🟢 Port problem 3110 (Score of a String) from Swift to C++23

solutions/3101-3200/3110-score-of-a-string/README.md

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+# 3110. Score of a String
+
+[LeetCode problem 3110](https://leetcode.com/problems/score-of-a-string/)
+
+- **Difficulty**: Easy
+- **Tags**: string
+
+## Description
+
+Given a string `s`, its score is the sum of the absolute difference between
+the ASCII values of every pair of adjacent characters.

solutions/3101-3200/3110-score-of-a-string/solution.cpp

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+#include "solution.hpp"
+
+#include <cstdlib>
+#include <iterator>
+
+namespace leetcode::p3110 {
+
+int solve(const std::string& s) {
+    int score = 0;
+
+    for (int i = 0; i + 1 < std::ssize(s); ++i) {
+        score += std::abs(static_cast<unsigned char>(s.at(static_cast<std::size_t>(i))) -
+                          static_cast<unsigned char>(s.at(static_cast<std::size_t>(i) + 1)));
+    }
+
+    return score;
+}
+
+} // namespace leetcode::p3110

solutions/3101-3200/3110-score-of-a-string/solution.hpp

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+#pragma once
+
+#include <string>
+
+namespace leetcode::p3110 {
+
+// optimized: O(n) time, O(1) space — sum |s[i] - s[i+1]| over adjacent
+// characters.
+int solve(const std::string& s);
+
+} // namespace leetcode::p3110

solutions/3101-3200/3110-score-of-a-string/test.cpp

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+#include <catch2/catch_test_macros.hpp>
+
+#include "solution.hpp"
+
+TEST_CASE("Problem 3110", "[p3110]") {
+    CHECK(leetcode::p3110::solve("hello") == 13);
+    CHECK(leetcode::p3110::solve("zaz") == 50);
+}