#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ar array
const int mxN=1e6;
int n, dp[mxN][5]; // use nothing, use 0 parity 1, use 0 parity 0, use 1 parity 1, use 1 parity 0
string a, b;
bool ck(int i, int t) {
char x=t==0?a[i]:t<=2?'0':'1';
return x!=b[i];
}
bool bad(int i, int j, int k) {
return ck(i, j)&&!ck(i-1, k);
}
int main() {
ios::sync_with_stdio(0);
cin.tie(0);
cin >> n >> a >> b;
memset(dp, 0x3f, sizeof(dp));
dp[0][0]=(a[0]!=b[0]);
dp[0][1]=1+(b[0]=='1');
dp[0][3]=1+(b[0]=='0');
for (int i=1; i<n; ++i) {
dp[i][0]=min(dp[i][0], dp[i-1][0]+bad(i, 0, 0));
dp[i][1]=min(dp[i][1], dp[i-1][0]+bad(i, 1, 0)+1);
dp[i][3]=min(dp[i][3], dp[i-1][0]+bad(i, 3, 0)+1);
for (int j=1; j<5; ++j) {
dp[i][j]=min(dp[i][j], dp[i-1][j]+bad(i, j, j));
dp[i][0]=min(dp[i][0], dp[i-1][j]+bad(i, 0, j));
dp[i][5-j]=min(dp[i][5-j], dp[i-1][j]+bad(i, 5-j, j)+(j%2));
}
}
cout << *min_element(dp[n-1], dp[n-1]+5);
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 2 |
Correct |
8 ms |
19784 KB |
Output is correct |
| 3 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 4 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 5 |
Correct |
7 ms |
19784 KB |
Output is correct |
| 6 |
Correct |
9 ms |
19796 KB |
Output is correct |
| 7 |
Correct |
8 ms |
19836 KB |
Output is correct |
| 8 |
Correct |
8 ms |
19780 KB |
Output is correct |
| 9 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 10 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 11 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 12 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 13 |
Correct |
10 ms |
19796 KB |
Output is correct |
| 14 |
Correct |
9 ms |
19796 KB |
Output is correct |
| 15 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 16 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 17 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 18 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 19 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 20 |
Correct |
7 ms |
19892 KB |
Output is correct |
| 21 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 22 |
Correct |
7 ms |
19796 KB |
Output is correct |
| 23 |
Correct |
8 ms |
19792 KB |
Output is correct |
| 24 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 25 |
Correct |
10 ms |
19896 KB |
Output is correct |
| 26 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 27 |
Correct |
8 ms |
19784 KB |
Output is correct |
| 28 |
Correct |
8 ms |
19840 KB |
Output is correct |
| 29 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 30 |
Correct |
9 ms |
19784 KB |
Output is correct |
| 31 |
Correct |
9 ms |
19780 KB |
Output is correct |
| 32 |
Correct |
8 ms |
19872 KB |
Output is correct |
| 33 |
Correct |
8 ms |
19784 KB |
Output is correct |
| 34 |
Correct |
8 ms |
19796 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 2 |
Correct |
8 ms |
19784 KB |
Output is correct |
| 3 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 4 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 5 |
Correct |
7 ms |
19784 KB |
Output is correct |
| 6 |
Correct |
9 ms |
19796 KB |
Output is correct |
| 7 |
Correct |
8 ms |
19836 KB |
Output is correct |
| 8 |
Correct |
8 ms |
19780 KB |
Output is correct |
| 9 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 10 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 11 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 12 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 13 |
Correct |
10 ms |
19796 KB |
Output is correct |
| 14 |
Correct |
9 ms |
19796 KB |
Output is correct |
| 15 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 16 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 17 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 18 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 19 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 20 |
Correct |
7 ms |
19892 KB |
Output is correct |
| 21 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 22 |
Correct |
7 ms |
19796 KB |
Output is correct |
| 23 |
Correct |
8 ms |
19792 KB |
Output is correct |
| 24 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 25 |
Correct |
10 ms |
19896 KB |
Output is correct |
| 26 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 27 |
Correct |
8 ms |
19784 KB |
Output is correct |
| 28 |
Correct |
8 ms |
19840 KB |
Output is correct |
| 29 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 30 |
Correct |
9 ms |
19784 KB |
Output is correct |
| 31 |
Correct |
9 ms |
19780 KB |
Output is correct |
| 32 |
Correct |
8 ms |
19872 KB |
Output is correct |
| 33 |
Correct |
8 ms |
19784 KB |
Output is correct |
| 34 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 35 |
Correct |
7 ms |
19784 KB |
Output is correct |
| 36 |
Correct |
8 ms |
19896 KB |
Output is correct |
| 37 |
Correct |
8 ms |
19788 KB |
Output is correct |
| 38 |
Correct |
8 ms |
19860 KB |
Output is correct |
| 39 |
Correct |
8 ms |
19784 KB |
Output is correct |
| 40 |
Correct |
9 ms |
19796 KB |
Output is correct |
| 41 |
Correct |
8 ms |
19884 KB |
Output is correct |
| 42 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 43 |
Correct |
10 ms |
19808 KB |
Output is correct |
| 44 |
Correct |
8 ms |
19836 KB |
Output is correct |
| 45 |
Correct |
8 ms |
19784 KB |
Output is correct |
| 46 |
Correct |
9 ms |
19796 KB |
Output is correct |
| 47 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 48 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 49 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 50 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 51 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 52 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 53 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 54 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 55 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 56 |
Correct |
7 ms |
19796 KB |
Output is correct |
| 57 |
Correct |
8 ms |
19784 KB |
Output is correct |
| 58 |
Correct |
8 ms |
19792 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
8 ms |
19784 KB |
Output is correct |
| 2 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 3 |
Correct |
7 ms |
19796 KB |
Output is correct |
| 4 |
Correct |
8 ms |
19872 KB |
Output is correct |
| 5 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 6 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 7 |
Correct |
44 ms |
23692 KB |
Output is correct |
| 8 |
Correct |
44 ms |
23616 KB |
Output is correct |
| 9 |
Correct |
47 ms |
23644 KB |
Output is correct |
| 10 |
Correct |
45 ms |
23560 KB |
Output is correct |
| 11 |
Correct |
43 ms |
23644 KB |
Output is correct |
| 12 |
Correct |
43 ms |
23636 KB |
Output is correct |
| 13 |
Correct |
42 ms |
23524 KB |
Output is correct |
| 14 |
Correct |
43 ms |
23532 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 2 |
Correct |
8 ms |
19784 KB |
Output is correct |
| 3 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 4 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 5 |
Correct |
7 ms |
19784 KB |
Output is correct |
| 6 |
Correct |
9 ms |
19796 KB |
Output is correct |
| 7 |
Correct |
8 ms |
19836 KB |
Output is correct |
| 8 |
Correct |
8 ms |
19780 KB |
Output is correct |
| 9 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 10 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 11 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 12 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 13 |
Correct |
10 ms |
19796 KB |
Output is correct |
| 14 |
Correct |
9 ms |
19796 KB |
Output is correct |
| 15 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 16 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 17 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 18 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 19 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 20 |
Correct |
7 ms |
19892 KB |
Output is correct |
| 21 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 22 |
Correct |
7 ms |
19796 KB |
Output is correct |
| 23 |
Correct |
8 ms |
19792 KB |
Output is correct |
| 24 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 25 |
Correct |
10 ms |
19896 KB |
Output is correct |
| 26 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 27 |
Correct |
8 ms |
19784 KB |
Output is correct |
| 28 |
Correct |
8 ms |
19840 KB |
Output is correct |
| 29 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 30 |
Correct |
9 ms |
19784 KB |
Output is correct |
| 31 |
Correct |
9 ms |
19780 KB |
Output is correct |
| 32 |
Correct |
8 ms |
19872 KB |
Output is correct |
| 33 |
Correct |
8 ms |
19784 KB |
Output is correct |
| 34 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 35 |
Correct |
7 ms |
19784 KB |
Output is correct |
| 36 |
Correct |
8 ms |
19896 KB |
Output is correct |
| 37 |
Correct |
8 ms |
19788 KB |
Output is correct |
| 38 |
Correct |
8 ms |
19860 KB |
Output is correct |
| 39 |
Correct |
8 ms |
19784 KB |
Output is correct |
| 40 |
Correct |
9 ms |
19796 KB |
Output is correct |
| 41 |
Correct |
8 ms |
19884 KB |
Output is correct |
| 42 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 43 |
Correct |
10 ms |
19808 KB |
Output is correct |
| 44 |
Correct |
8 ms |
19836 KB |
Output is correct |
| 45 |
Correct |
8 ms |
19784 KB |
Output is correct |
| 46 |
Correct |
9 ms |
19796 KB |
Output is correct |
| 47 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 48 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 49 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 50 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 51 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 52 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 53 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 54 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 55 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 56 |
Correct |
7 ms |
19796 KB |
Output is correct |
| 57 |
Correct |
8 ms |
19784 KB |
Output is correct |
| 58 |
Correct |
8 ms |
19792 KB |
Output is correct |
| 59 |
Correct |
8 ms |
19784 KB |
Output is correct |
| 60 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 61 |
Correct |
7 ms |
19796 KB |
Output is correct |
| 62 |
Correct |
8 ms |
19872 KB |
Output is correct |
| 63 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 64 |
Correct |
8 ms |
19796 KB |
Output is correct |
| 65 |
Correct |
44 ms |
23692 KB |
Output is correct |
| 66 |
Correct |
44 ms |
23616 KB |
Output is correct |
| 67 |
Correct |
47 ms |
23644 KB |
Output is correct |
| 68 |
Correct |
45 ms |
23560 KB |
Output is correct |
| 69 |
Correct |
43 ms |
23644 KB |
Output is correct |
| 70 |
Correct |
43 ms |
23636 KB |
Output is correct |
| 71 |
Correct |
42 ms |
23524 KB |
Output is correct |
| 72 |
Correct |
43 ms |
23532 KB |
Output is correct |
| 73 |
Correct |
41 ms |
23568 KB |
Output is correct |
| 74 |
Correct |
43 ms |
23612 KB |
Output is correct |
| 75 |
Correct |
42 ms |
23580 KB |
Output is correct |
| 76 |
Correct |
42 ms |
23640 KB |
Output is correct |
| 77 |
Correct |
45 ms |
23584 KB |
Output is correct |
| 78 |
Correct |
44 ms |
23640 KB |
Output is correct |
| 79 |
Correct |
42 ms |
23604 KB |
Output is correct |
| 80 |
Correct |
46 ms |
23584 KB |
Output is correct |
| 81 |
Correct |
46 ms |
23580 KB |
Output is correct |
| 82 |
Correct |
43 ms |
23632 KB |
Output is correct |
| 83 |
Correct |
47 ms |
23620 KB |
Output is correct |
| 84 |
Correct |
54 ms |
23720 KB |
Output is correct |
| 85 |
Correct |
50 ms |
23556 KB |
Output is correct |
| 86 |
Correct |
46 ms |
23596 KB |
Output is correct |
| 87 |
Correct |
48 ms |
23636 KB |
Output is correct |
| 88 |
Correct |
48 ms |
23688 KB |
Output is correct |
| 89 |
Correct |
46 ms |
23628 KB |
Output is correct |
| 90 |
Correct |
52 ms |
23584 KB |
Output is correct |
| 91 |
Correct |
52 ms |
23604 KB |
Output is correct |
| 92 |
Correct |
54 ms |
23580 KB |
Output is correct |
| 93 |
Correct |
51 ms |
23636 KB |
Output is correct |
| 94 |
Correct |
51 ms |
23708 KB |
Output is correct |
| 95 |
Correct |
51 ms |
23576 KB |
Output is correct |
| 96 |
Correct |
53 ms |
23692 KB |
Output is correct |
| 97 |
Correct |
51 ms |
23608 KB |
Output is correct |
| 98 |
Correct |
52 ms |
23584 KB |
Output is correct |
| 99 |
Correct |
52 ms |
23556 KB |
Output is correct |
| 100 |
Correct |
51 ms |
23668 KB |
Output is correct |
| 101 |
Correct |
52 ms |
23616 KB |
Output is correct |
| 102 |
Correct |
53 ms |
23584 KB |
Output is correct |
