This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
#define fast ios::sync_with_stdio(0);cin.tie(0);
typedef long long ll;
#define f first
#define s second
#define MOD 998244353
#define LOGN 21
const ll MAXN = 1e6 + 100;
int dp[MAXN][6];
// 0 : değişiklik yok
// 1 : hepsi 0
// 2 : hepsi 1
// 3 : ters çevir
// 4 : önce sıfırla sonra çevir
// 5 : önce birle sonra çevir
int main() {
fast
int N;
string S, T;
cin >> N >> S >> T;
for (int i = 0; i < N; i++)
S[i] = (S[i] != T[i] ? '1' : '0');
for (int i = 0; i < MAXN; i++) {
for (int j = 0; j < 6; j++)
dp[i][j] = 1e9;
}
dp[0][0] = 0;
S = "#" + S;
for (int i = 1; i <= N; i++) {
if (S[i] == '1') {
dp[i][3] = min({dp[i-1][0] + 1, dp[i-1][1] + 1, dp[i-1][2] + 1, dp[i-1][3], dp[i-1][4], dp[i-1][5]});
if (T[i-1] == '1') {
dp[i][2] = min({dp[i-1][0] + 1, dp[i-1][1] + 1, dp[i-1][2], dp[i-1][3] + 1, dp[i-1][4] + 1, dp[i-1][5]});
dp[i][4] = min({dp[i-1][0] + 2, dp[i-1][1] + 1, dp[i-1][2] + 2, dp[i-1][3] + 1, dp[i-1][4], dp[i-1][5] + 1});
} else {
dp[i][1] = min({dp[i-1][0] + 1, dp[i-1][1], dp[i-1][2] + 1, dp[i-1][3] + 1, dp[i-1][4], dp[i-1][5] + 1});
dp[i][5] = min({dp[i-1][0] + 2, dp[i-1][1] + 2, dp[i-1][2] + 1, dp[i-1][3] + 1, dp[i-1][4] + 1, dp[i-1][5]});
}
} else {
dp[i][0] = min({dp[i-1][0], dp[i-1][1], dp[i-1][2], dp[i-1][3], dp[i-1][4], dp[i-1][5]});
if (T[i-1] == '1') {
dp[i][2] = min({dp[i-1][0] + 1, dp[i-1][1] + 1, dp[i-1][2], dp[i-1][3] + 1, dp[i-1][4] + 1, dp[i-1][5]});
dp[i][4] = min({dp[i-1][0] + 2, dp[i-1][1] + 1, dp[i-1][2] + 2, dp[i-1][3] + 1, dp[i-1][4], dp[i-1][5] + 1});
} else {
dp[i][2] = min({dp[i-1][0] + 1, dp[i-1][1] + 1, dp[i-1][2], dp[i-1][3] + 1, dp[i-1][4] + 1, dp[i-1][5]});
dp[i][5] = min({dp[i-1][0] + 2, dp[i-1][1] + 2, dp[i-1][2] + 1, dp[i-1][3] + 1, dp[i-1][4] + 1, dp[i-1][5]});
}
}
}
cout << min({dp[N][0], dp[N][1], dp[N][2], dp[N][3], dp[N][4]}) << "\n";
}
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