Update naming-a-company.cpp

Author: kamyu104

C++/naming-a-company.cpp

@@ -22,34 +22,3 @@ class Solution {
         return result * 2;
     }
 };
-
-// Time:  O(26 * n * l)
-// Space: O(n * l)
-// hash table, math
-class Solution2 {
-public:
-    long long distinctNames(vector<string>& ideas) {
-        vector<unordered_set<string>> lookup(26);
-        for (const auto& idea : ideas) {
-            lookup[idea[0] - 'a'].emplace(idea.substr(1));
-        }
-        vector<vector<int64_t>> cnt(26, vector<int64_t>(26));
-        for (int i = 0; i < 26; ++i) {
-            for (const auto& x : lookup[i]) {
-                for (int j = 0; j < 26; ++j) {
-                    if (j == i) {
-                        continue;
-                    }
-                    cnt[i][j] += !lookup[j].count(x);
-                }
-            }
-        }
-        int64_t result = 0;
-        for (int i = 0; i < 26; ++i) {
-            for (int j = i + 1; j < 26; ++j) {
-                result += cnt[i][j] * cnt[j][i];
-            }
-        }
-        return result * 2;
-    }
-};