diff --git a/core/config/main.php b/core/config/main.php
index a9cc36b..b36c4bb 100755
--- a/core/config/main.php
+++ b/core/config/main.php
@@ -93,5 +93,5 @@
     $g_config['vote']                   = "./tmp/vote/vote.txt";
     $g_config['voteTopics']             = "./tmp/vote/voteTopics.txt_";
     $g_config['use_js_cache']           = true;
-    $g_config['engine_version']         = 78;    
+    $g_config['engine_version']         = 79;    
 ?>
diff --git a/script/entities/graph/model/Graph.js b/script/entities/graph/model/Graph.js
index 9f9163c..7a1e5d4 100644
--- a/script/entities/graph/model/Graph.js
+++ b/script/entities/graph/model/Graph.js
@@ -234,7 +234,7 @@ Graph.prototype.FindEdgeMin = function(id1, id2)
 Graph.prototype.FindEdgeMax = function(id1, id2)
 {
 	var res       = null;
-    var maxWeight = 0;
+    var maxWeight = -this.infinity;
 	for (var i = 0; i < this.edges.length; i++)
 	{
         var edge = this.edges[i];
diff --git a/script/features/algorithms/model/plugins/FindLongestPath.js b/script/features/algorithms/model/plugins/FindLongestPath.js
index 8ac3857..270e515 100644
--- a/script/features/algorithms/model/plugins/FindLongestPath.js
+++ b/script/features/algorithms/model/plugins/FindLongestPath.js
@@ -218,6 +218,10 @@ FindLongestPath.prototype.getPriority = function()
     return -9.4;
 }
 
+FindLongestPath.prototype.IsSupportNegativeWeight = function()
+{
+    return true;
+}
 
 // Factory for connected components.
 function CreateFindLongestPath(graph, app)
diff --git a/script/features/algorithms/model/plugins/FindShortPatchsFromOne.js b/script/features/algorithms/model/plugins/FindShortPatchsFromOne.js
index 6f725c1..97136b9 100644
--- a/script/features/algorithms/model/plugins/FindShortPatchsFromOne.js
+++ b/script/features/algorithms/model/plugins/FindShortPatchsFromOne.js
@@ -209,6 +209,11 @@ FindShortPatchsFromOne.prototype.IsSupportMultiGraph = function()
     return true;
 }
 
+FindShortPatchsFromOne.prototype.IsSupportNegativeWeight = function()
+{
+    return true;
+}
+
 // Factory for connected components.
 function CreateFindShortPatchsFromOne(graph, app)
 {
diff --git a/script/features/algorithms/model/plugins/MaxClique.js b/script/features/algorithms/model/plugins/MaxClique.js
index 21b4389..46bed73 100644
--- a/script/features/algorithms/model/plugins/MaxClique.js
+++ b/script/features/algorithms/model/plugins/MaxClique.js
@@ -96,6 +96,11 @@ MaxClique.prototype.IsSupportNegativeWeight = function()
     return true;
 }
 
+MaxClique.prototype.IsSupportNegativeWeight = function()
+{
+    return true;
+}
+
 function CreateMaxClique(graph, app)
 {
     return new MaxClique(graph, app)
diff --git a/script/features/algorithms/model/plugins/MaxFlow.js b/script/features/algorithms/model/plugins/MaxFlow.js
index 500a3f9..f81d774 100644
--- a/script/features/algorithms/model/plugins/MaxFlow.js
+++ b/script/features/algorithms/model/plugins/MaxFlow.js
@@ -188,13 +188,13 @@ FindMaxFlow.prototype.getPriority = function()
 }
 
 // @return true, if you change resotry graph after use.
-BaseAlgorithm.prototype.wantRestore = function()
+FindMaxFlow.prototype.wantRestore = function()
 {
     return true;
 }
 
 // calls this method if wantRestore return true.
-BaseAlgorithm.prototype.restore = function()
+FindMaxFlow.prototype.restore = function()
 {
     if (this.selectedEdges != null)
     {
@@ -216,6 +216,11 @@ BaseAlgorithm.prototype.restore = function()
     }
 }
 
+FindMaxFlow.prototype.IsSupportNegativeWeight = function()
+{
+    return true;
+}
+
 
 // Factory for connected components.
 function CreateFindMaxFlow(graph, app)
diff --git a/script/features/algorithms/model/plugins/MinimumSpanningTree.js b/script/features/algorithms/model/plugins/MinimumSpanningTree.js
index 4ce9a6b..19c8393 100644
--- a/script/features/algorithms/model/plugins/MinimumSpanningTree.js
+++ b/script/features/algorithms/model/plugins/MinimumSpanningTree.js
@@ -155,6 +155,10 @@ MinimumSpanningTree.prototype.IsSupportMultiGraph = function ()
     return true;
 }
 
+MinimumSpanningTree.prototype.IsSupportNegativeWeight = function()
+{
+    return true;
+}
 
 // Factory for algorithm.
 function CreateMinimumSpanningTree(graph, app)
diff --git a/script/features/algorithms/model/plugins/ShortestPath.js b/script/features/algorithms/model/plugins/ShortestPath.js
index 99dcb37..bfcaf5c 100644
--- a/script/features/algorithms/model/plugins/ShortestPath.js
+++ b/script/features/algorithms/model/plugins/ShortestPath.js
@@ -221,6 +221,11 @@ FindShortPathNew.prototype.IsSupportMultiGraph = function ()
     return true;
 }
 
+FindShortPathNew.prototype.IsSupportNegativeWeight = function()
+{
+    return true;
+}
+
 
 // Factory for connected components.
 function CreateFindShortPathNew(graph, app)
diff --git a/script/features/graphoffline/Graphoffline.Emscripten.wasm b/script/features/graphoffline/Graphoffline.Emscripten.wasm
index a2c1a34..12d16e6 100644
Binary files a/script/features/graphoffline/Graphoffline.Emscripten.wasm and b/script/features/graphoffline/Graphoffline.Emscripten.wasm differ
diff --git a/script/pages/editor/api/index.js.cache b/script/pages/editor/api/index.js.cache
index e845174..88c8a98 100644
--- a/script/pages/editor/api/index.js.cache
+++ b/script/pages/editor/api/index.js.cache
@@ -1,4 +1,4 @@
-moduleLoader.beginCacheLoading(["/script/shared/utils.js?v=75","/script/entities/graph/api/index.js?v=75","/script/shared/point.js?v=75","/script/entities/edge/api/index.js?v=75","/script/entities/edge/model/BaseEdge.js?v=75","/script/entities/edge/model/EdgeModel.js?v=75","/script/entities/vertex/api/index.js?v=75","/script/entities/vertex/model/BaseVertex.js?v=75","/script/entities/vertex/model/VertexModel.js?v=75","/script/entities/graph/model/Graph.js?v=75","/script/features/draw_graph/api/index.js?v=75","/script/features/draw_graph/model/BaseBackgroundDrawer.js?v=75","/script/features/draw_graph/model/BaseEdgeDrawer.js?v=75","/script/features/draw_graph/model/BaseVertexDrawer.js?v=75","/script/features/algorithms/api/index.js?v=75","/script/features/algorithms/model/Algorithms.js?v=75","/script/features/algorithms/model/BaseTraversal.js?v=75","/script/features/base_handler/index.js?v=75","/script/features/default_handler/index.js?v=75","/script/features/add_vertices_handler/index.js?v=75","/script/features/connect_vertices_handler/index.js?v=75","/script/features/delete_objects_handler/index.js?v=75","/script/features/algorithm_handler/index.js?v=75","/script/features/serialization/api/index.js?v=75","/script/features/serialization/model/GraphMLCreator.js?v=75","/script/features/enum_vertices/EnumVertices.js?v=75","/script/pages/editor/model/texts.js?v=75","/script/pages/editor/model/UndoStack.js?v=75","/script/pages/editor/model/DiskSaveLoad.js?v=75","/script/pages/editor/model/Application.js?v=75","/script/pages/editor/ui/ya_metrika.js?v=75","/script/pages/editor/ui/editor.js?v=75","/script/pages/editor/ui/main.js?v=75",]);{function onloadEditor(){console.log("onload() call");doIncludeAsync([include("shared/canvas2svg.js"),include("features/group_rename_handler/index.js"),include("features/saved_graph_handler/index.js"),include("features/saved_graph_image_handler/index.js"),include("features/show_adjacency_matrix/index.js"),include("features/show_distance_matrix/index.js"),include("features/show_incidence_matrix/index.js"),include("features/setup_background_style/index.js"),include("features/setup_edge_style/index.js"),include("features/setup_vertex_style/index.js"),]);postLoadPage();}
+moduleLoader.beginCacheLoading(["/script/shared/utils.js?v=76","/script/entities/graph/api/index.js?v=76","/script/shared/point.js?v=76","/script/entities/edge/api/index.js?v=76","/script/entities/edge/model/BaseEdge.js?v=76","/script/entities/edge/model/EdgeModel.js?v=76","/script/entities/vertex/api/index.js?v=76","/script/entities/vertex/model/BaseVertex.js?v=76","/script/entities/vertex/model/VertexModel.js?v=76","/script/entities/graph/model/Graph.js?v=76","/script/features/draw_graph/api/index.js?v=76","/script/features/draw_graph/model/BaseBackgroundDrawer.js?v=76","/script/features/draw_graph/model/BaseEdgeDrawer.js?v=76","/script/features/draw_graph/model/BaseVertexDrawer.js?v=76","/script/features/algorithms/api/index.js?v=76","/script/features/algorithms/model/Algorithms.js?v=76","/script/features/algorithms/model/BaseTraversal.js?v=76","/script/features/base_handler/index.js?v=76","/script/features/default_handler/index.js?v=76","/script/features/add_vertices_handler/index.js?v=76","/script/features/connect_vertices_handler/index.js?v=76","/script/features/delete_objects_handler/index.js?v=76","/script/features/algorithm_handler/index.js?v=76","/script/features/serialization/api/index.js?v=76","/script/features/serialization/model/GraphMLCreator.js?v=76","/script/features/enum_vertices/EnumVertices.js?v=76","/script/pages/editor/model/texts.js?v=76","/script/pages/editor/model/UndoStack.js?v=76","/script/pages/editor/model/DiskSaveLoad.js?v=76","/script/pages/editor/model/Application.js?v=76","/script/pages/editor/ui/ya_metrika.js?v=76","/script/pages/editor/ui/editor.js?v=76","/script/pages/editor/ui/main.js?v=76",]);{function onloadEditor(){console.log("onload() call");doIncludeAsync([include("shared/canvas2svg.js"),include("features/group_rename_handler/index.js"),include("features/saved_graph_handler/index.js"),include("features/saved_graph_image_handler/index.js"),include("features/show_adjacency_matrix/index.js"),include("features/show_distance_matrix/index.js"),include("features/show_incidence_matrix/index.js"),include("features/setup_background_style/index.js"),include("features/setup_edge_style/index.js"),include("features/setup_vertex_style/index.js"),]);postLoadPage();}
 let modulDir="pages/editor/";doInclude([include("shared/utils.js"),include("entities/graph/api/index.js"),include("features/draw_graph/api/index.js"),include("features/algorithms/api/index.js"),include("features/base_handler/index.js"),include("features/default_handler/index.js"),include("features/add_vertices_handler/index.js"),include("features/connect_vertices_handler/index.js"),include("features/delete_objects_handler/index.js"),include("features/algorithm_handler/index.js"),include("features/serialization/api/index.js"),include("features/enum_vertices/EnumVertices.js"),include("model/texts.js",modulDir),include("model/UndoStack.js",modulDir),include("model/DiskSaveLoad.js",modulDir),include("model/Application.js",modulDir),include("ui/ya_metrika.js",modulDir),include("ui/editor.js",modulDir),include("ui/main.js",modulDir)],onloadEditor);}
 function gEncodeToHTML(str)
 {if(typeof str!=='string')
@@ -291,7 +291,7 @@ Graph.prototype.FindEdgeMin=function(id1,id2)
 {res=edge;minWeight=edge.weight;}}}
 return res;}
 Graph.prototype.FindEdgeMax=function(id1,id2)
-{var res=null;var maxWeight=0;for(var i=0;i<this.edges.length;i++)
+{var res=null;var maxWeight=-this.infinity;for(var i=0;i<this.edges.length;i++)
 {var edge=this.edges[i];if((edge.vertex1.id==id1&&edge.vertex2.id==id2)||(!edge.isDirect&&edge.vertex1.id==id2&&edge.vertex2.id==id1))
 {if(edge.weight>maxWeight)
 {res=edge;maxWeight=edge.weight;}}}
@@ -2018,4 +2018,4 @@ function postLoadPage()
 $(document).ready(function()
 {window.onresize=function(event)
 {resizeCanvas();}
-document.getElementById('canvas').addEventListener("touchstart",touchHandler,true);document.getElementById('canvas').addEventListener("touchmove",touchHandler,true);document.getElementById('canvas').addEventListener("touchend",touchHandler,true);document.getElementById('canvas').addEventListener("touchcancel",touchHandler,true);var isMobile=navigator.userAgent.match(/(iPad)|(iPhone)|(iPod)|(android)|(webOS)/i);if(!isMobile&&!DisableEmscripten){let fullPathToGraphffoline="features/graphoffline/Graphoffline.Emscripten.js";doIncludeAsync([include(fullPathToGraphffoline),],()=>{Module['onRuntimeInitialized']=onRuntimeInitialized;var process=Module.cwrap('ProcessAlgorithm','string',['string']);function onRuntimeInitialized(){editor.application.setEmscripten(process);}})}});moduleLoader.endCacheLoading();
\ No newline at end of file
+document.getElementById('canvas').addEventListener("touchstart",touchHandler,true);document.getElementById('canvas').addEventListener("touchmove",touchHandler,true);document.getElementById('canvas').addEventListener("touchend",touchHandler,true);document.getElementById('canvas').addEventListener("touchcancel",touchHandler,true);var isMobile=navigator.userAgent.match(/(iPad)|(iPhone)|(iPod)|(android)|(webOS)/i);if(!isMobile&&!DisableEmscripten){let fullPathToGraphffoline="features/graphoffline/Graphoffline.Emscripten.js"+"?v="+globalVersion;doIncludeAsync([include(fullPathToGraphffoline),],()=>{Module['onRuntimeInitialized']=onRuntimeInitialized;var process=Module.cwrap('ProcessAlgorithm','string',['string']);function onRuntimeInitialized(){editor.application.setEmscripten(process);}})}});moduleLoader.endCacheLoading();
\ No newline at end of file
diff --git a/script/pages/editor/ui/main.js b/script/pages/editor/ui/main.js
index 7f20628..07477bf 100644
--- a/script/pages/editor/ui/main.js
+++ b/script/pages/editor/ui/main.js
@@ -82,7 +82,7 @@ $(document).ready(function ()
     // Try load emscripten implementation
     var isMobile = navigator.userAgent.match(/(iPad)|(iPhone)|(iPod)|(android)|(webOS)/i);
     if (!isMobile && !DisableEmscripten) {
-      let fullPathToGraphffoline = "features/graphoffline/Graphoffline.Emscripten.js";
+      let fullPathToGraphffoline = "features/graphoffline/Graphoffline.Emscripten.js" + "?v=" + globalVersion;
       doIncludeAsync ([
     	include (fullPathToGraphffoline),
       ], () => {
diff --git a/script/shared/loader.js b/script/shared/loader.js
index 64a218d..973d7e8 100644
--- a/script/shared/loader.js
+++ b/script/shared/loader.js
@@ -1,5 +1,5 @@
 // Global version needs to force reload scripts from server.
-let globalVersion = 75;
+let globalVersion = 76;
 
 var include = function(filename, localDir) {
     return {filename: filename, localDir: localDir};