Fix indexing and empty search results bugs in Pandas and React implementations

Author: myoshi2891

SQL/Leetcode/Intermediate Select/1204. Last Person to Fit in the Bus/Claude Sonnet 4.6 Extended/Last_Person_to_Fit_in_the_Bus_Pandas.md

@@ -46,7 +46,10 @@ def last_passenger(queue: pd.DataFrame) -> pd.DataFrame:
 
     # Step3: 条件を満たす最後の行（最大 turn）を idxmax で取得
     #        cum_w は turn 昇順なので、最後の True のインデックス = 答え
-    last_idx = mask[mask].index[-1]   # O(N)
+    valid_mask = mask[mask]
+    if valid_mask.empty:
+        return pd.DataFrame({'person_name': []})
+    last_idx = valid_mask.index[-1]   # O(N)
 
     # Step4: 仕様列のみ返却
     return pd.DataFrame({'person_name': [queue.at[last_idx, 'person_name']]})
@@ -235,6 +238,9 @@ def last_passenger(queue: pd.DataFrame) -> pd.DataFrame:
     # side='right': 1000 より大きくなる最初の位置を返す → -1 で最後の有効位置
     last_pos = np.searchsorted(cum_w, 1000, side='right') - 1
 
+    if last_pos < 0:
+        return pd.DataFrame({'person_name': []})
+
     return pd.DataFrame(
         {'person_name': [names[order[last_pos]]]}
     )
@@ -277,6 +283,9 @@ def last_passenger(queue: pd.DataFrame) -> pd.DataFrame:
     cum_w    = weights_sorted.cumsum()        # O(N)
     last_pos = np.searchsorted(cum_w, 1000, side='right') - 1
 
+    if last_pos < 0:
+        return pd.DataFrame({'person_name': []})
+
     return pd.DataFrame(
         {'person_name': [names_sorted[last_pos]]}
     )

SQL/Leetcode/Intermediate Select/1204. Last Person to Fit in the Bus/Claude Sonnet 4.6 Extended/Last_Person_to_Fit_in_the_Bus_React.html

@@ -430,6 +430,9 @@ <h3 class="outfit font-bold text-amber-800 mb-2 text-base">
     # side='right': 1000 より大きくなる最初の位置 → -1 で最後の有効位置
     last_pos = np.searchsorted(cum_w, 1000, side='right') - 1
 
+    if last_pos < 0:
+        return pd.DataFrame({'person_name': []})
+
     return pd.DataFrame({'person_name': [names_sorted[last_pos]]})
 
 
@@ -1363,6 +1366,11 @@ <h3 class="outfit font-bold text-slate-800 mb-3 text-base">
             }
 
             function CumsumVisual({ data }) {
+                const lastIndex = data.cumvals.reduce(
+                    (lastIdx, v, i) => (v <= data.limit ? i : lastIdx),
+                    -1,
+                );
+
                 return (
                     <div className="mt-4">
                         <div className="text-xs font-bold text-slate-500 mb-2">{data.label}</div>
@@ -1375,7 +1383,7 @@ <h3 class="outfit font-bold text-slate-800 mb-3 text-base">
                                         className={[
                                             'flex flex-col items-center rounded-xl p-2 border-2 transition',
                                             ok
-                                                ? i === 2
+                                                ? i === lastIndex
                                                     ? 'bg-emerald-200 border-emerald-500'
                                                     : 'bg-emerald-50 border-emerald-300'
                                                 : 'bg-red-50 border-red-300',

public/SQL/Leetcode/Intermediate Select/1204. Last Person to Fit in the Bus/Claude Sonnet 4.6 Extended/Last_Person_to_Fit_in_the_Bus_React.html

@@ -430,6 +430,9 @@ <h3 class="outfit font-bold text-amber-800 mb-2 text-base">
     # side='right': 1000 より大きくなる最初の位置 → -1 で最後の有効位置
     last_pos = np.searchsorted(cum_w, 1000, side='right') - 1
 
+    if last_pos < 0:
+        return pd.DataFrame({'person_name': []})
+
     return pd.DataFrame({'person_name': [names_sorted[last_pos]]})
 
 
@@ -1363,6 +1366,11 @@ <h3 class="outfit font-bold text-slate-800 mb-3 text-base">
             }
 
             function CumsumVisual({ data }) {
+                const lastIndex = data.cumvals.reduce(
+                    (lastIdx, v, i) => (v <= data.limit ? i : lastIdx),
+                    -1,
+                );
+
                 return (
                     <div className="mt-4">
                         <div className="text-xs font-bold text-slate-500 mb-2">{data.label}</div>
@@ -1375,7 +1383,7 @@ <h3 class="outfit font-bold text-slate-800 mb-3 text-base">
                                         className={[
                                             'flex flex-col items-center rounded-xl p-2 border-2 transition',
                                             ok
-                                                ? i === 2
+                                                ? i === lastIndex
                                                     ? 'bg-emerald-200 border-emerald-500'
                                                     : 'bg-emerald-50 border-emerald-300'
                                                 : 'bg-red-50 border-red-300',