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Leetcode17.cpp
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108 lines (87 loc) · 2.46 KB
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// Leetcode17.cpp : This file contains the 'main' function. Program execution begins and ends there.
//
#include <iostream>
#include <vector>
#include <string>
using namespace::std;
vector<string> iterations(vector<string> strAll, vector<char> chAll)
{
vector<string> res;
if (0 == strAll.size())
{
for (auto ch : chAll)
{
string a;
a = ch;
res.push_back(a);
}
return res;
}
for (auto str : strAll)
{
for (auto ch : chAll)
{
res.push_back(str + ch);
}
}
return res;
}
vector<string> letterCombinations(string digits)
{
vector<vector<char>> data;
if (0 == digits.length())
return {};
for (auto ch : digits)
{
switch (ch)
{
case '2':
data.push_back(vector<char>{'a', 'b', 'c'});
break;
case '3':
data.push_back(vector<char>{'d', 'e', 'f'});
break;
case '4':
data.push_back(vector<char>{'g', 'h', 'i'});
break;
case '5':
data.push_back(vector<char>{'j', 'k', 'l'});
break;
case '6':
data.push_back(vector<char>{'m', 'n', 'o'});
break;
case '7':
data.push_back(vector<char>{'p', 'q', 'r', 's'});
break;
case '8':
data.push_back(vector<char>{'t', 'u', 'v'});
break;
case '9':
data.push_back(vector<char>{'w', 'x', 'y', 'z'});
break;
default:
break;
}
}
vector<string> res = {};
for (auto vch : data)
{
res = iterations(res, vch);
}
return res;
}
int main()
{
string sigits = "245";
vector<string> res = letterCombinations(sigits);
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