[Task 23] Error when calculating array checksum

When i try to solve this task (23) i give an error -> array checksum not the same this my function : fn checksum(a : &Vec<i32>) -> i32{ let seed =113; let limit = 10000007; let mut result: i32 = 0; for x in a { result = ((result + x)*seed) % limit; } result }

this function work in task 17 "Array checksum" but not work in this task What am I doing wrong?