💍 P5-28474

Author: jyh071116

💍 P5/28474.py

@@ -0,0 +1,34 @@
+t = int(input())
+
+def totient(n):
+  factor = {}
+  while n != 1:
+    for i in range(2, int(n**0.5)+1):
+      if n % i == 0:
+        n //= i
+        try:
+          factor[i] += 1
+        except:
+          factor[i] = 1
+        break
+    else:
+      try:
+          factor[n] += 1
+      except:
+        factor[n] = 1
+      n = 1
+  res = 1
+  for i in factor.keys():
+    n *= i**factor[i]
+    res *= i**factor[i] - i**(factor[i]-1)
+  if not factor:
+    res = 0
+  return res
+
+for _ in range(t):
+  n = int(input())
+  if n & 1:
+    res = totient(n)
+  else:
+    res = totient(n) + totient(n//2)
+  print(res)