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Added solution for 39. Combination Sum: https://leetcode.com/problems…
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@asesh
asesh committed Nov 21, 2024
1 parent 02b57ec commit 670f858
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52 changes: 34 additions & 18 deletions ...rithm.xcodeproj/xcuserdata/aseshshrestha.xcuserdatad/xcdebugger/Breakpoints_v2.xcbkptlist
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4 changes: 3 additions & 1 deletion algorithm/main.cpp
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#include "trie.hpp"

int main(int argc, const char* argv[]) {
invoke_generate_parentheses();
invoke_combination_sum();

// invoke_generate_parentheses();

// invoke_find_peak_element();

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58 changes: 58 additions & 0 deletions algorithm/number.cpp
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Expand Up @@ -1985,3 +1985,61 @@ void invoke_find_peak_element() {
std::vector<int> input = {1,2,3,1};
std::cout<<"The peak element is: "<<find_peak_element(input);
}

/*
Input: [2,3], Target: 6, Output: [[2,2,2],[3,3]]
Process:
sort the input
2 3
2(+2) 4+3!
6(+4)* 2+3
2+3+3!
3
3+3*
Input: [2,3], Target: 7, Output: [[2,2,2],[3,3]]
Process: sort the input
2 3
2+2 ->4+3* 3
2+4! 2+3 3+3
5+3! 6+3!
Input: [2,3,6,7], Target: 7, Output: [[2,2,3],[7]]
2 3 6 7
4 /6+3! 6 12!
6 /4+3 9!
8!
*/
void combination_sum(std::vector<int>& input, int target, std::vector<int> candidate,
int current_index, std::vector<std::vector<int>>& output) {
if(target == 0) {
output.push_back(candidate);
return;
}

for(int index = current_index; index < input.size(); ++index) {
int current_number = input[index];
if(current_number > target) { // 2>7, 2>5, 2>3, 2>1?true
return;
}

candidate.push_back(current_number); // 2, 2, 2
combination_sum(input, target - current_number, candidate, index, output); // target: 7-2=5, 5-2=3, 3-2=1
candidate.pop_back();
}
}
void invoke_combination_sum() {
std::vector<std::vector<int>> output;
std::vector<int> input = {2,3,6,7};
combination_sum(input, 7, {}, 0, output);
std::cout<<"Combination sum: "<<"[";
std::for_each(output.begin(), output.end(), [](std::vector<int> numbers) {
std::cout<<"[";
for(auto& number: numbers) {
std::cout<<number<<", ";
}
std::cout<<"]";
});
std::cout<<"]";
}
5 changes: 5 additions & 0 deletions algorithm/number.hpp
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Expand Up @@ -354,4 +354,9 @@ void invoke_search_a_2d_matrix();
*/
void invoke_find_peak_element();

/*
39. Combination Sum: https://leetcode.com/problems/combination-sum
*/
void invoke_combination_sum();

#endif /* NUMBER_HPP */

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