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My Java solution with o(n) time complexity and constant space:
publicstaticintlonelyinteger(List<Integer>a){if(a.size()==1)returna.get(0);//only element available//use XOR to compare elementsintres=0;for(inti=0;i<a.size();i++)res=a.get(i)^res;returnres;}
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Lonely Integer
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My Java solution with o(n) time complexity and constant space: