Update LongestCommonSubsequence.java

Polurival · egonSchiele · commit 0a2ed9e4bb8c · 2017-06-11T19:16:08.000-04:00
for example from the book with words 'fish' and 'fosh' where is a mistake.
diff --git a/09_dynamic_programming/java/01_longest_common_subsequence/src/LongestCommonSubsequence.java b/09_dynamic_programming/java/01_longest_common_subsequence/src/LongestCommonSubsequence.java
@@ -2,7 +2,7 @@
 
 public class LongestCommonSubsequence {
     public static void main(String[] args) {
-//        if (word_a[i] == word_b[1]) {
+//        if (word_a[i] == word_b[j]) {
 //            cell[i][j] = cell[i - 1][j - 1] + 1;
 //        } else {
 //            cell[i][j] = Math.Max(cell[i - 1][j], cell[i][j - 1]);
@@ -24,7 +24,11 @@ public static void main(String[] args) {
                     }
                 } else {
                     // The letters don't match.
-                    if (i > 0 && j > 0) {
+                    if (i == 0 && j > 0) {
+                        cell[i][j] = cell[i][j - 1];
+                    } else if (i > 0 && j == 0) {
+                        cell[i][j] = cell[i - 1][j];
+                    } else if (i > 0 && j > 0) {
                         cell[i][j] = Math.max(cell[i - 1][j], cell[i][j - 1]);
                     } else {
                         cell[i][j] = 0;
@@ -47,4 +51,4 @@ private static void printResult(int[][] arr) {
         }
     }
 
-}
+}
