diff --git a/2201/220116.cpp b/2201/220116.cpp
index 7f51ced..8b140e1 100644
--- a/2201/220116.cpp
+++ b/2201/220116.cpp
@@ -1,2 +1,25 @@
 #include <iostream>
+#include <vector>
 
+class Solution {
+public:
+	static int maxDistToClosest(const std::vector<int>& seats) {
+		int pos = 0;
+		for (; !seats[pos]; ++pos);
+
+		// pos is now the 1st '1'.
+		int ret = pos, prev = pos, n = seats.size();
+		for (++pos; pos < n; ++pos) {
+			if (seats[pos]) {
+				ret = ret > (pos - prev) >> 1 ? ret : (pos - prev) >> 1;
+				prev = pos;
+			}
+		}
+		return std::max(ret, n - 1 - prev);
+	}
+};
+
+int main() {
+	std::printf("%d\n", Solution::maxDistToClosest({1, 0, 0, 0, 1, 0, 1}));
+	return 0;
+}
\ No newline at end of file