#include <bits/stdc++.h>
using namespace std;
#define f first
#define s second
typedef long long ll;
const int N = 1e6+5;
int n, dp[N][5], nxt[N];
string a, b;
void operate()
{
int one = n, zero = n;
for(int i=n-1; i>=0; i--)
{
if(b[i] == '1') one = i, nxt[i] = zero;
else zero = i, nxt[i] = one;
}
}
int sol(int i, int t)
{
if(i == n) return 0;
int &ret = dp[i][t];
if(ret != -1) return ret;
ret = sol(nxt[i], t)+1;
if(t == 2 && nxt[i] != n)
{
if(b[i] == '0') ret = min(ret, sol(nxt[i], 1)+1);
else ret = min(ret, sol(nxt[i], 0)+1);
}
if((t == 1 && b[i] == '0') || (t == 0 && b[i] == '1'))
ret = min(ret, sol(nxt[i], 2)+1);
if(t == 3)
{
if(a[i] == b[i]) ret = min(ret, sol(i+1, t));
else if(b[i] == '0') ret = min(ret, min(sol(i+1, 2), sol(i+1, 0))+1);
else ret = min(ret, min(sol(i+1, 2), sol(i+1, 1))+1);
}
if(t == 2)
{
if(a[i] == b[i]) ret = min(ret, sol(i+1, 3));
else ret = min(ret, sol(i+1, t));
}
if(t == 1)
{
if(b[i] == '1') ret = min(ret, sol(i+1, t));
else if(b[i] == a[i]) ret = min(ret, sol(i+1, 3));
else ret = min(ret, min(sol(i+1, 2), sol(i+1, 0))+1);
}
if(!t)
{
if(b[i] == '0') ret = min(ret, sol(i+1, t));
else if(a[i] == b[i]) ret = min(ret, sol(i+1, 3));
else ret = min(ret, min(sol(i+1, 2), sol(i+1, 1))+1);
}
return ret;
}
int main()
{
memset(dp, -1, sizeof dp);
cin >> n >> a >> b;
operate();
cout << sol(0, 3) << endl;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
18 ms |
19836 KB |
Output is correct |
| 2 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 3 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 4 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 5 |
Correct |
22 ms |
19960 KB |
Output is correct |
| 6 |
Correct |
19 ms |
19832 KB |
Output is correct |
| 7 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 8 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 9 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 10 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 11 |
Correct |
18 ms |
20088 KB |
Output is correct |
| 12 |
Correct |
18 ms |
19836 KB |
Output is correct |
| 13 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 14 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 15 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 16 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 17 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 18 |
Correct |
18 ms |
19836 KB |
Output is correct |
| 19 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 20 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 21 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 22 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 23 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 24 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 25 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 26 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 27 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 28 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 29 |
Correct |
18 ms |
20004 KB |
Output is correct |
| 30 |
Correct |
19 ms |
19960 KB |
Output is correct |
| 31 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 32 |
Correct |
18 ms |
19932 KB |
Output is correct |
| 33 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 34 |
Correct |
18 ms |
19832 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
18 ms |
19836 KB |
Output is correct |
| 2 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 3 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 4 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 5 |
Correct |
22 ms |
19960 KB |
Output is correct |
| 6 |
Correct |
19 ms |
19832 KB |
Output is correct |
| 7 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 8 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 9 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 10 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 11 |
Correct |
18 ms |
20088 KB |
Output is correct |
| 12 |
Correct |
18 ms |
19836 KB |
Output is correct |
| 13 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 14 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 15 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 16 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 17 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 18 |
Correct |
18 ms |
19836 KB |
Output is correct |
| 19 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 20 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 21 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 22 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 23 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 24 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 25 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 26 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 27 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 28 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 29 |
Correct |
18 ms |
20004 KB |
Output is correct |
| 30 |
Correct |
19 ms |
19960 KB |
Output is correct |
| 31 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 32 |
Correct |
18 ms |
19932 KB |
Output is correct |
| 33 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 34 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 35 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 36 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 37 |
Correct |
19 ms |
20088 KB |
Output is correct |
| 38 |
Correct |
18 ms |
19980 KB |
Output is correct |
| 39 |
Correct |
19 ms |
19960 KB |
Output is correct |
| 40 |
Correct |
19 ms |
19964 KB |
Output is correct |
| 41 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 42 |
Correct |
19 ms |
19960 KB |
Output is correct |
| 43 |
Correct |
19 ms |
19900 KB |
Output is correct |
| 44 |
Correct |
20 ms |
19960 KB |
Output is correct |
| 45 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 46 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 47 |
Correct |
19 ms |
19960 KB |
Output is correct |
| 48 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 49 |
Correct |
19 ms |
19964 KB |
Output is correct |
| 50 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 51 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 52 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 53 |
Correct |
19 ms |
19932 KB |
Output is correct |
| 54 |
Correct |
18 ms |
19912 KB |
Output is correct |
| 55 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 56 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 57 |
Correct |
19 ms |
19960 KB |
Output is correct |
| 58 |
Correct |
19 ms |
19960 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 2 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 3 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 4 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 5 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 6 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 7 |
Correct |
212 ms |
90188 KB |
Output is correct |
| 8 |
Correct |
266 ms |
90124 KB |
Output is correct |
| 9 |
Correct |
264 ms |
89956 KB |
Output is correct |
| 10 |
Correct |
270 ms |
90028 KB |
Output is correct |
| 11 |
Correct |
267 ms |
90084 KB |
Output is correct |
| 12 |
Correct |
264 ms |
89960 KB |
Output is correct |
| 13 |
Correct |
180 ms |
29156 KB |
Output is correct |
| 14 |
Correct |
184 ms |
28924 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
18 ms |
19836 KB |
Output is correct |
| 2 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 3 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 4 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 5 |
Correct |
22 ms |
19960 KB |
Output is correct |
| 6 |
Correct |
19 ms |
19832 KB |
Output is correct |
| 7 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 8 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 9 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 10 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 11 |
Correct |
18 ms |
20088 KB |
Output is correct |
| 12 |
Correct |
18 ms |
19836 KB |
Output is correct |
| 13 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 14 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 15 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 16 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 17 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 18 |
Correct |
18 ms |
19836 KB |
Output is correct |
| 19 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 20 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 21 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 22 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 23 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 24 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 25 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 26 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 27 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 28 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 29 |
Correct |
18 ms |
20004 KB |
Output is correct |
| 30 |
Correct |
19 ms |
19960 KB |
Output is correct |
| 31 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 32 |
Correct |
18 ms |
19932 KB |
Output is correct |
| 33 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 34 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 35 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 36 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 37 |
Correct |
19 ms |
20088 KB |
Output is correct |
| 38 |
Correct |
18 ms |
19980 KB |
Output is correct |
| 39 |
Correct |
19 ms |
19960 KB |
Output is correct |
| 40 |
Correct |
19 ms |
19964 KB |
Output is correct |
| 41 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 42 |
Correct |
19 ms |
19960 KB |
Output is correct |
| 43 |
Correct |
19 ms |
19900 KB |
Output is correct |
| 44 |
Correct |
20 ms |
19960 KB |
Output is correct |
| 45 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 46 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 47 |
Correct |
19 ms |
19960 KB |
Output is correct |
| 48 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 49 |
Correct |
19 ms |
19964 KB |
Output is correct |
| 50 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 51 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 52 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 53 |
Correct |
19 ms |
19932 KB |
Output is correct |
| 54 |
Correct |
18 ms |
19912 KB |
Output is correct |
| 55 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 56 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 57 |
Correct |
19 ms |
19960 KB |
Output is correct |
| 58 |
Correct |
19 ms |
19960 KB |
Output is correct |
| 59 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 60 |
Correct |
18 ms |
19832 KB |
Output is correct |
| 61 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 62 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 63 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 64 |
Correct |
18 ms |
19960 KB |
Output is correct |
| 65 |
Correct |
212 ms |
90188 KB |
Output is correct |
| 66 |
Correct |
266 ms |
90124 KB |
Output is correct |
| 67 |
Correct |
264 ms |
89956 KB |
Output is correct |
| 68 |
Correct |
270 ms |
90028 KB |
Output is correct |
| 69 |
Correct |
267 ms |
90084 KB |
Output is correct |
| 70 |
Correct |
264 ms |
89960 KB |
Output is correct |
| 71 |
Correct |
180 ms |
29156 KB |
Output is correct |
| 72 |
Correct |
184 ms |
28924 KB |
Output is correct |
| 73 |
Correct |
239 ms |
89824 KB |
Output is correct |
| 74 |
Correct |
214 ms |
89828 KB |
Output is correct |
| 75 |
Correct |
269 ms |
89888 KB |
Output is correct |
| 76 |
Correct |
271 ms |
89956 KB |
Output is correct |
| 77 |
Correct |
264 ms |
89824 KB |
Output is correct |
| 78 |
Correct |
265 ms |
89960 KB |
Output is correct |
| 79 |
Correct |
225 ms |
89984 KB |
Output is correct |
| 80 |
Correct |
269 ms |
89832 KB |
Output is correct |
| 81 |
Correct |
266 ms |
89992 KB |
Output is correct |
| 82 |
Correct |
265 ms |
89828 KB |
Output is correct |
| 83 |
Correct |
181 ms |
27364 KB |
Output is correct |
| 84 |
Correct |
180 ms |
27364 KB |
Output is correct |
| 85 |
Correct |
181 ms |
27364 KB |
Output is correct |
| 86 |
Correct |
181 ms |
27364 KB |
Output is correct |
| 87 |
Correct |
186 ms |
28512 KB |
Output is correct |
| 88 |
Correct |
190 ms |
28584 KB |
Output is correct |
| 89 |
Correct |
185 ms |
28516 KB |
Output is correct |
| 90 |
Correct |
191 ms |
28544 KB |
Output is correct |
| 91 |
Correct |
211 ms |
42852 KB |
Output is correct |
| 92 |
Correct |
234 ms |
52044 KB |
Output is correct |
| 93 |
Correct |
245 ms |
58596 KB |
Output is correct |
| 94 |
Correct |
244 ms |
58468 KB |
Output is correct |
| 95 |
Correct |
244 ms |
58468 KB |
Output is correct |
| 96 |
Correct |
261 ms |
58468 KB |
Output is correct |
| 97 |
Correct |
244 ms |
58704 KB |
Output is correct |
| 98 |
Correct |
243 ms |
58468 KB |
Output is correct |
| 99 |
Correct |
244 ms |
58568 KB |
Output is correct |
| 100 |
Correct |
243 ms |
58644 KB |
Output is correct |
| 101 |
Correct |
244 ms |
58596 KB |
Output is correct |
| 102 |
Correct |
243 ms |
58652 KB |
Output is correct |
