feat(leetcode): add No.478

Author: mickey0524

478.Generate_Random_Point_in_a_Circle.py

@@ -0,0 +1,37 @@
+# https://leetcode.com/problems/generate-random-point-in-a-circle/description/
+#
+# algorithms
+# Medium (33.3%)
+# Total Accepted:    2.2k
+# Total Submissions: 6.6k
+# beats 65.29% of python submissions
+
+
+from random import uniform
+
+
+class Solution(object):
+
+    def __init__(self, radius, x_center, y_center):
+        """
+        :type radius: float
+        :type x_center: float
+        :type y_center: float
+        """
+        self.r = radius
+        self.x = x_center
+        self.y = y_center
+
+    def randPoint(self):
+        """
+        :rtype: List[float]
+        """
+        r = random.triangular(0, self.r, self.r)
+        theta = random.uniform(-math.pi, math.pi)
+
+        return [self.x + r * math.cos(theta), self.y + r * math.sin(theta)]
+
+
+# Your Solution object will be instantiated and called as such:
+# obj = Solution(radius, x_center, y_center)
+# param_1 = obj.randPoint()