Primality test (Trial division)
(Mylib/Number/Prime/is_prime.cpp)

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• Last update: 2021-04-23 23:44:44+09:00

Operations

Requirements

Notes

Problems

References

Verified with

• test/aoj/ALDS1_1_C/main.test.cpp

Code

#pragma once

namespace haar_lib {
  constexpr bool is_prime(int n) {
    if (n <= 1) return false;
    for (int i = 2; i * i <= n; ++i) {
      if (n % i == 0) return false;
    }
    return true;
  }
}  // namespace haar_lib

#line 2 "Mylib/Number/Prime/is_prime.cpp"

namespace haar_lib {
  constexpr bool is_prime(int n) {
    if (n <= 1) return false;
    for (int i = 2; i * i <= n; ++i) {
      if (n % i == 0) return false;
    }
    return true;
  }
}  // namespace haar_lib

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