oj.uz

Submission #140507

# Submission time Handle Problem Language Result Execution time Memory
140507 2019-08-03T09:11:57 Z wasyl Snake Escaping (JOI18_snake_escaping) C++11
58 / 100
 2000 ms 20120 KB 
#include <bits/stdc++.h>
using namespace std;

constexpr int lax = 20, qax = 1e6, nax = (1 << lax);

int l, q, n, tab[nax], pre[3][nax];
string s;
vector< int > ind;

int id(const char c)
{
    if (c == '?') return 2;
    return c - '0';
}

int rek(const int t, string& s, const int v)
{
    for (int j = v; j < ind.size(); ++j)
    {
        int i = ind[j];
        if (id(s[i]) == t)
        {
            int res = 0;
            if (t == 2)
            {
                s[i] = '0';
                res += rek(t, s, j + 1);
                s[i] = '1';
                res += rek(t, s, j + 1);
                s[i] = '?';
                return res;
            }
            if (t == 0)
            {
                s[i] = '?';
                res += rek(t, s, j + 1);
                s[i] = '1';
                res -= rek(t, s, j + 1);
                s[i] = '0';
                return res;
            }
            if (t == 1)
            {
                s[i] = '?';
                res += rek(t, s, j + 1);
                s[i] = '0';
                res -= rek(t, s, j + 1);
                s[i] = '1';
                return res;
            }

        }
    }
    int msk = 0;
    for (int i = 0; i < l; ++i)
    {
        if (s[i] == '0') continue;
        if (s[i] == '1' and t == 2)
            msk += (1 << i);
        if (s[i] == '?')
            msk += (1 << i);
    }
    //cerr << s << ' ' << msk << ' ' << pre[t][msk] << '\n';
    return pre[t][msk]; //spo
}

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    cin >> l >> q;
    n = (1 << l);

    cin >> s;

    for (int i = 0; i < n; ++i)
        tab[i] = s[i] - '0';

    for (int i = 0; i < n; ++i)
        pre[0][i] = tab[(n - 1) - i];
    for (int i = 0; i < n; ++i)
        pre[1][i] = tab[i];
    for (int i = 0; i < n; ++i)
        pre[2][i] = tab[i];

    for (int i = 0; i < l; ++i)
        for (int j = 0; j < n; ++j)
            if ((1 << i) & j)
                pre[0][j] += pre[0][j - (1 << i)],
                pre[1][j] += pre[1][j - (1 << i)];

                for (int i = 0; i < q; ++i)
                {
                    string s; cin >> s;
                    reverse(begin(s), end(s));
                    int zl[2] = {0, 0};
                    for (char c : s)
                        if (c == '0' or c == '1')
                            ++zl[c - '0'];
                    if (zl[0] <= lax / 3)
                    {
                        ind.clear();
                        for (int i = 0; i < l; ++i)
                            if (s[i] == '0')
                                ind.push_back(i);
                        cout << rek(0, s, 0) << '\n';
                    }
                    else if (zl[1] <= lax / 3)
                    {
                        ind.clear();
                        for (int i = 0; i < l; ++i)
                            if (s[i] == '1')
                                ind.push_back(i);
                        cout << rek(1, s, 0) << '\n';
                    }
                    else if (l - zl[0] - zl[1] <= lax / 3)
                    {
                        ind.clear();
                        for (int i = 0; i < l; ++i)
                            if (s[i] == '?')
                                ind.push_back(i);
                        cout << rek(2, s, 0) << '\n';
                    }
                }
}

Compilation message

snake_escaping.cpp: In function 'int rek(int, std::__cxx11::string&, int)':
snake_escaping.cpp:18:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int j = v; j < ind.size(); ++j)
                     ~~^~~~~~~~~~~~
snake_escaping.cpp: In function 'int main()':
snake_escaping.cpp:89:13: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
             if ((1 << i) & j)
             ^~
snake_escaping.cpp:93:17: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
                 for (int i = 0; i < q; ++i)
                 ^~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 4 ms 376 KB Output is correct
3 Correct 5 ms 376 KB Output is correct
4 Correct 4 ms 376 KB Output is correct
5 Correct 3 ms 376 KB Output is correct
6 Correct 3 ms 376 KB Output is correct
7 Correct 4 ms 376 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 4 ms 380 KB Output is correct
10 Correct 3 ms 376 KB Output is correct

Subtask #2
0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 4 ms 376 KB Output is correct
3 Correct 5 ms 376 KB Output is correct
4 Correct 4 ms 376 KB Output is correct
5 Correct 3 ms 376 KB Output is correct
6 Correct 3 ms 376 KB Output is correct
7 Correct 4 ms 376 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 4 ms 380 KB Output is correct
10 Correct 3 ms 376 KB Output is correct
11 Correct 313 ms 4836 KB Output is correct
12 Correct 1850 ms 4600 KB Output is correct
13 Execution timed out 2070 ms 10204 KB Time limit exceeded
14 Halted 0 ms 0 KB -

Subtask #3
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 4 ms 376 KB Output is correct
3 Correct 5 ms 376 KB Output is correct
4 Correct 4 ms 376 KB Output is correct
5 Correct 3 ms 376 KB Output is correct
6 Correct 3 ms 376 KB Output is correct
7 Correct 4 ms 376 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 4 ms 380 KB Output is correct
10 Correct 3 ms 376 KB Output is correct
11 Correct 313 ms 4836 KB Output is correct
12 Correct 1850 ms 4600 KB Output is correct
13 Execution timed out 2070 ms 10204 KB Time limit exceeded
14 Halted 0 ms 0 KB -

Subtask #4
53.0 / 53.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 4 ms 376 KB Output is correct
3 Correct 5 ms 376 KB Output is correct
4 Correct 4 ms 376 KB Output is correct
5 Correct 3 ms 376 KB Output is correct
6 Correct 3 ms 376 KB Output is correct
7 Correct 4 ms 376 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 4 ms 380 KB Output is correct
10 Correct 3 ms 376 KB Output is correct
11 Correct 82 ms 19580 KB Output is correct
12 Correct 96 ms 19580 KB Output is correct
13 Correct 236 ms 19656 KB Output is correct
14 Correct 464 ms 19608 KB Output is correct
15 Correct 169 ms 19820 KB Output is correct
16 Correct 526 ms 19616 KB Output is correct
17 Correct 340 ms 19608 KB Output is correct
18 Correct 68 ms 19736 KB Output is correct
19 Correct 79 ms 19440 KB Output is correct
20 Correct 82 ms 19608 KB Output is correct
21 Correct 263 ms 19608 KB Output is correct
22 Correct 551 ms 19608 KB Output is correct
23 Correct 166 ms 19480 KB Output is correct
24 Correct 509 ms 19568 KB Output is correct
25 Correct 346 ms 19484 KB Output is correct
26 Correct 70 ms 19480 KB Output is correct
27 Correct 86 ms 19600 KB Output is correct
28 Correct 104 ms 19536 KB Output is correct
29 Correct 263 ms 19764 KB Output is correct
30 Correct 459 ms 19564 KB Output is correct
31 Correct 153 ms 19480 KB Output is correct
32 Correct 457 ms 19612 KB Output is correct
33 Correct 345 ms 19624 KB Output is correct
34 Correct 70 ms 19864 KB Output is correct
35 Correct 264 ms 20120 KB Output is correct
36 Correct 271 ms 19864 KB Output is correct
37 Correct 270 ms 20000 KB Output is correct
38 Correct 267 ms 19888 KB Output is correct
39 Correct 268 ms 19996 KB Output is correct
40 Correct 268 ms 19868 KB Output is correct

Subtask #5
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 4 ms 376 KB Output is correct
3 Correct 5 ms 376 KB Output is correct
4 Correct 4 ms 376 KB Output is correct
5 Correct 3 ms 376 KB Output is correct
6 Correct 3 ms 376 KB Output is correct
7 Correct 4 ms 376 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 4 ms 380 KB Output is correct
10 Correct 3 ms 376 KB Output is correct
11 Correct 313 ms 4836 KB Output is correct
12 Correct 1850 ms 4600 KB Output is correct
13 Execution timed out 2070 ms 10204 KB Time limit exceeded
14 Halted 0 ms 0 KB -