标签：use tor two sum out cto element log tar return
Given an array of integers that is already sorted in ascending order, find two numbers such that they add up to a specific target number.
The function twoSum should return indices of the two numbers such that they add up to the target, where index1 must be less than index2. Please note that your returned answers (both index1 and index2) are not zero-based.
You may assume that each input would have exactly one solution and you may not use the same element twice.
Input: numbers={2, 7, 11, 15}, target=9
Output: index1=1, index2=2
C++(203ms):
1 class Solution { 2 public: 3 vector<int> twoSum(vector<int>& numbers, int target) { 4 vector<int> ans ; 5 for (int i = 0; i < numbers.size();i++ ){ 6 if (numbers[i] > target) 7 break; 8 for (int j = i+1; j < numbers.size();j++ ){ 9 if (numbers[j] > target-numbers[i]) 10 break; 11 if(numbers[i] + numbers[j] == target){ 12 ans.push_back(i+1) ; 13 ans.push_back(j+1) ; 14 } 15 } 16 17 } 18 return ans; 19 } 20 };
C++(9ms):
1 class Solution { 2 public: 3 vector<int> twoSum(vector<int>& numbers, int target) { 4 vector<int> ans ; 5 int left = 0 ; 6 int right = numbers.size()-1; 7 while(left < right){ 8 int t = numbers[left] + numbers[right] ; 9 if (t == target){ 10 ans.push_back(left+1); 11 ans.push_back(right+1); 12 break; 13 }else if(t >target){ 14 right--; 15 }else{ 16 left++; 17 } 18 } 19 return ans; 20 } 21 };
167. Two Sum II - Input array is sorted
标签：use tor two sum out cto element log tar return
原文地址：http://www.cnblogs.com/-Buff-/p/6492476.html
