Add solution for problem 1672: richest customer wealth (#178)

* Add solution for problem 1672: richest customer wealth

* Fix GitHub Actions: Update actions/cache from v1 to v4

- Update actions/cache@v1 to actions/cache@v4 in UnitTest.yml
- Update actions/cache@v1 to actions/cache@v4 in documentation.yml
- Fixes deprecation warning that was causing CI failures

---------

Co-authored-by: ibrahim Al-Aqua <[email protected]>

Author: ibrahimaqua

.github/workflows/UnitTest.yml

@@ -25,7 +25,7 @@ jobs:
           version: ${{ matrix.julia-version }}
 
       - name: Cache artifacts
-        uses: actions/cache@v1
+        uses: actions/cache@v4
         env:
           cache-name: cache-artifacts
         with:

.github/workflows/documentation.yml

@@ -23,7 +23,7 @@ jobs:
         with:
           version: ${{ matrix.julia-version }}
       - name: Cache artifacts
-        uses: actions/cache@v1
+        uses: actions/cache@v4
         env:
           cache-name: cache-artifacts
         with:

src/unresolved/1672.richest-customer-wealth.jl renamed to src/problems/1672.richest-customer-wealth.jl

@@ -1,8 +1,8 @@
 # ---
 # title: 1672. Richest Customer Wealth
 # id: problem1672
-# author: Tian Jun
-# date: 2020-10-31
+# author: Ibrahim Al-Aqua
+# date: 2025-08-05
 # difficulty: Easy
 # categories: Array
 # link: <https://leetcode.com/problems/richest-customer-wealth/description/>
@@ -65,5 +65,8 @@
 ## @lc code=start
 using LeetCode
 
-## add your code here:
+function maximumWealth(accounts::Array{<:Integer,2})::Int
+    return maximum(sum(accounts; dims=2))
+end
+
 ## @lc code=end

test/problems/1672.richest-customer-wealth.jl

@@ -0,0 +1,5 @@
+@testset "1672.richest-customer-wealth.jl" begin
+    @test maximumWealth([1 2 3; 3 2 1]) == 6
+    @test maximumWealth([1 5; 7 3; 3 5]) == 10
+    @test maximumWealth([2 8 7; 7 1 3; 1 9 5]) == 17
+end