diff --git a/.metadata/.log b/.metadata/.log
index 0ab30ca..29ffc49 100644
--- a/.metadata/.log
+++ b/.metadata/.log
@@ -365,3 +365,12 @@ java.lang.IllegalArgumentException: Argument cannot be null
 	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:584)
 	at org.eclipse.equinox.launcher.Main.run(Main.java:1438)
 	at org.eclipse.equinox.launcher.Main.main(Main.java:1414)
+!SESSION 2017-10-03 09:41:45.590 -----------------------------------------------
+eclipse.buildId=debbuild
+java.version=1.7.0_131
+java.vendor=Oracle Corporation
+BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=zh_CN
+Command-line arguments:  -os linux -ws gtk -arch x86_64
+
+!ENTRY org.eclipse.core.resources 2 10035 2017-10-03 09:41:52.109
+!MESSAGE The workspace exited with unsaved changes in the previous session; refreshing workspace to recover changes.
diff --git a/.metadata/.plugins/org.eclipse.jdt.core/savedIndexNames.txt b/.metadata/.plugins/org.eclipse.jdt.core/savedIndexNames.txt
index 64612a1..2f071d6 100644
--- a/.metadata/.plugins/org.eclipse.jdt.core/savedIndexNames.txt
+++ b/.metadata/.plugins/org.eclipse.jdt.core/savedIndexNames.txt
@@ -1,9 +1,22 @@
 INDEX VERSION 1.126+/home/liyafei/test/IntroductionToAlgorithm/.metadata/.plugins/org.eclipse.jdt.core
+2307328643.index
 852849552.index
 973379314.index
 3390519334.index
-3061194237.index
+3938652823.index
 2802546564.index
+3061194237.index
+3542660237.index
+2259717368.index
 729414795.index
+989528713.index
 1461246288.index
+1259291233.index
+2598035366.index
+3900037835.index
+460152253.index
+392775124.index
+1513993030.index
 1320441419.index
+2426646370.index
+664741535.index