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Leetcode49.cpp
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103 lines (83 loc) · 2.52 KB
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// Leetcode49.cpp : This file contains the 'main' function. Program execution begins and ends there.
//
#include <iostream>
#include <vector>
#include <string>
#include <array>
#include <unordered_map>
#include <algorithm>
using namespace::std;
bool checkAnagram(string& s1, string& s2)
{
array<int, 26> arr1{ 0 }, arr2{ 0 };
for (auto& ch : s1)
++arr1[ch - 'a'];
for (auto& ch : s2)
++arr2[ch - 'a'];
return arr1 == arr2;
}
vector<vector<string>> groupAnagrams(vector<string>& strs)
{
vector<vector<string>> anagrams;
if (strs.empty())
{
anagrams.push_back(strs);
return anagrams;
}
for (auto& str : strs)
{
if (anagrams.empty())
{
anagrams.push_back(vector<string>{str});
continue;
}
int flag = 0;
for (auto& anagram : anagrams)
{
if (anagram[0].size() != str.size())
continue;
if (checkAnagram(anagram[0], str))
{
anagram.push_back(str);
flag = 1;
break;
}
}
if(!flag)
anagrams.push_back(vector<string>{str});
}
return anagrams;
}
vector<vector<string>> groupAnagramsBetter(vector<string>& strs)
{
vector<vector<string>> anagrams;
unordered_map<string, vector<string>> mapAnagrams;
for (auto str : strs)
{
string s = str;
sort(str.begin(), str.end());
mapAnagrams[str].push_back(s);
}
for (auto &mapAnagram : mapAnagrams)
{
anagrams.push_back(mapAnagram.second);
}
return anagrams;
}
int main()
{
//vector<string> strs = { "eat", "tea", "tan", "ate", "nat", "bat" };
//vector<vector<string>> anagrams = groupAnagrams(strs);
vector<string> strs = { "" };
vector<vector<string>> anagrams = groupAnagramsBetter(strs);
std::cout << "Hello World!\n";
}
// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
// Debug program: F5 or Debug > Start Debugging menu
// Tips for Getting Started:
// 1. Use the Solution Explorer window to add/manage files
// 2. Use the Team Explorer window to connect to source control
// 3. Use the Output window to see build output and other messages
// 4. Use the Error List window to view errors
// 5. Go to Project > Add New Item to create new code files, or Project > Add Existing Item to add existing code files to the project
// 6. In the future, to open this project again, go to File > Open > Project and select the .sln file