give 0indexed integer array num determine exist subarray length 2 equal sum note subarray begin different indicesReturn true subarray exist false otherwisea subarray contiguous nonempty sequence element array example 1input num 424output trueexplanation the subarray element 42 24 sum 6Example 2input num 12345output falseexplanation no subarray size 2 sumexample 3input num 000output trueexplanation the subarray nums0nums1 nums1nums2 sum 0 note subarray content subarray consider different different position original array Constraints2 numslength 1000109 numsi 109