add so

leetcode/design/933.NumberOfRecentCalls/numberOfRecentCalls.go

@@ -0,0 +1,23 @@
+package main
+
+type RecentCounter struct {
+	q []int
+}
+
+func Constructor() RecentCounter {
+	return RecentCounter{[]int{}}
+}
+
+func (this *RecentCounter) Ping(t int) int {
+	this.q = append(this.q, t)
+	for this.q[0] < t-3000 {
+		this.q = this.q[1:]
+	}
+	return len(this.q)
+}
+
+/**
+ * Your RecentCounter object will be instantiated and called as such:
+ * obj := Constructor();
+ * param_1 := obj.Ping(t);
+ */