refactor(enemy): Boss 选招与战利品掉落改用 WeightedPick;删除零调用的 SelectWeightedSkill 死代码

Assets/_Game/Scripts/Enemies/Boss/BossBase.cs

@@ -39,8 +39,9 @@ namespace BaseGames.Enemies
         public int CurrentPhase => _currentPhase;
         private Coroutine _counterStaggerCoroutine;
 
-        // 缓存加权候选列表，避免 UseBossSkillWeighted() 每次 new List → GC 分配
+        // 缓存加权候选与其有效权重（两者等长、下标对应），避免 UseBossSkillWeighted() 每次 new List → GC 分配
-        private readonly List<(BossSkillSO skill, float w)> _weightedCandidates = new(8);
+        private readonly List<BossSkillSO> _weightedCandidates = new(8);
+        private readonly List<float>       _candidateWeights   = new(8);
 
         // 单元素缓冲数组，供 ApplyCounterResponse 缓存当前技能，避免 new[] 分配
         private readonly BossSkillSO[] _singleSkillBuf = new BossSkillSO[1];
@@ -110,31 +111,22 @@ namespace BaseGames.Enemies
 
             // 筛选：在当前阶段可用 + 冷却就绪 + weight > 0
             _weightedCandidates.Clear();
-            float totalWeight = 0f;
+            _candidateWeights.Clear();
             foreach (var s in skills)
             {
                 if (s == null || s.weight <= 0f) continue;
                 if (!_skillExecutor.CanUseSkill(s.skillId)) continue;
                 if (!IsSkillAvailableInPhase(s)) continue;
 
+                _weightedCandidates.Add(s);
                 // 防重复：上一个技能权重打折
-                float w = s.skillId == LastUsedSkillId ? s.weight * 0.3f : s.weight;
+                _candidateWeights.Add(s.skillId == LastUsedSkillId ? s.weight * 0.3f : s.weight);
-                _weightedCandidates.Add((s, w));
-                totalWeight += w;
             }
 
-            if (_weightedCandidates.Count == 0 || totalWeight <= 0f) return false;
+            // 加权随机抽取（共享原语：无正权重/无候选时返回 -1）
-
+            int idx = BaseGames.Core.WeightedPick.Index(_candidateWeights);
-            // 加权随机抽取
+            if (idx < 0) return false;
-            float roll = UnityEngine.Random.Range(0f, totalWeight);
+            BossSkillSO selected = _weightedCandidates[idx];
-            BossSkillSO selected = null;
-            float accum = 0f;
-            foreach (var (skill, w) in _weightedCandidates)
-            {
-                accum += w;
-                if (roll <= accum) { selected = skill; break; }
-            }
-            selected ??= _weightedCandidates[_weightedCandidates.Count - 1].skill;
 
             if (!CheckResourceCost(selected)) return false;
 

Assets/_Game/Scripts/Enemies/Boss/BossSkillExecutor.cs

@@ -127,37 +127,6 @@ namespace BaseGames.Boss
         /// <summary>Inspector 中注册的全部技能 SO（只读）。</summary>
         public BossSkillSO[] Skills => _skills;
 
-        /// <summary>
-        /// 从候选技能列表中按 weight 加权随机选择一个技能。
-        /// 权重为 0 的技能不参与选择；所有候选权重均为 0 时返回 null。
-        /// </summary>
-        public BossSkillSO SelectWeightedSkill(System.Collections.Generic.IList<BossSkillSO> candidates)
-        {
-            if (candidates == null || candidates.Count == 0) return null;
-
-            float totalWeight = 0f;
-            for (int i = 0; i < candidates.Count; i++)
-            {
-                var s = candidates[i];
-                if (s != null && s.weight > 0f) totalWeight += s.weight;
-            }
-            if (totalWeight <= 0f) return null;
-
-            float roll = UnityEngine.Random.value * totalWeight;
-            float acc  = 0f;
-            for (int i = 0; i < candidates.Count; i++)
-            {
-                var s = candidates[i];
-                if (s == null || s.weight <= 0f) continue;
-                acc += s.weight;
-                if (roll <= acc) return s;
-            }
-            // 浮点精度兜底：返回最后一个有效候选
-            for (int i = candidates.Count - 1; i >= 0; i--)
-                if (candidates[i]?.weight > 0f) return candidates[i];
-            return null;
-        }
-
         /// <summary>
         /// 执行一个 Boss 技能。若当前正在执行或技能冷却未就绪则返回。
         /// </summary>

Assets/_Game/Scripts/Enemies/LootResolver.cs

@@ -33,32 +33,24 @@ namespace BaseGames.Enemies
             bool isHard = dm != null &&
                           (int)dm.CurrentLevel >= (int)DifficultyLevel.Hard;
 
-            float totalWeight = 0f;
+            // 有效权重只算一遍（难度加成），再交由共享原语加权抽取；无正权重时不掉落。
-            foreach (var entry in table.Entries)
+            var weights = new float[table.Entries.Length];
+            for (int i = 0; i < table.Entries.Length; i++)
             {
+                var entry = table.Entries[i];
                 float w = entry.BaseWeight;
                 if (isHard && entry.ScaleWithDifficulty) w *= 1.5f;
-                totalWeight += w;
+                weights[i] = w;
             }
 
-            if (totalWeight <= 0f) return;
+            int idx = WeightedPick.Index(weights);
+            if (idx < 0) return;
 
-            float roll = Random.Range(0f, totalWeight);
+            var picked = table.Entries[idx];
-            float accum = 0f;
+            if (!string.IsNullOrEmpty(picked.ItemId))
-            foreach (var entry in table.Entries)
+                CollectibleSpawner.SpawnItem(worldPosition, picked.ItemId);
-            {
+            else if (picked.LingZhuAmount > 0)
-                float w = entry.BaseWeight;
+                CollectibleSpawner.SpawnLingZhu(worldPosition, picked.LingZhuAmount);
-                if (isHard && entry.ScaleWithDifficulty) w *= 1.5f;
-                accum += w;
-                if (roll <= accum)
-                {
-                    if (!string.IsNullOrEmpty(entry.ItemId))
-                        CollectibleSpawner.SpawnItem(worldPosition, entry.ItemId);
-                    else if (entry.LingZhuAmount > 0)
-                        CollectibleSpawner.SpawnLingZhu(worldPosition, entry.LingZhuAmount);
-                    return;
-                }
-            }
         }
 
         private static void ApplyDifficultyLingZhuScale(ref int lingZhu)