auto get_3 = [&] () {
        int x = 0;
        for(int i = 0; i < 4; i++)
            x |= receive() << i;
        return get_bad(x);
    };
    function<pi(int)> go = [&] (int m) -> pi { // [0, m);
        if(m <= 3) {
            int bad = get_3();
            if(bad == 0) return {1, 2};
            else if(bad == 1) return {0, 2};
            else return {0, 1};
        }
        int he = m / 3, be = he * 2;
        // [0, he), [he, be), [be, m)
        int bad = get_3();
        if(bad == 0) {
            auto [x, y] = go(m - he);
            x += he, y += he;
            return {x, y};
        } else if(bad == 1) {
            auto [x, y] = go(he + m - be);
            if(x >= he) x += be - he;
            if(y >= he) y += be - he;
            return {x, y};
        } else {
            auto [x, y] = go(be);
            return {x, y};
        }
    };
    auto[x, y] = go(n);
    return {x + 1, y + 1};
}

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 1728 KB Output is correct
2 Correct 15 ms 1708 KB Output is correct
3 Correct 16 ms 1812 KB Output is correct
4 Correct 10 ms 1748 KB Output is correct
5 Correct 13 ms 1736 KB Output is correct
6 Correct 27 ms 1784 KB Output is correct
7 Correct 38 ms 1668 KB Output is correct

Subtask #2
15.000035 / 85.0

# Verdict Execution time Memory Grader output
1 Partially correct 1274 ms 1876 KB Output is partially correct
2 Partially correct 644 ms 1780 KB Output is partially correct
3 Partially correct 892 ms 1692 KB Output is partially correct
4 Partially correct 1548 ms 1812 KB Output is partially correct
5 Partially correct 1370 ms 1788 KB Output is partially correct
6 Partially correct 1035 ms 1808 KB Output is partially correct
7 Partially correct 3844 ms 1828 KB Output is partially correct
8 Partially correct 5774 ms 2040 KB Output is partially correct
9 Partially correct 4951 ms 1988 KB Output is partially correct
10 Partially correct 5445 ms 1980 KB Output is partially correct
11 Partially correct 5129 ms 1924 KB Output is partially correct
12 Partially correct 5340 ms 1888 KB Output is partially correct
13 Partially correct 5220 ms 1976 KB Output is partially correct
14 Partially correct 4827 ms 1984 KB Output is partially correct
15 Partially correct 2557 ms 1908 KB Output is partially correct
16 Partially correct 5776 ms 1856 KB Output is partially correct
17 Partially correct 1250 ms 1836 KB Output is partially correct
18 Partially correct 1506 ms 1964 KB Output is partially correct
19 Partially correct 1461 ms 1916 KB Output is partially correct
20 Partially correct 1395 ms 1884 KB Output is partially correct
21 Partially correct 1392 ms 1880 KB Output is partially correct
22 Partially correct 1502 ms 1956 KB Output is partially correct
23 Partially correct 2352 ms 1736 KB Output is partially correct
24 Correct 12 ms 1600 KB Output is correct
25 Correct 13 ms 1744 KB Output is correct
26 Correct 16 ms 1636 KB Output is correct
27 Correct 12 ms 1824 KB Output is correct
28 Correct 9 ms 1728 KB Output is correct
29 Correct 25 ms 1812 KB Output is correct
30 Correct 45 ms 1664 KB Output is correct