DSA — Hashing

1 Sum of array elements Easy 2 Find maximum in array Easy 3 Reverse an array in-place Medium 4 Count occurrences of element Easy 5 Second largest element Medium 6 First duplicate in array #1 Easy 7 First duplicate in array #2 Easy 8 First duplicate in array #3 Easy 9 First duplicate in array #4 Easy 10 First duplicate in array #5 Easy 11 First duplicate in array #6 Easy 12 First duplicate in array #7 Easy 13 First duplicate in array #8 Easy 14 First duplicate in array #9 Easy 15 First duplicate in array #10 Easy 16 First duplicate in array #11 Easy 17 First duplicate in array #12 Easy 18 First duplicate in array #13 Easy 19 First duplicate in array #14 Easy 20 First duplicate in array #15 Easy 21 First duplicate in array #16 Easy 22 First duplicate in array #17 Easy 23 First duplicate in array #18 Easy 24 First duplicate in array #19 Easy 25 First duplicate in array #20 Easy 26 First duplicate in array #21 Easy 27 First duplicate in array #22 Easy 28 First duplicate in array #23 Easy 29 First duplicate in array #24 Easy 30 First duplicate in array #25 Easy 31 First duplicate in array #26 Easy 32 First duplicate in array #27 Easy 33 First duplicate in array #28 Easy 34 First duplicate in array #29 Easy 35 First duplicate in array #30 Easy 36 First duplicate in array #31 Easy 37 First duplicate in array #32 Easy 38 First duplicate in array #33 Easy 39 First duplicate in array #34 Easy 40 First duplicate in array #35 Easy 41 First duplicate in array #36 Easy 42 First duplicate in array #37 Easy 43 First duplicate in array #38 Easy 44 First duplicate in array #39 Easy 45 First duplicate in array #40 Easy 46 First duplicate in array #41 Easy 47 First duplicate in array #42 Easy 48 First duplicate in array #43 Easy 49 First duplicate in array #44 Easy 50 First duplicate in array #45 Easy