[leetcode] 1. Two Sum

Posted 2020-10-07 zmj97

Given an array of integers, return indices of the two numbers such that they add up to a specific target.

You may assume that each input would have exactly one solution, and you may not use the same element twice.

Example:

Given nums = [2, 7, 11, 15], target = 9,

Because nums[0] + nums[1] = 2 + 7 = 9,
return [0, 1].

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这应该是leetcode里最简单的题，简单的循环。

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以下是我的代码：

class Solution {
public:
    vector<int> twoSum(vector<int>& nums, int target) {
        vector<int> re;
        for (int i = 0; i < nums.size() - 1; i++) {
            for (int j = nums.size() - 1; j > i; j--) {
                if (nums[i] + nums[j] == target) {
                    re.push_back(i);
                    re.push_back(j);
                    return re;
                }
            }
        }
        return re;
    }
};