Added solution for 1. Two Sum: https://leetcode.com/problems/two-sum/

Author: asesh

algorithm.xcodeproj/project.xcworkspace/xcuserdata/aseshshrestha.xcuserdatad/UserInterfaceState.xcuserstate

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algorithm.xcodeproj/xcuserdata/aseshshrestha.xcuserdatad/xcdebugger/Breakpoints_v2.xcbkptlist

@@ -17,7 +17,9 @@
 #include "graph.hpp"
 
 int main(int argc, const char* argv[]) {
-  invoke_two_sum_ii();
+  invoke_two_sum();
+  
+//  invoke_two_sum_ii();
 
 //    invoke_find_three_number_sum();
 

algorithm/main.cpp

@@ -1442,3 +1442,21 @@ void invoke_two_sum_ii() {
     std::cout<<number<<", ";
   });
 }
+
+std::vector<int> two_sum(std::vector<int>& nums, int target) {
+  std::unordered_map<int, int> hash_map;
+  for(int index = 0; index < nums.size(); ++index) {
+    auto diff = target - nums[index];
+    if(hash_map.count(diff)) {
+      return {hash_map[diff], index};
+    }
+    hash_map[nums[index]] = index;
+  }
+
+  return {};
+}
+void invoke_two_sum() {
+  std::vector<int> input = {2,7,11,15};
+  auto output = two_sum(input, 22);
+  std::cout<<"The indices of two sums are: "<<output[0]<<", "<<output[1]<<std::endl;
+}

algorithm/number.cpp

@@ -287,4 +287,9 @@ void invoke_separate_black_and_white_balls();
 */
 void invoke_two_sum_ii();
 
+/*
+1. Two Sum: https://leetcode.com/problems/two-sum/
+*/
+void invoke_two_sum();
+
 #endif /* NUMBER_HPP */