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Submission #105866

# Submission time Handle Problem Language Result Execution time Memory
105866 2019-04-15T11:24:00 Z Alexa2001 Lamps (JOI19_lamps) C++17
6 / 100
 1000 ms 22516 KB 
#include <bits/stdc++.h>

using namespace std;

const int Nmax = 1e6 + 5;

int a[Nmax], b[Nmax], a0[Nmax], b0[Nmax], ones[Nmax], dp[Nmax][2];
int i, j, n;

int nr_ones(int x, int y)
{
    return ones[y] - ones[x-1];
}

int main()
{
 //   freopen("input", "r", stdin);
    cin.sync_with_stdio(false);

    cin >> n;
    string A, B;
    cin >> A >> B;

    for(i=1; i<=n; ++i)
        a0[i] = A[i-1] - '0', b0[i] = B[i-1] - '0';

    for(i=1; i<=n+1; ++i)
        a[i] = a0[i-1] ^ a0[i], b[i] = b0[i-1] ^ b0[i];

    for(i=1; i<=n+1; ++i) ones[i] = ones[i-1] + b[i];

    for(i=1; i<=n+1; ++i)
    {
        dp[i][0] = min(dp[i-1][0], dp[i-1][1]) + (a[i] ^ b[i]);
        dp[i][1] = 1e9;

        for(j=1; j<i; ++j) /// flip cu schimbare j...i
        {
            dp[i][1] = min(dp[i][1],
                           2 + dp[j][0] + (a[i] ^ b[i] ^ 1) - (a[j] ^ b[j]) + (a[j] ^ b[j] ^ 1) + nr_ones(j+1, i-1)
                           );

            dp[i][1] = min(dp[i][1],
                           2 + dp[j][1] + (a[i] ^ b[i] ^ 1) -(a[j] ^ b[j] ^ 1) + (a[j] ^ b[j]) + nr_ones(j+1, i-1)
                           );
        }
    }

    cout << (min(dp[n+1][0], dp[n+1][1]) + 1)/2 << '\n';
    return 0;
}

Subtask #1
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 384 KB Output is correct
2 Correct 3 ms 384 KB Output is correct
3 Correct 2 ms 384 KB Output is correct
4 Correct 2 ms 384 KB Output is correct
5 Correct 3 ms 384 KB Output is correct
6 Correct 3 ms 384 KB Output is correct
7 Correct 2 ms 384 KB Output is correct
8 Correct 2 ms 384 KB Output is correct
9 Correct 3 ms 384 KB Output is correct
10 Correct 3 ms 384 KB Output is correct
11 Correct 2 ms 384 KB Output is correct
12 Correct 2 ms 384 KB Output is correct
13 Correct 2 ms 384 KB Output is correct
14 Correct 2 ms 384 KB Output is correct
15 Correct 2 ms 384 KB Output is correct
16 Correct 2 ms 384 KB Output is correct
17 Correct 2 ms 384 KB Output is correct
18 Correct 2 ms 384 KB Output is correct
19 Correct 2 ms 384 KB Output is correct
20 Correct 2 ms 384 KB Output is correct
21 Correct 2 ms 384 KB Output is correct
22 Correct 2 ms 384 KB Output is correct
23 Correct 2 ms 384 KB Output is correct
24 Correct 2 ms 384 KB Output is correct
25 Correct 2 ms 384 KB Output is correct
26 Correct 3 ms 384 KB Output is correct
27 Correct 2 ms 384 KB Output is correct
28 Correct 3 ms 384 KB Output is correct
29 Correct 3 ms 384 KB Output is correct
30 Correct 2 ms 356 KB Output is correct
31 Correct 3 ms 384 KB Output is correct
32 Correct 3 ms 384 KB Output is correct
33 Correct 2 ms 384 KB Output is correct
34 Correct 2 ms 384 KB Output is correct

Subtask #2
0 / 41.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 384 KB Output is correct
2 Correct 3 ms 384 KB Output is correct
3 Correct 2 ms 384 KB Output is correct
4 Correct 2 ms 384 KB Output is correct
5 Correct 3 ms 384 KB Output is correct
6 Correct 3 ms 384 KB Output is correct
7 Correct 2 ms 384 KB Output is correct
8 Correct 2 ms 384 KB Output is correct
9 Correct 3 ms 384 KB Output is correct
10 Correct 3 ms 384 KB Output is correct
11 Correct 2 ms 384 KB Output is correct
12 Correct 2 ms 384 KB Output is correct
13 Correct 2 ms 384 KB Output is correct
14 Correct 2 ms 384 KB Output is correct
15 Correct 2 ms 384 KB Output is correct
16 Correct 2 ms 384 KB Output is correct
17 Correct 2 ms 384 KB Output is correct
18 Correct 2 ms 384 KB Output is correct
19 Correct 2 ms 384 KB Output is correct
20 Correct 2 ms 384 KB Output is correct
21 Correct 2 ms 384 KB Output is correct
22 Correct 2 ms 384 KB Output is correct
23 Correct 2 ms 384 KB Output is correct
24 Correct 2 ms 384 KB Output is correct
25 Correct 2 ms 384 KB Output is correct
26 Correct 3 ms 384 KB Output is correct
27 Correct 2 ms 384 KB Output is correct
28 Correct 3 ms 384 KB Output is correct
29 Correct 3 ms 384 KB Output is correct
30 Correct 2 ms 356 KB Output is correct
31 Correct 3 ms 384 KB Output is correct
32 Correct 3 ms 384 KB Output is correct
33 Correct 2 ms 384 KB Output is correct
34 Correct 2 ms 384 KB Output is correct
35 Correct 10 ms 384 KB Output is correct
36 Correct 11 ms 512 KB Output is correct
37 Correct 8 ms 384 KB Output is correct
38 Correct 8 ms 512 KB Output is correct
39 Correct 11 ms 512 KB Output is correct
40 Correct 10 ms 384 KB Output is correct
41 Correct 10 ms 384 KB Output is correct
42 Correct 9 ms 512 KB Output is correct
43 Incorrect 8 ms 384 KB Output isn't correct
44 Halted 0 ms 0 KB -

Subtask #3
0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 384 KB Output is correct
2 Correct 3 ms 384 KB Output is correct
3 Correct 2 ms 384 KB Output is correct
4 Correct 3 ms 384 KB Output is correct
5 Correct 2 ms 384 KB Output is correct
6 Correct 2 ms 384 KB Output is correct
7 Execution timed out 1077 ms 22516 KB Time limit exceeded
8 Halted 0 ms 0 KB -

Subtask #4
0 / 49.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 384 KB Output is correct
2 Correct 3 ms 384 KB Output is correct
3 Correct 2 ms 384 KB Output is correct
4 Correct 2 ms 384 KB Output is correct
5 Correct 3 ms 384 KB Output is correct
6 Correct 3 ms 384 KB Output is correct
7 Correct 2 ms 384 KB Output is correct
8 Correct 2 ms 384 KB Output is correct
9 Correct 3 ms 384 KB Output is correct
10 Correct 3 ms 384 KB Output is correct
11 Correct 2 ms 384 KB Output is correct
12 Correct 2 ms 384 KB Output is correct
13 Correct 2 ms 384 KB Output is correct
14 Correct 2 ms 384 KB Output is correct
15 Correct 2 ms 384 KB Output is correct
16 Correct 2 ms 384 KB Output is correct
17 Correct 2 ms 384 KB Output is correct
18 Correct 2 ms 384 KB Output is correct
19 Correct 2 ms 384 KB Output is correct
20 Correct 2 ms 384 KB Output is correct
21 Correct 2 ms 384 KB Output is correct
22 Correct 2 ms 384 KB Output is correct
23 Correct 2 ms 384 KB Output is correct
24 Correct 2 ms 384 KB Output is correct
25 Correct 2 ms 384 KB Output is correct
26 Correct 3 ms 384 KB Output is correct
27 Correct 2 ms 384 KB Output is correct
28 Correct 3 ms 384 KB Output is correct
29 Correct 3 ms 384 KB Output is correct
30 Correct 2 ms 356 KB Output is correct
31 Correct 3 ms 384 KB Output is correct
32 Correct 3 ms 384 KB Output is correct
33 Correct 2 ms 384 KB Output is correct
34 Correct 2 ms 384 KB Output is correct
35 Correct 10 ms 384 KB Output is correct
36 Correct 11 ms 512 KB Output is correct
37 Correct 8 ms 384 KB Output is correct
38 Correct 8 ms 512 KB Output is correct
39 Correct 11 ms 512 KB Output is correct
40 Correct 10 ms 384 KB Output is correct
41 Correct 10 ms 384 KB Output is correct
42 Correct 9 ms 512 KB Output is correct
43 Incorrect 8 ms 384 KB Output isn't correct
44 Halted 0 ms 0 KB -