diff --git a/399-240619-pass/main.py b/399-240619-pass/main.py
new file mode 100644
index 0000000..c1b859c
--- /dev/null
+++ b/399-240619-pass/main.py
@@ -0,0 +1,55 @@
+class Solution:
+    def calcEquation(self, equations: list[list[str]], values: list[float], queries: list[list[str]]) -> list[float]:
+        vs = []
+        for equation in equations:
+            first_var = equation[0]
+            second_var = equation[1]
+            if first_var not in vs:
+                vs.append(first_var)
+            if second_var not in vs:
+                vs.append(second_var)
+        index_map = {}
+        for ind, var in enumerate(vs):
+            index_map[var] = ind
+        ls = []
+        vs_len = len(vs)
+        for ind, var in enumerate(vs):
+            ls.append([])
+            for i in range(vs_len):
+                if i == ind:
+                    ls[ind].append(1)
+                else:
+                    ls[ind].append(-1)
+        for ind, equation in enumerate(equations):
+            first_ind = index_map[equation[0]]
+            second_ind = index_map[equation[1]]
+            ls[first_ind][second_ind] = values[ind]
+            ls[second_ind][first_ind] = 1.0 / values[ind]
+        flag = 1
+        while flag == 1:
+            flag = 0
+            for i in range(vs_len):
+                for j in range(vs_len):
+                    for k in range(vs_len):
+                        if ls[i][j] != -1 : continue
+                        if ls[i][k] == -1 or ls[k][j] == -1: continue
+                        flag = 1
+                        ls[i][j] = ls[i][k] * ls[k][j]
+                        ls[j][i] = 1.0/ls[i][j]
+        output = []
+        for query in queries:
+            if query[0] not in vs or query[1] not in vs:
+                output.append(-1)
+                continue
+            first_ind = index_map[query[0]]
+            second_ind = index_map[query[1]]
+            output.append(ls[first_ind][second_ind])
+        return output
+
+
+
+
+sol = Solution()
+print(sol.calcEquation([["a", "b"], ["b", "c"]], [2.0, 3.0], [["a", "c"], ["b", "a"], ["a", "e"], ["a", "a"], ["x", "x"]]))
+print(sol.calcEquation([["a", "c"], ["b", "e"],["c", "d"], ["e", "d"]], [2.0, 3.0,0.5,5.0], [["a", "b"]]))
+