Guided lessons
Ordered steps with prerequisites, worked examples, exercises, and checks. Small steps, no gaps.
// cp4cpp · learn by compiling
Every algorithm starts with
one compiling program.
CP4CPP teaches C++ and the algorithms behind competitive programming: guided lessons, a proof-first wiki, and tools that turn theory into reflexes.
- 03
- starter lessons, zero gaps
- 08
- planned wiki branches
- 1
- program standing between you and contest C++
lesson-01/hello.cppAC · 0 ms
#include <iostream> int main() { std::cout << "Hello, CP4CPP!\n"; return 0;}run ▸Hello, CP4CPP!
This is Lesson 01: your entire first session takes one screen.
§ 01 · choose a route
Three doors, one destination:
code that passes.
01New to C++Follow the guided pathBegin with one compiling program, then add input, variables, and your first judge-style task.02Solving contestsReach for a focused referenceContest-useful C++ at your side, then the algorithm handbook when the problem demands it.03Building problemsOpen the authoring toolkitGenerators, validators, checkers, interactors: the full testcase workflow.
§ 02 · how it teaches
Built like a coach,
graded like a judge.
Proof-first wiki
Every algorithm comes with its statement, a proof you can follow, and an implementation you can trust.
Visible computation
Simulations of states, graphs, and geometry. Watch the algorithm move instead of imagining it.
§ 03 · straight from the wiki
Tricks you will
actually use.
The wiki is being written around the bit tricks competitive programmers use. Planned entries will connect each statement to a proof and implementation.
- ① A power of two has exactly one bit set: subtracting one clears it, leaving zero.
- ② Negative two's-complement masks everything above the lowest set bit.
wiki/bitmask/tricks.cppconstexpr
// x ^ x == 0 x ^ 0 == x order does not matterconstexpr bool is_power_of_two(unsigned mask) { return (mask & (mask - 1)) == 0; // ① power of two test: true only here} constexpr unsigned low_bit(unsigned mask) { return mask & (-mask); // ② isolate lowest set bit}§ 04 · the whole system
Nine fields, grouped by job.
§ 05 · the quality contract
MICRO keeps it honest.
MMinimalOnly material with a clear purpose.
IInteractiveFeedback where feedback teaches.
CConsistentOne hierarchy, one vocabulary.
RReadableClear beyond expert readers.
OOptimizableEverything stays improvable.