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HackerRank Warmup

Classic warmup problems, taught slowly in Hindi, English, or Hinglish, then typed by you.

When to use this

  • Loops and sums
  • Frequency maps
  • Simulation of a path or clock

C++ template

long long sum = 0;
for (int x : a) sum += x;
return sum;

Dry run

Simple Array Sum 1+2+3+4+10+11 = 31.

Pitfalls

  • int overflow on big sums
  • Forgetting 12 AM is 00
  • Rounding grades when the gap is exactly 3

Say this in the interview

I will walk one sample by hand, then code a single pass.

Problems in this topic (12)

Each opens teach-first (animated when available), then the code panel.