【算法】贪心

#include <iostream>
using namespace std;

int main()
{
    int n;
    cin >> n;
    string str1, str2, str3;
    cin >> str1 >> str2;
    int l = -1, r = -1, ret = n;
    for (int i = 0; i < n; i++)
    {
        cin >> str3;
        if (str1 == str3) l = i;
        if (str2 == str3) r = i;
        if (l != -1 && r != -1) ret = min(ret, abs(r - l));
    }
    if (l == -1 || r == -1)
        cout << -1;
    else cout << ret;
    return 0;
}