得到这个错误需要一个声明。 使用 vscode

Question

getting this error expected a declaration. using vscode to solve leetcode problems

#include <iostream>

#include <vector>
using std::vector;

class solution{

public:;

   <int> twoSum(vector <int>& nums, int target)

    { 

        unordered_map<int, int> _map;

        for(int i =0; i < nums.size(); i++){

            int num = nums[i];

            int complement = target - num;

            auto it = _map.find(complement);

            if(it != _map.end()){

                return {it->second, i};

            }

            _map[num] = i;

        }return {}
    }


};

error:

"message": "expected a declaration",
"source": "C/C++",
"startLineNumber": 8,
"startColumn": 4,
"endLineNumber": 8,
"endColumn": 5

Answer 1

You probably want this:

...
#include <vector>
#include <unordered_map>
...
using namespace std;

class solution {

public:
      vector<int> twoSum(vector <int>& nums, int target)
      {
        unordered_map<int, int> _map;

        for (int i = 0; i < nums.size(); i++) {
          int num = nums[i];
          int complement = target - num;
          auto it = _map.find(complement);

          if (it != _map.end()) {
            return { it->second, i };
          }

          _map[num] = i;
        }
        return {};
      }
};