Count occurrence of each word?

Short answer: string sentence = "dotnet is great dotnet is powerful"; string[] words = sentence.Split(' '); Dictionary<string, int> map = new Dictionary<string, int>(); foreach (string word in words) map[word] = map.ContainsKey(word) ? map[word] + 1 : 1;

Example code

string sentence = "dotnet is great dotnet is powerful";
string[] words = sentence.Split(' ');
Dictionary<string, int> map = new Dictionary<string, int>();
foreach (string word in words)
map[word] = map.ContainsKey(word) ? map[word] + 1 : 1;

Real-world example (ShopNest)

In coding rounds, state complexity aloud, write a clear ShopNest-flavored example (orders, carts), then handle edge cases (empty list, null, overflow).

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.