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1FirstBadNumber.swift
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1FirstBadNumber.swift
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//
// ViewController.swift
// StockPrices
//
// Created by thailinh on 5/12/20.
// Copyright © 2020 thailinh. All rights reserved.
//
import UIKit
//Swift
class Solution : VersionControl {
func firstBadVersion(_ n: Int) -> Int {
var left = 1
var right = n
var mid = n/2
while (left < right){
mid = left + (right - left) / 2
if isBadVersion(mid) {
right = mid
}else{
left = mid + 1
}
}
return left
}
}
//C++
/*
class Solution {
public:
int firstBadVersion(int n) {
int left = 1;
int right = n;
int mid = n/2;
while (left < right){
mid = left + ( right - left) / 2 ;
if (isBadVersion(mid)){
right = mid;
}else{
left = mid + 1;
}
}
return left;
}
};
*/