Maximize Distance to Closest Person

class Solution {
public:
    int maxDistToClosest(vector<int>& seats) {
        int n = seats.size(), last = -1, ans = 0;
        for (int i = 0; i < n; i++) {
            if (seats[i] == 1) {
                if (last == -1) ans = max(ans, i);
                else ans = max(ans, (i - last) / 2);

                last = i;
            }
        }

        ans = max(ans, n - last - 1);
        return ans;
    }
};