无法检查向量中的重复项

Question

这是我的一大堆代码。我试图循环向量，如果有重复，我想输出“每个数字必须不同”。问题是当矢量元素不相同时，它仍然输出“每个数字必须不同”。我做错了什么？

bool endLoop = false;
        for(int g = 0; g < guessVec.size(); ++g){
            for( int j = 1; j < guessVec.size(); ++j){
                if(guessVec.at(g) == guessVec.at(j)){
                    endLoop = true;
                }
                else if( guessVec.at(g) != guessVec.at(j)){
                    endLoop = false;
                }
            }
            if(endLoop){
                cout << "Each number must be different.";
                break;
        }

Answer 1

    bool endLoop = false;
    for(int g = 0; g < guessVec.size(); ++g)
    {
        for(int j = g + 1; j < guessVec.size(); ++j) //<-- j can start from 'g + 1'
        {
            if(guessVec.at(g) == guessVec.at(j))
            {
                endLoop = true;
                break; //<-- you can break the loop once you discovered a duplicate
            }

            //else if( guessVec.at(g) != guessVec.at(j))
            //{             
            //    endLoop = false;
            //}

        }

        if(endLoop == true)
        {
            cout << "Each number must be different.";
            break;
        }
    }