Given N keys and values , and q queries for each query you have given key you have to find key smaller than given key with maximun value . for example:- keys — 2 3 1 6 4 values — 5 1 6 2 8 given key 5 must produce output 8 i.e (4,8)
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Sort the keys. Make another array that Max. Max[I] will store the maximum value till index I. You can search the index where the key is just smaller than the input key with lower_bound. Let the index is Ind then the answer is nothing but Max[Ind].