oj.uz

Submission #823103

# Submission time Handle Problem Language Result Execution time Memory
823103 2023-08-12T08:07:21 Z TheOpChicken Lamps (JOI19_lamps) C++17
4 / 100
 193 ms 67064 KB 
#include <bits/stdc++.h>
using namespace std;

/*
0 = nothing. 
1 = toggle
2 = set 0s
3 = set 1s
0: 0 0 0
1: 0 0 1
2: 0 0 2
3: 0 0 3
4: 0 1 2
5: 0 1 3
6: 0 2 1
7: 0 2 3
8: 0 3 1
9: 0 3 2
10: 1 2 3
11: 1 3 2
12: 2 1 3
13: 2 3 1
14: 3 1 2
15: 3 2 1
*/


const int maxN = 1e6 + 5, inf = 1e9;
int dp[maxN][16];

bool res[16][2] = {{0, 1}, {1, 0}, {1, 1}, {0, 0}, {0, 0}, {1, 1}, {1, 1}, {1, 1}, {0, 0}, {0, 0}, {1, 1}, {0, 0}, {1, 1}, {0, 0}, {0, 0}, {1, 1}};

vector<vector<int> > ops = {{}, {1}, {2}, {3}, {1, 2}, {1, 3}, {2, 1}, {2, 3}, {3, 1}, {3, 2}, {1, 2, 3}, {1, 3, 2}, {2, 1, 3}, {2, 3, 1}, {3, 1, 2}, {3, 2, 1}};

int ops_needed[16][16];

int lcs(vector<int> X, vector<int> Y)
{
    int m = X.size();
    int n = Y.size();
    int L[m + 1][n + 1];
 
    for (int i = 0; i <= m; i++) {
        for (int j = 0; j <= n; j++) {
            if (i == 0 || j == 0)
                L[i][j] = 0;
 
            else if (X[i - 1] == Y[j - 1])
                L[i][j] = L[i - 1][j - 1] + 1;
 
            else
                L[i][j] = max(L[i - 1][j], L[i][j - 1]);
        }
    }

    return L[m][n];
}

int main(){
	for (int i = 0; i < 16; i++){
		for (int j = 0; j < 16; j++){
			ops_needed[i][j] = ops[j].size() - lcs(ops[i], ops[j]);
		}
	}

	int n;
	cin >> n;

	string a, b;
	cin >> a >> b;

	dp[0][0] = 0;
	for (int i = 1; i < 16; i++) dp[0][i] = inf;

	for (int i = 1; i <= n; i++){
		bool a_bit = a[i-1] - '0', b_bit = b[i-1] - '0';
		for (int j = 0; j < 16; j++){
			dp[i][j] = inf;
			if (res[a_bit][j] != b_bit) continue;
			for (int k = 0; k < 16; k++) dp[i][j] = min(dp[i][j], dp[i-1][k] + ops_needed[k][j]);
		}
	}

	int ans = inf;
	for (int i = 0; i < 16; i++) ans = min(ans, dp[n][i]);

	cout << ans << endl;
}

Compilation message

lamp.cpp: In function 'int main()':
lamp.cpp:79:20: warning: iteration 2 invokes undefined behavior [-Waggressive-loop-optimizations]
   79 |    if (res[a_bit][j] != b_bit) continue;
      |        ~~~~~~~~~~~~^
lamp.cpp:77:21: note: within this loop
   77 |   for (int j = 0; j < 16; j++){
      |                   ~~^~~~

Subtask #1
0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 1 ms 308 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 0 ms 316 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 1 ms 312 KB Output is correct
13 Incorrect 0 ms 212 KB Output isn't correct
14 Halted 0 ms 0 KB -

Subtask #2
0 / 41.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 1 ms 308 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 0 ms 316 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 1 ms 312 KB Output is correct
13 Incorrect 0 ms 212 KB Output isn't correct
14 Halted 0 ms 0 KB -

Subtask #3
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 139 ms 66960 KB Output is correct
8 Correct 175 ms 66920 KB Output is correct
9 Correct 164 ms 67064 KB Output is correct
10 Correct 167 ms 66880 KB Output is correct
11 Correct 168 ms 66960 KB Output is correct
12 Correct 193 ms 67024 KB Output is correct
13 Correct 172 ms 66912 KB Output is correct
14 Correct 160 ms 66964 KB Output is correct

Subtask #4
0 / 49.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 1 ms 308 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 0 ms 316 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 1 ms 312 KB Output is correct
13 Incorrect 0 ms 212 KB Output isn't correct
14 Halted 0 ms 0 KB -