{"raw_statement":[{"iden":"problem statement","content":"Given is a sequence of integers $A_1, A_2, ..., A_N$. If its elements are pairwise distinct, print `YES`; otherwise, print `NO`."},{"iden":"constraints","content":"*   $2 ≤ N ≤ 200000$\n*   $1 ≤ A_i ≤ 10^9$\n*   All values in input are integers."},{"iden":"input","content":"Input is given from Standard Input in the following format:\n\n$N$\n$A_1$ $...$ $A_N$"},{"iden":"sample input 1","content":"5\n2 6 1 4 5"},{"iden":"sample output 1","content":"YES\n\nThe elements are pairwise distinct."},{"iden":"sample input 2","content":"6\n4 1 3 1 6 2"},{"iden":"sample output 2","content":"NO\n\nThe second and fourth elements are identical."},{"iden":"sample input 3","content":"2\n10000000 10000000"},{"iden":"sample output 3","content":"NO"}],"translated_statement":null,"sample_group":[],"show_order":["default"],"formal_statement":null,"simple_statement":null,"has_page_source":true}