diff --git a/circuit.h b/circuit.h
index a74276c..f99a379 100644
--- a/circuit.h
+++ b/circuit.h
@@ -78,7 +78,7 @@ int* flip_need_update;
 std::vector<Gate*> flip_update_queue;
 
 // incremental stem struct
-int STEM_INC = 0;
+const int STEM_INC = 10000;
 const int STEM_WEIGHT_MAX = 1e9;
 ll stem_total_weight;
 int stem_total_cnt;
diff --git a/ls.cpp b/ls.cpp
index 67ba230..1689d31 100644
--- a/ls.cpp
+++ b/ls.cpp
@@ -8,7 +8,7 @@
 
 bool Circuit::local_search(std::unordered_set<Fault*> &faults) {
 
-    STEM_INC = 0;
+    //STEM_INC = 0;
 
     // 初始化并重置所有 ls 数据结构
     ls_init_data_structs();
@@ -142,7 +142,7 @@ bool Circuit::local_search(std::unordered_set<Fault*> &faults) {
 
 void Circuit::ls_update_weight() {
 
-    STEM_INC++;
+    //STEM_INC += 5;
 
     if(rand() % 10000 <= SP * 10000) {
         for(Gate* g : gates) {
@@ -179,25 +179,29 @@ void Circuit::ls_update_weight() {
                 }
             }
 
-            // for(int i=0; i<=1; i++) {
-            //     if(!fault_weight[g->id][i]) continue;
-            //     for(Gate* suc : g->suc_stems) {
-            //         int inc = 0.2 * fault_weight[g->id][i];
+            for(int i=0; i<=1; i++) {
+                for(Gate* pre : g->suc_stems) {
+                    // int inc = 0.2 * fault_weight[pre->id][i];
+                    // inc = std::max(1, inc);
 
-            //         inc = std::max(inc, 1);
+                    // if(g->type == Gate::NAND || g->type == Gate::NOR || g->type == Gate::NOT || g->type == Gate::XNOR) {
+                    //     if(fault_weight[g->id][!pre->value] + inc <= FAULT_WEIGHT_MAX) {
+                    //         fault_weight[g->id][!pre->value] += inc;
+                    //         if(g->sa[!pre->value]) fault_total_weight += inc;
+                    //     }
+                    // } else {
+                    //     if(fault_weight[g->id][pre->value] + inc <= FAULT_WEIGHT_MAX) {
+                    //         fault_weight[g->id][pre->value] += inc;
+                    //         if(g->sa[pre->value]) fault_total_weight += inc;
+                    //     }
+                    // }
 
-            //         if(fault_weight[suc->id][0] + inc <= FAULT_WEIGHT_MAX) {
-            //             fault_weight[suc->id][0] += inc;
-            //             if(suc->sa[0]) fault_total_weight += inc;
-            //         }
-
-            //         if(fault_weight[suc->id][1] + inc <= FAULT_WEIGHT_MAX) {
-            //             fault_weight[suc->id][1] += inc;
-            //             if(suc->sa[1]) fault_total_weight += inc;
-            //         }
-
-            //     }
-            // }
+                    // if(fault_weight[suc->id][1] + inc <= FAULT_WEIGHT_MAX) {
+                    //     fault_weight[suc->id][1] += inc;
+                    //     if(suc->sa[1]) fault_total_weight += inc;
+                    // }
+                }
+            }
 
             if(!g->sa[0] && fault_weight[g->id][0] > 0 && (fault_weight[g->id][0] + FAULT_INC < FAULT_WEIGHT_MAX)) {
                 fault_weight[g->id][0] += FAULT_INC;