Data commit

Task/Modular-exponentiation/Swift/modular-exponentiation.swift

@@ -0,0 +1,31 @@
+import BigInt
+
+func modPow<T: BinaryInteger>(n: T, e: T, m: T) -> T {
+  guard e != 0 else {
+    return 1
+  }
+
+  var res = T(1)
+  var base = n % m
+  var exp = e
+
+  while true {
+    if exp & 1 == 1 {
+      res *= base
+      res %= m
+    }
+
+    if exp == 1 {
+      return res
+    }
+
+    exp /= 2
+    base *= base
+    base %= m
+  }
+}
+
+let a = BigInt("2988348162058574136915891421498819466320163312926952423791023078876139")
+let b = BigInt("2351399303373464486466122544523690094744975233415544072992656881240319")
+
+print(modPow(n: a, e: b, m: BigInt(10).power(40)))