BIG O

時間 2019-11-11

標籤 big 简体版

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12c++

I've been learning more about Big O Notation and how to calculate it based on how an algorithm is written. I came across an interesting set of "rules" for calculating an algorithms Big O notation and I wanted to see if I'm on the right track or way off.ide

Big O Notation: Noop

function(n) {
    For(var a = 0; i <= n; i++) { // It's N because it's just a single loop
        // Do stuff
    }
}

Big O Notation: N2this

function(n, b) {
    For(var a = 0; a <= n; a++) {
        For(var c = 0; i <= b; c++) { // It's N squared because it's two nested loops
            // Do stuff
        }
    }
}

Big O Notation: 2Nrest

function(n, b) {
    For(var a = 0; a <= n; a++) {
        // Do stuff
    }
    For(var c = 0; i <= b; c++) { // It's 2N the loops are outside each other
        // Do stuff
    }
}

Big O Notation: NLogNcode

function(n) {
    n.sort(); // The NLogN comes from the sort?
    For(var a = 0; i <= n; i++) {
        // Do stuff
    }
}

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