Submission #4098593

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Source Code Expand

#include <iostream>
#include <string>
#include <vector>
#include <deque>
#include <map>
#include <algorithm>
#include <cstdlib>
#include <cmath>
#include <numeric>
#include <utility>
#include <queue>

#define ALL_OF(x) (x).begin(), (x).end()
#define REP(i,n) for(int i=0, i##_len=(n); i<i##_len; i++)
template<class T> bool chmax(T &a, const T &b) {if (a < b) {a = b; return 1;} return 0; }
template<class T> bool chmin(T &a, const T &b) {if (a > b) {a = b; return 1;} return 0; }

typedef long long ll;
using namespace std;

int main() {
    
    int n;
    string a, b, c;
    cin >> n >> a >> b >> c;

    int ans = 0;
    REP(i, n) {
        if (a[i] != b[i] && b[i] != c[i] && c[i] != a[i])
            ans += 2;
        else if (a[i] != b[i] || b[i] != c[i] || c[i] != a[i])
            ans++;
    }

    cout << ans << endl;
    
}

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