#pragma GCC optimize("Ofast,unroll-loops")
#pragma GCC target("avx,avx2,bmi,bmi2,fma,popcnt,popclz")
#include<bits/stdc++.h>
using namespace std;
#define int long long
int n, dp[1000005][3][2];
string a, b;
inline void upd(int& a, int b) {a=min(a, b);}
void solve() {
cin >> n >> a >> b;
for (char &i:a) i-='0';
for (char &i:b) i-='0';
a = ' ' + a, b = ' ' + b;
memset(dp, 0x3f, sizeof(dp));
int inf = dp[0][2][0]; dp[0][2][0]=0;
for (int i = 0; i < n; i++)
for (int j = 0; j < 3; j++)
for (int k = 0; k < 2; k++)
for (int j1 = 0; j1 < 3; j1++)
for (int k1 = 0; k1 < 2; k1++)
if (k1^(j1<2?j1:a[i+1])==b[i+1])
upd(dp[i+1][j1][k1], k1^(j1<2?j1:a[i+1])==b[i+1] ? dp[i][j][k] + (j1<2 && j!=j1) + (k1==1 && k!=k1) : inf);
int res=inf;
for (int i=0; i<3; i++)
for (int j=0; j<2; j++)
upd(res, dp[n][i][j]);
cout << res;
}
signed main() {
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
solve();
}
Compilation message
cc1plus: error: attribute 'popclz' argument 'target' is unknown
lamp.cpp: In function 'void solve()':
lamp.cpp:22:48: warning: suggest parentheses around comparison in operand of '^' [-Wparentheses]
22 | if (k1^(j1<2?j1:a[i+1])==b[i+1])
lamp.cpp:23:69: warning: suggest parentheses around comparison in operand of '^' [-Wparentheses]
23 | upd(dp[i+1][j1][k1], k1^(j1<2?j1:a[i+1])==b[i+1] ? dp[i][j][k] + (j1<2 && j!=j1) + (k1==1 && k!=k1) : inf);
