请问C题这样为什么只能过72%呀，求调。

#include <bits/stdc++.h>
#define int long long
#define endl '\n'

using namespace std;

using ll = long long;
using ull = unsigned long long;
using pii = pair<int, int>;
using vi = vector<int>;
using vll = vector<long long>;

const int N = 1e5 + 10, INF = 1e9 + 10, mod = 1e9 + 7;

void wyx() {
	int n, x, y;
    cin >> n >> x >> y;
    string a, b, c, s;
    cin >> a >> b >> c;
    int ans = 0;
    int cnt = 0;
    vector<int> sum(4, 0);
    for (int i = 0; i < n; i ++ )
    {
        int ai = a[i] - '0';
        int bi = b[i] - '0';
        int ci = c[i] - '0';
        if (ai ^ bi != ci)
        {
            cnt ++ ;
            if (ai == 0 && bi == 0) sum[0] ++ ;
            else if (ai == 0 && bi == 1) sum[1] ++ ;
            else if (ai == 1 && bi == 0) sum[2] ++ ;
            else if (ai == 1 && bi == 1) sum[3] ++ ;
        }
    }
    if (x * 2 <= y)
    {
        cout << x * cnt << endl;
        return;
    }
    while (1)
    {
        sort(sum.begin(), sum.end());
        ans += sum[2] * y;
        sum[3] -= sum[2];
        sum[2] -= sum[2];
        int count = 0;
        for (int i = 0; i < 4; i ++ ) if (sum[i]) count ++ ;
        if (count <= 1) break;
    }
    for (int i = 0; i < 4; i ++ ) ans += sum[i] * x;
    cout << ans << endl;
}

signed main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	int t = 1;
	//cin >> t;
	while(t--) {
		wyx();
	}
	
	return 0;
}