From 190db4c7f0b40244f5a599a443d286874c420230 Mon Sep 17 00:00:00 2001
From: Feminto <feminto@gmail.com>
Date: Thu, 12 Jun 2025 10:26:21 -0700
Subject: [PATCH 1/3] Adding solutions for all Pandas4 problems

---
 NthHighestSalary.py    | 11 +++++++++++
 SecondHighestSalary.py | 11 +++++++++++
 2 files changed, 22 insertions(+)
 create mode 100644 NthHighestSalary.py
 create mode 100644 SecondHighestSalary.py

diff --git a/NthHighestSalary.py b/NthHighestSalary.py
new file mode 100644
index 0000000..a602900
--- /dev/null
+++ b/NthHighestSalary.py
@@ -0,0 +1,11 @@
+import pandas as pd
+
+def nth_highest_salary(employee: pd.DataFrame, N: int) -> pd.DataFrame:
+    unq_sal = sorted(employee['salary'].drop_duplicates(), reverse= True)
+
+    #invalid cases
+    if len(unq_sal) < N or N <= 0:
+        return pd.DataFrame({f'getNthHighestSalary({N})':[None]})
+
+    nth_sal = unq_sal[N-1] # Nth highest will be calculated as N-1 since the Indexing starts at 0. Eg. 2nd hishest will be at Index 1
+    return pd.DataFrame({f'getNthHighestSalary({N})':[nth_sal]})
\ No newline at end of file
diff --git a/SecondHighestSalary.py b/SecondHighestSalary.py
new file mode 100644
index 0000000..3f130a9
--- /dev/null
+++ b/SecondHighestSalary.py
@@ -0,0 +1,11 @@
+import pandas as pd
+
+def second_highest_salary(employee: pd.DataFrame) -> pd.DataFrame:
+    unq_sal = sorted(employee['salary'].drop_duplicates(), reverse = True)
+    
+    #invalid cases
+    if len(unq_sal) < 2:
+        return pd.DataFrame({'SecondHighestSalary':[None]})
+
+    second_sal = unq_sal[1] # 2nd highest is at Index 1
+    return pd.DataFrame({'SecondHighestSalary':[second_sal]})
\ No newline at end of file

From 479dd670132860ae9a8da1108caca2642d10f902 Mon Sep 17 00:00:00 2001
From: Feminto <feminto@gmail.com>
Date: Thu, 12 Jun 2025 10:45:26 -0700
Subject: [PATCH 2/3] Adding method 2 for solving Nth Highest Salary problem

---
 NthHighestSalary.py | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/NthHighestSalary.py b/NthHighestSalary.py
index a602900..405d1ab 100644
--- a/NthHighestSalary.py
+++ b/NthHighestSalary.py
@@ -3,6 +3,30 @@
 def nth_highest_salary(employee: pd.DataFrame, N: int) -> pd.DataFrame:
     unq_sal = sorted(employee['salary'].drop_duplicates(), reverse= True)
 
+    #invalid cases
+    if len(unq_sal) < N or N <= 0:
+        return pd.DataFrame({f'getNthHighestSalary({N})':[None]})
+
+    nth_sal = unq_sal[N-1] # Nth highest will be calculated as N-1 since the Indexing starts at 0. Eg. 2nd hishest will be at Index 1
+    return pd.DataFrame({f'getNthHighestSalary({N})':[nth_sal]})
+
+
+# Method 2
+import pandas as pd
+
+def nth_highest_salary(employee: pd.DataFrame, N: int) -> pd.DataFrame:
+    r_set = set()
+    for i in range(len(employee)):
+        sal = employee['salary'][i]
+        r_set.add(sal)
+
+    # print(r_set)
+    result = []
+    for i in r_set:
+        result.append(i)
+
+    unq_sal = sorted(result, reverse = True)
+
     #invalid cases
     if len(unq_sal) < N or N <= 0:
         return pd.DataFrame({f'getNthHighestSalary({N})':[None]})

From 7e10e8c2642892da513739a257c26d120b4b514e Mon Sep 17 00:00:00 2001
From: Feminto <feminto@gmail.com>
Date: Thu, 12 Jun 2025 19:35:50 -0700
Subject: [PATCH 3/3] Adding comments within the code of Nth Highest Salary
 solution

---
 NthHighestSalary.py | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/NthHighestSalary.py b/NthHighestSalary.py
index 405d1ab..4ebf315 100644
--- a/NthHighestSalary.py
+++ b/NthHighestSalary.py
@@ -1,3 +1,4 @@
+#Method 1
 import pandas as pd
 
 def nth_highest_salary(employee: pd.DataFrame, N: int) -> pd.DataFrame:
@@ -6,11 +7,16 @@ def nth_highest_salary(employee: pd.DataFrame, N: int) -> pd.DataFrame:
     #invalid cases
     if len(unq_sal) < N or N <= 0:
         return pd.DataFrame({f'getNthHighestSalary({N})':[None]})
-
-    nth_sal = unq_sal[N-1] # Nth highest will be calculated as N-1 since the Indexing starts at 0. Eg. 2nd hishest will be at Index 1
+    else:
+        nth_sal = unq_sal[N-1] # Nth highest will be calculated as N-1 since the Indexing starts at 0. Eg. 2nd hishest will be at Index 1
+    
+    # if invalid case is evaluated later, it causes Runtime Error:
+    # nth_sal will try to access an index that might not exist in unq_sal. 
+    # If N is invalid (e.g., N > len(unq_sal) or N <= 0), then: unq_sal[N-1] throws an IndexError.
+    
     return pd.DataFrame({f'getNthHighestSalary({N})':[nth_sal]})
 
-
+   
 # Method 2
 import pandas as pd