added polynomial addition

poly.py

@@ -9,6 +9,22 @@ class Polynomial:
         self.degree = len(coef_list) - 1
         self.coefficients = coef_list
 
+    @staticmethod
+    def add(p1, p2):
+        result = []
+        f = p1.coefficients
+        g = p2.coefficients
+        if len(f) >= len(g):
+            result = f
+            for i in range(0, len(g)):
+                result[i] = f[i] + g[i]
+        else:
+            result = g
+            for i in range(0, len(f)):
+                result[i] = f[i] + g[i]
+        result = [x % int(Polynomial.n) for x in result]        
+        return Polynomial(result)
+
     @staticmethod
     def multiply(p1, p2):
         result = [0] * (p1.degree + p2.degree + 1)
@@ -17,14 +33,14 @@ class Polynomial:
         for i in range(0, len(f)):
             for j in range(0, len(g)):
                 result[i+j] += f[i] * g[j]
-        result = [x % int(n) for x in result]
+        result = [x % int(Polynomial.n) for x in result]
         return Polynomial(result)
 
     @staticmethod
     def divide(p1, p2):          
         def inverse(x):
-            for i in range(1, int(n)):
-                r = (i * x) % int(n)
+            for i in range(1, int(Polynomial.n)):
+                r = (i * x) % int(Polynomial.n)
                 if r == 1:
                     break
             else:
@@ -41,13 +57,13 @@ class Polynomial:
             tmp_coef = f_lead_coef * inverse(g_lead_coef)
             tmp_exp = len(f) - 1 - g_deg
             tmp = []
-            for i in range(tmp_exp):
+            for _ in range(tmp_exp):
                 tmp.append(0)
             tmp.append(tmp_coef)
             tmp_poly = Polynomial(tmp)
             sub = Polynomial.multiply(p2, tmp_poly)
             f = [x - y for x, y in zip(f, sub.coefficients)]
-            f = [x % int(n) for x in f]
+            f = [x % int(Polynomial.n) for x in f]
             while f and f[-1] == 0:
                 f.pop()
         return Polynomial(f)
@@ -60,6 +76,7 @@ class Polynomial:
 
 
 def main():
+    Polynomial.n =  int(sys.argv[1])
     c1 = ast.literal_eval(sys.argv[2])
     c2 = ast.literal_eval(sys.argv[3])
 
@@ -86,5 +103,4 @@ def main():
     print(ans)
 
 if __name__ == "__main__":
-    n =  int(sys.argv[1])
     main()