Data commit

Task/Look-and-say-sequence/Objective-C/look-and-say-sequence.m

@@ -0,0 +1,35 @@
+#import <Foundation/Foundation.h>
+
+-(NSString*)lookAndSay:(NSString *)word{
+    if (!word) {
+        return nil;
+    }
+    NSMutableString *result = [NSMutableString new];
+
+    char repeat = [word characterAtIndex:0];
+    int times = 1;
+    word = [NSString stringWithFormat:@"%@ ",[word substringFromIndex:1] ];
+
+    for (NSInteger index = 0; index < word.length; index++) {
+        char actual = [word characterAtIndex:index];
+        if (actual != repeat) {
+            [result appendFormat:@"%d%c", times, repeat];
+            times = 1;
+            repeat = actual;
+        } else {
+            times ++;
+        }
+    }
+
+    return [result copy];
+}
+
+- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
+{
+    NSString *num = @"1";
+    for (int i=1;i<=10;i++) {
+        NSLog(@"%@", num);
+
+        num = [self lookAndSay:num];
+    }
+}