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class Solution {
public:
    int singleNumber(vector<int>& nums) {
       sort(nums.begin(), nums.end());
 
       if(nums[0] != nums[1])
            return nums[0];
        if(nums[nums.size() - 1] != nums[nums.size() - 2])
            return nums[nums.size() - 1];
 
 
       for(int i = 1; i < nums.size() - 1; i++) {
 
           if(nums[i] != nums[i-1] && 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:4:13: error: 'nums' was not declared in this scope
        sort(nums.begin(), nums.end());
             ^
prog.cpp:4:37: error: 'sort' was not declared in this scope
        sort(nums.begin(), nums.end());
                                     ^

Standard output is empty