diff --git a/src/files/Planner/CompilationSupervisor.h b/src/files/Planner/CompilationSupervisor.h
index b757451e..4bc7b44f 100644
--- a/src/files/Planner/CompilationSupervisor.h
+++ b/src/files/Planner/CompilationSupervisor.h
@@ -8,6 +8,7 @@ public:
 	CompilationSupervisor() {
 		this->init("compilationTasks", 4);
 	}
+
 	CompilationTask* getTaskById(long task_id) {
 		for (long i = 0; i < getLength(); ++i) {
 			CompilationTask* task = get(i);
@@ -16,7 +17,8 @@ public:
 		}
 		return NULL;
 	}
-	virtual String getStatePrefix() {
+
+	String getStatePrefix() override {
 		return String("Compilation");
 	}
 };
\ No newline at end of file
diff --git a/src/files/Planner/RunSupervisor.h b/src/files/Planner/RunSupervisor.h
index d0823240..c3fdfd7c 100644
--- a/src/files/Planner/RunSupervisor.h
+++ b/src/files/Planner/RunSupervisor.h
@@ -19,7 +19,8 @@ public:
 				task->printState().getCharArray());
 		}
 	}
-	virtual String getStatePrefix() {
+
+	String getStatePrefix() override {
 		return String("Running");
 	}
 };
diff --git a/src/files/Planner/RunTask.h b/src/files/Planner/RunTask.h
index 31da0c07..8f8da661 100644
--- a/src/files/Planner/RunTask.h
+++ b/src/files/Planner/RunTask.h
@@ -11,7 +11,7 @@ class RunTask : public Task {
 	String args;
 	CompilationTask* parent;
 public:
-	virtual void print() const {
+	void print() const override {
 		printf("id=%ld; maxtime=%d; testcompilationtask_id=%ld; matrix=%s; environments=%s; usr_par=%s; args=%s kernels=%d\n",
 			id,
 			maxtime,
@@ -60,7 +60,7 @@ public:
 		setKernels(lines->get(offset + 7));
 	}
 
-	virtual String getLaunchScriptText() {
+	String getLaunchScriptText() override {
 		String modules = userWorkspace + "/modules";
 		String starterCall = modules + "/starter";
 		String launcherCall = modules + "/launcher";
@@ -77,7 +77,8 @@ public:
 			String::DQuotes("killall -SIGKILL " + binary_name) + " " +
 			dvm_start;
 	}
-	virtual void prepareWorkspace() {
+
+	void prepareWorkspace() override {
 		String binary_src = parent->getWorkspace() + "/0";
 		String binary_dst = workspace + "/" + binary_name;
 		Utils::Copy(binary_src, binary_dst);
@@ -86,14 +87,16 @@ public:
 			File parFile = File(parPath, usr_par);
 		}
 	}
-	virtual String getStartCommand() {
+	
+	String getStartCommand() override {
 		String res = workspace + "/run";
 		if (!environments.isEmpty())
 			res = environments + " " + res;
 		printf("START %ld: %s\n", id, res.getCharArray());
 		return res;
 	}
-	virtual String copyResults(const String& pathRes) {
+
+	String copyResults(const String& pathRes) override {
 	    String resultPath = Task::copyResults(pathRes);
 		if (Utils::Exists(workspace + "/sts.gz+")) {
 		    String stsPath(resultPath + "/statistic.txt");
diff --git a/src/files/Planner/Supervisor.h b/src/files/Planner/Supervisor.h
index e3d91d6b..c7f3aea1 100644
--- a/src/files/Planner/Supervisor.h
+++ b/src/files/Planner/Supervisor.h
@@ -124,9 +124,13 @@ public:
         Utils::Mkdir(pathRes);
         string buf;
 
+        vector<int> emptyKeys;
+        vector<T*> toDel;
+
         while (activeTasks) {
             long oldActiveTasks = activeTasks;
-            vector<int> emptyKeys;
+            emptyKeys.clear();
+            toDel.clear();
 
             //ставим задачи от больших к меньшему по ядрам
             for (auto& elem : sortedByKernelNeeds) {
@@ -156,8 +160,7 @@ public:
             // очищаем от пустых ключей
             for (auto& empty : emptyKeys)
                 sortedByKernelNeeds.erase(empty);
-
-            vector<T*> toDel;
+            
             // проверяем нет ли завершившихся задач
             for (auto& task : activeTaskSet)
             {
@@ -173,6 +176,7 @@ public:
                 }
             }
 
+            // очищаем завершенные задачи
             for (auto& del : toDel)
                 activeTaskSet.erase(del);
 
@@ -182,7 +186,7 @@ public:
 
         changeState();
 
-        String outFile(pathRes + "/"+getStatePrefix()+"Info.txt");
+        String outFile(pathRes + "/" + getStatePrefix() + "Info.txt");
         File tmp(outFile, String(buf.c_str()));
     }
     void saveState() {
diff --git a/src/files/Planner/Utils.h b/src/files/Planner/Utils.h
index cb6fbb86..6d6f864e 100644
--- a/src/files/Planner/Utils.h
+++ b/src/files/Planner/Utils.h
@@ -31,19 +31,23 @@ public:
 
 	//https://stackoverflow.com/questions/4568681/using-chmod-in-a-c-program
 	static void Chmod(const String& path) {
-	    #if __cplusplus >= 201703L
+#if __cplusplus >= 201703L
         	std::filesystem::permissions(path.getCharArray(), std::filesystem::perms::all);
-        #else
+#else
         	String command = "chmod 777 " + String::DQuotes(path);
             int i=system(command.getCharArray());
             printf("chmod 777 '%s' return code = %d\n", path.getCharArray(), i);
-      #endif
+#endif
 	}
 
 	//https://stackoverflow.com/questions/230062/whats-the-best-way-to-check-if-a-file-exists-in-c
 	static bool Exists(const String& path) {
+#if __cplusplus >= 201703L
+		return std::filesystem::exists(path.getCharArray());
+#else
 		struct stat buffer;
 		return (stat(path.getCharArray(), &buffer) == 0);
+#endif
 	}
 
 	//in seconds
@@ -52,22 +56,22 @@ public:
 		std::this_thread::sleep_for(timespan);
 	}
 	static void Copy(const String& src, const String& dst) {
-		#if __cplusplus >= 201703L
+#if __cplusplus >= 201703L
 	        std::filesystem::copy(src.getCharArray(), dst.getCharArray());
-	    #else
+#else
 		    String command = "cp " + String::DQuotes(src) + " " + String::DQuotes(dst);
 		    int i = system(command.getCharArray());
 		    printf("cp '%s' return code = %d\n",src.getCharArray(), i);
-		#endif
+#endif
 	}
 	static void CopyDirectory(const String& src, const String& dst) {
-    	#if __cplusplus >= 201703L
+#if __cplusplus >= 201703L
         	std::filesystem::copy((src+ "/.").getCharArray(), dst.getCharArray(), std::filesystem::copy_options::recursive);
-        #else
+#else
         	String command = "cp -r " + String::DQuotes(src + "/.") + " " + String::DQuotes(dst);
             int i = system(command.getCharArray());
             printf("cp -r '%s' return code = %d\n",src.getCharArray(),i);
-        #endif
+#endif
     }
 	static time_t getAbsoluteTime() {
 		return time(NULL);