add new solutions

solutions/0/q62/solution.go

@@ -0,0 +1,15 @@
+package q62
+
+func uniquePaths(m int, n int) int {
+	buf := make([]int, n)
+	buf[0] = 1
+
+	for range m {
+		for c := 1; c < n; c++ {
+			buf[c] += buf[c-1]
+		}
+	}
+	return buf[n-1]
+}
+
+var _ = uniquePaths