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class Solution {
public:
    int singleNumber(vector<int>& nums) {
        std::sort(nums.begin(), nums.end());
        for(int i = 0; i < nums.size();i+= 2)
    {
       if(nums[i] != nums[i+1]) return nums[i];
    }
    }
};

prog.cpp:3:22: error: 'vector' has not been declared
     int singleNumber(vector<int>& nums) {
                      ^
prog.cpp:3:28: error: expected ',' or '...' before '<' token
     int singleNumber(vector<int>& nums) {
                            ^
prog.cpp: In member function 'int Solution::singleNumber(int)':
prog.cpp:4:9: error: 'sort' is not a member of 'std'
         std::sort(nums.begin(), nums.end());
         ^
prog.cpp:4:19: error: 'nums' was not declared in this scope
         std::sort(nums.begin(), nums.end());
                   ^

Standard output is empty