reddragon

If you delete the default Storyboard etc., put this in the AppDelegate.m
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

When setting things like images in cells, reuse the cells. For some reason, if you allocate a fresh cell, it doesn't work.

Pass data between controllers, rather than views, or modifying the view of the next controller.

reddragon

* Select Image View Mode for Image Resizing if its bigger than the screen.
* Delegate - Add callbacks somewhere else when something changes.
* protocol and interface are synonyms in objc.

Delegate Pattern
* Can use delegate instead of passing around controllers.
* Mark protocol methods as @optional if you dont need them.
* Check this via respondsToSelector method.

* KVO

reddragon

1. Do binary search on a rotated array.
Eg., given [100, 110, 121, 5, 11, 44, 78, 91, 99], be able to binary search on it.

2. Implement the * and / operations without actual multiplication and division.

3. Implement the ^ operator without using any in-build exponentiation methods.

4. Implement the median of an unsorted array in O(n).

5. Implement sqrt()

reddragon

Delivery/Logistics:
Instacart
Munchery
Lyft
Sidecar
Uber
Thumbtack
DoorDash
Grubhub
Seamless

reddragon

#include <iostream>
#include <cstdio>
#include <vector>
#include <event2/event.h>
#include <glog/logging.h>
#include <cassert>
#include <string>
#include <cstring>
#include <sys/socket.h>
#include <netinet/in.h>

reddragon

#include <iostream>
#include <vector>
#include <cassert>

using namespace std;

struct Edge {
  int src, dst;
  int w;
};

reddragon

#include <iostream>
#include <cassert>
#include <set>
#include <map>
#include <vector>
#include <algorithm>
#include <utility>
#include <cstdio>
#include <limits>
#include <bitset>

reddragon

#include <iostream>
#include <cassert>
#include <set>
#include <map>
#include <vector>
#include <algorithm>
#include <utility>
#include <cstdio>
#include <limits>
#include <bitset>

reddragon

#pragma once

#include <iostream>
#include <cassert>
#include <set>
#include <map>
#include <vector>
#include <algorithm>
#include <utility>
#include <cstdio>

reddragon

    struct Slope {
      int n, d;  
      Slope(int nn, int dd) {
          int g = gcd(abs(nn), abs(dd));
          // cout << "gcd of " << nn << ", " << dd << " is: " << g << endl;
          n = (g > 0 ? nn/g : nn);
          d = (g > 0 ? dd/g : dd);
      }
    };