68 lines
1.5 KiB
C++
68 lines
1.5 KiB
C++
#include <vector>
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namespace {
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void nums_same_consec_diff(int n, int k, std::vector<int> &nums, int number) {
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if (n == 0) {
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nums.push_back(number);
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return;
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}
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auto last_digit = number % 10;
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for (int d = 0; d < 10; d++) {
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if (std::abs(last_digit - d) == k) {
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nums_same_consec_diff(n - 1, k, nums, number * 10 + d);
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}
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}
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}
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} // namespace
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class Solution {
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public:
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std::vector<int> numsSameConsecDiff(int n, int k) {
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std::vector<int> nums;
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for (int d = 1; d < 10; d++) {
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nums_same_consec_diff(n - 1, k, nums, d);
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}
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return nums;
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}
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};
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#pragma region tests
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#include <gtest/gtest.h>
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TEST(examples, first) {
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Solution s;
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ASSERT_EQ(s.numsSameConsecDiff(3, 7),
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(std::vector{181, 292, 707, 818, 929}));
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}
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TEST(examples, second) {
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Solution s;
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ASSERT_EQ(s.numsSameConsecDiff(2, 1),
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(std::vector{10, 12, 21, 23, 32, 34, 43, 45, 54, 56, 65, 67, 76,
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78, 87, 89, 98}));
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}
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TEST(same, two) {
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Solution s;
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ASSERT_EQ(s.numsSameConsecDiff(2, 0),
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(std::vector{11, 22, 33, 44, 55, 66, 77, 88, 99}));
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}
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TEST(same, three) {
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Solution s;
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ASSERT_EQ(s.numsSameConsecDiff(3, 0),
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(std::vector{111, 222, 333, 444, 555, 666, 777, 888, 999}));
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}
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int main(int argc, char **argv) {
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::testing::InitGoogleTest(&argc, argv);
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return RUN_ALL_TESTS();
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}
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#pragma endregion /* tests */
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