What us complexity in programming ?

Question

Complexity important thing to notice while coding. Give your opinion

Answer 1

this is how many operations does your program take to caculate something

for example for (...){...} has time complexity O(n)
or for(...){ for(...) {...} } has O(n^2)
or "for(...) {...} for(...) {...}" gives O(n) because n+n is 2n and O(2n) is O(n)- constant calues are neglected

Hope I answered your question