萤火虫-N6

Author: yasinshaw

src/main/java/N1_100/N6.java

@@ -0,0 +1,20 @@
+package N1_100;
+
+public class N6 {
+    public String convert(String s, int numRows) {
+        if (numRows == 1) {
+            return s;
+        }
+        StringBuilder stringBuilder = new StringBuilder();
+        int cycleLen = 2 * numRows - 2;
+        int n = s.length();
+        for (int i = 0; i < numRows; i++) {
+            for (int j = 0; j + i < n; j += cycleLen) {
+                stringBuilder.append(s.charAt(j + i));
+                if (i != 0 && i != numRows - 1 && j + cycleLen - i < n)
+                    stringBuilder.append(s.charAt(j + cycleLen - i));
+            }
+        }
+        return stringBuilder.toString();
+    }
+}