Initial commit

Medium/zigzag-conversion/Solution.java

@@ -0,0 +1,26 @@
+class Solution {
+    public String convert(String str, int rows) {
+        String[] zigzag = new String[rows];
+        for (int i = 0; i < rows; i++)
+            zigzag[i] = "";
+
+        for (int i = 0, j = 0, k = 0; i < str.length(); i++) {
+            zigzag[j] += str.charAt(i);
+
+            if (j == rows - 1)
+                k = 1;
+            if (j == 0)
+                k = 0;
+            if (k == 1 && j > 0)
+                j--;
+            if (k == 0 && j < rows - 1)
+                j++;
+        }
+
+        String ret = "";
+        for (int i = 0; i < rows; i++)
+            ret += zigzag[i];
+
+        return ret;
+    }
+}