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This commit is contained in:
Arkaprabha Chakraborty
2022-07-26 16:15:18 +05:30
commit cef4c4dcc4
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68
Medium/letter-combinations-of-a-phone-number/solution.cpp Normal file
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#include <string>
#include <vector>
class Solution {
public:
std::vector<std::string> letterCombinations(std::string digits) {
std::string letters[] = {"abc", "def", "ghi", "jkl",
"mno", "pqrs", "tuv", "wxyz"};
std::vector<std::string> finvec;
if (digits.length() == 1) {
std::string tmplet = letters[(int)digits[0] - 50];
for (int i = 0; i < tmplet.length(); ++i) {
finvec.push_back(std::string("") + tmplet[i]);
}
}
else if (digits.length() == 2) {
std::string tmplet_0 = letters[(int)digits[0] - 50];
std::string tmplet_1 = letters[(int)digits[1] - 50];
for (int i = 0; i < tmplet_0.length(); ++i) {
for (int j = 0; j < tmplet_1.length(); ++j) {
finvec.push_back(std::string("") + tmplet_0[i] +
tmplet_1[j]);
}
}
}
else if (digits.length() == 3) {
std::string tmplet_0 = letters[(int)digits[0] - 50];
std::string tmplet_1 = letters[(int)digits[1] - 50];
std::string tmplet_2 = letters[(int)digits[2] - 50];
for (int i = 0; i < tmplet_0.length(); ++i) {
for (int j = 0; j < tmplet_1.length(); ++j) {
for (int k = 0; k < tmplet_2.length(); ++k) {
finvec.push_back(std::string("") + tmplet_0[i] +
tmplet_1[j] + tmplet_2[k]);
}
}
}
}
else if (digits.length() == 4) {
std::string tmplet_0 = letters[(int)digits[0] - 50];
std::string tmplet_1 = letters[(int)digits[1] - 50];
std::string tmplet_2 = letters[(int)digits[2] - 50];
std::string tmplet_3 = letters[(int)digits[3] - 50];
for (int i = 0; i < tmplet_0.length(); ++i) {
for (int j = 0; j < tmplet_1.length(); ++j) {
for (int k = 0; k < tmplet_2.length(); ++k) {
for (int l = 0; l < tmplet_3.length(); ++l) {
finvec.push_back(std::string("") + tmplet_0[i] +
tmplet_1[j] + tmplet_2[k] +
tmplet_3[l]);
}
}
}
}
}
return finvec;
}
};