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grigorevmp · Apr 29, 2022 · e7da484 · e7da484
1 parent 8d94224
commit e7da484
Showing 1 changed file with 18 additions and 14 deletions.
diff --git a/7-reverse-integer/7-reverse-integer.kt b/7-reverse-integer/7-reverse-integer.kt
@@ -1,22 +1,26 @@
 class Solution {
     fun reverse(x: Int): Int {
         try{
-            var x_c = Math.abs(x)
-
-            var str = if (x < 0){
-                "-"
-            } else ""
-
-            while (x_c != 0){
-                val ch = x_c % 10
-                if (((str == "") and (ch != 0)) or (str != "")){
-                    str += ch
-                }
-                x_c /= 10
+            var xx = x
+            var sign_ = 1
+            if (x < 0) {
+                sign_ = -1
+                xx = sign_ * xx
             }
 
-            return str.toInt()
-
+            var res = 0
+            while (xx > 0) {
+
+            if (res * sign_ > Integer.MAX_VALUE / 10 || res * sign_ < Integer.MIN_VALUE / 10) {
+                return 0
+              }
+
+              res = res * 10 + xx % 10
+              xx = xx / 10
+            }
+
+            return (sign_ * res)
+
 
             }
         catch(e: Exception){