oj.uz

Submission #792623

# Submission time Handle Problem Language Result Execution time Memory
792623 2023-07-25T07:32:37 Z vjudge1 Lamps (JOI19_lamps) C++17
4 / 100
 30 ms 67140 KB 
#ifdef Home
#define _GLIBCXX_DEBUG
#endif // Home

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef long double ld;

const int N = 2022;

string a, b;
int dp[N][N][4];

// 0 don't touched
// 1 turn off all
// 2 turn on  all
// 3 toggle   all

int change(int pr, int cr) {
    return cr == 3 ? 3 - pr : (cr ? cr : pr);
}

int recur(int l, int r, int sts) {
    int &ans = dp[l][r][sts];
    if(ans != -1) {
        return ans;
    }
    if(l + 1 == r) {
        if(sts == 0) {
            return ans = (a[l] != b[l]);
        } 
        if(sts == 1) {
            return ans = ('0' != b[l]);
        } 
        if(sts == 2) {
            return ans = ('1' != b[l]);
        }
        return ans = (a[l] == b[l]);
    }
    ans = r - l;
    for(int m = l + 1; m < r; ++ m) {
        int ansl = recur(l, m, sts);
        for(int nwsts = 1; nwsts < 4; ++ nwsts) {
            ansl = min(ansl, recur(l, m, change(sts, nwsts)) + 1);
        }
        int ansr = recur(m, r, sts);
        for(int nwsts = 1; nwsts < 4; ++ nwsts) {
            ansr = min(ansr, recur(m, r, change(sts, nwsts)) + 1);
        }
        ans = min(ans, ansl + ansr);
    }
    return ans;
}

main() {
#ifdef Home
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif // Home
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    memset(dp, -1, sizeof dp);
    
    int n;
    cin >> n >> a >> b;
    bool ok = a[0] == '0';
    int ans = a[0] != b[0];
    for(int i = 1; i < a.size(); ++ i) {
        ok &= a[i] == '0';
        ans += (b[i] == '1' && b[i - 1] == '0'); 
    }
    if(ok) {
        cout << ans;
        return 0;
    }
    cout << min( {
    recur(0, n, 0),
    recur(0, n, 1) + 1,
    recur(0, n, 2) + 1,
    recur(0, n, 3) + 1} );
}

Compilation message

lamp.cpp:58:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   58 | main() {
      | ^~~~
lamp.cpp: In function 'int main()':
lamp.cpp:72:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   72 |     for(int i = 1; i < a.size(); ++ i) {
      |                    ~~^~~~~~~~~~

Subtask #1
0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 20 ms 64212 KB Output is correct
2 Correct 27 ms 64296 KB Output is correct
3 Correct 28 ms 64328 KB Output is correct
4 Correct 21 ms 64296 KB Output is correct
5 Correct 21 ms 64272 KB Output is correct
6 Correct 21 ms 64296 KB Output is correct
7 Correct 21 ms 64252 KB Output is correct
8 Correct 22 ms 64284 KB Output is correct
9 Correct 23 ms 64204 KB Output is correct
10 Correct 22 ms 64236 KB Output is correct
11 Correct 21 ms 64276 KB Output is correct
12 Correct 22 ms 64244 KB Output is correct
13 Correct 25 ms 64216 KB Output is correct
14 Correct 25 ms 64252 KB Output is correct
15 Correct 25 ms 64276 KB Output is correct
16 Correct 26 ms 64212 KB Output is correct
17 Correct 25 ms 64256 KB Output is correct
18 Correct 25 ms 64316 KB Output is correct
19 Correct 25 ms 64224 KB Output is correct
20 Correct 25 ms 64304 KB Output is correct
21 Correct 24 ms 64212 KB Output is correct
22 Correct 25 ms 64212 KB Output is correct
23 Correct 24 ms 64220 KB Output is correct
24 Correct 29 ms 64284 KB Output is correct
25 Correct 30 ms 64316 KB Output is correct
26 Incorrect 28 ms 64216 KB Output isn't correct
27 Halted 0 ms 0 KB -

Subtask #2
0 / 41.0

# Verdict Execution time Memory Grader output
1 Correct 20 ms 64212 KB Output is correct
2 Correct 27 ms 64296 KB Output is correct
3 Correct 28 ms 64328 KB Output is correct
4 Correct 21 ms 64296 KB Output is correct
5 Correct 21 ms 64272 KB Output is correct
6 Correct 21 ms 64296 KB Output is correct
7 Correct 21 ms 64252 KB Output is correct
8 Correct 22 ms 64284 KB Output is correct
9 Correct 23 ms 64204 KB Output is correct
10 Correct 22 ms 64236 KB Output is correct
11 Correct 21 ms 64276 KB Output is correct
12 Correct 22 ms 64244 KB Output is correct
13 Correct 25 ms 64216 KB Output is correct
14 Correct 25 ms 64252 KB Output is correct
15 Correct 25 ms 64276 KB Output is correct
16 Correct 26 ms 64212 KB Output is correct
17 Correct 25 ms 64256 KB Output is correct
18 Correct 25 ms 64316 KB Output is correct
19 Correct 25 ms 64224 KB Output is correct
20 Correct 25 ms 64304 KB Output is correct
21 Correct 24 ms 64212 KB Output is correct
22 Correct 25 ms 64212 KB Output is correct
23 Correct 24 ms 64220 KB Output is correct
24 Correct 29 ms 64284 KB Output is correct
25 Correct 30 ms 64316 KB Output is correct
26 Incorrect 28 ms 64216 KB Output isn't correct
27 Halted 0 ms 0 KB -

Subtask #3
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 26 ms 64212 KB Output is correct
2 Correct 24 ms 64212 KB Output is correct
3 Correct 23 ms 64244 KB Output is correct
4 Correct 24 ms 64304 KB Output is correct
5 Correct 24 ms 64332 KB Output is correct
6 Correct 24 ms 64212 KB Output is correct
7 Correct 30 ms 66924 KB Output is correct
8 Correct 30 ms 66920 KB Output is correct
9 Correct 29 ms 67016 KB Output is correct
10 Correct 29 ms 66996 KB Output is correct
11 Correct 30 ms 66924 KB Output is correct
12 Correct 29 ms 67048 KB Output is correct
13 Correct 28 ms 67012 KB Output is correct
14 Correct 29 ms 67140 KB Output is correct

Subtask #4
0 / 49.0

# Verdict Execution time Memory Grader output
1 Correct 20 ms 64212 KB Output is correct
2 Correct 27 ms 64296 KB Output is correct
3 Correct 28 ms 64328 KB Output is correct
4 Correct 21 ms 64296 KB Output is correct
5 Correct 21 ms 64272 KB Output is correct
6 Correct 21 ms 64296 KB Output is correct
7 Correct 21 ms 64252 KB Output is correct
8 Correct 22 ms 64284 KB Output is correct
9 Correct 23 ms 64204 KB Output is correct
10 Correct 22 ms 64236 KB Output is correct
11 Correct 21 ms 64276 KB Output is correct
12 Correct 22 ms 64244 KB Output is correct
13 Correct 25 ms 64216 KB Output is correct
14 Correct 25 ms 64252 KB Output is correct
15 Correct 25 ms 64276 KB Output is correct
16 Correct 26 ms 64212 KB Output is correct
17 Correct 25 ms 64256 KB Output is correct
18 Correct 25 ms 64316 KB Output is correct
19 Correct 25 ms 64224 KB Output is correct
20 Correct 25 ms 64304 KB Output is correct
21 Correct 24 ms 64212 KB Output is correct
22 Correct 25 ms 64212 KB Output is correct
23 Correct 24 ms 64220 KB Output is correct
24 Correct 29 ms 64284 KB Output is correct
25 Correct 30 ms 64316 KB Output is correct
26 Incorrect 28 ms 64216 KB Output isn't correct
27 Halted 0 ms 0 KB -