// This C++ program finds all strings formed from a given
// number where each digit maps to given characters.
#include <bits/stdc++.h>
using namespace std;
// Indicates function to find all strings formed from a given
// number where each digit maps to given characters.
vector<string> findCombinations1(vector<int> input1,
vector<char> table1[])
{
// Indicates vector of strings to store output
vector<string> out1, temp1;
// Used to store index of first occurrence
// of the digits in input
unordered_map<int, int> mp1;
// Used to maintain index of current digit considered
int index1 = 0;
// in case of,for each digit
for (int d: input1)
{
// Used to store index of first occurrence
// of the digit in the map
if (mp1.find(d) == mp1.end())
mp1[d] = index1;
// Used to clear vector contents for future use
temp1.clear();
// Doing for each character thats maps to the digit
for (int i = 0; i < table1[d - 1].size(); i++)
{
// In this case,for first digit, simply push all its
// mapped characters in the output list
if (index1 == 0)
{
string s(1, table1[d - 1].at(i));
out1.push_back(s);
}
// Now from second digit onwards
if (index1 > 0)
{
// In this case, for each string in output list
// append current character to it.
for(string str: out1)
{
// Used to convert current character to string
string s(1, table1[d - 1].at(i));
// It should be noted that if this is not the first
// occurrence
// of the digit, use same character as used
// in its first occurrence
if(mp1[d] != index1)
s = str[mp1[d]];
str = str + s;
// Used to store strings formed by current digit
temp1.push_back(str);
}
// In this case,nothing more needed to be done if this
// is not the first occurrence of the digit
if(mp1[d] != index1)
break;
}
}
// Used to replace contents of output list with temp list
if(index1 > 0)
out1 = temp1;
index1++;
}
return out1;
}
// Driver program
int main()
{
// Indicates vector to store the mappings
vector<char> table1[] =
{
{ 'A', 'B', 'C' },
{ 'D', 'E', 'F' },
{ 'G', 'H', 'I' },
{ 'J', 'K', 'L' },
{ 'M', 'N', 'O' },
{ 'P', 'Q', 'R' },
{ 'S', 'T', 'U' },
{ 'V', 'W', 'X' },
{ 'Y', 'Z' }
};
// vector to store input number
vector<int> input1 = { 4, 3, 5};
vector<string> out1 = findCombinations1(input1, table1);
// print all possible strings
for (string it: out1)
cout << it << " ";
return 0;
}
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