# Test System

Most of my development is done on a Intel® Core™ i7-2600K CPU @ 3.40GHz.

My default compiler is G++ with a x86_64 target and its command-line settings are

`g++ -O3 -march=native -fno-exceptions -fno-rtti -std=c++11`

# Execution Time

The majority of my C++ solutions need much longer to compile than to run.

The "slowest" solutions are (user time displayed by `time`

):

problem | seconds |
---|---|

211 - Divisor Square Sum | 14.64 seconds |

229 - Four Representations using Squares | 10.46 seconds |

103 - Special subset sums: optimum | 4.27 seconds |

146 - Investigating a Prime Pattern | 3.21 seconds |

214 - Totient Chains | 2.69 seconds |

60 - Prime pair sets | 1.69 seconds |

70 - Totient permutation | 1.51 seconds |

136 - Singleton differences | 1.21 seconds |

145 - How many reversible numbers are there below one ... | 0.80 seconds |

179 - Consecutive positive divisors | 0.78 seconds |

**Note:**120 out of 160 solutions find the correct result in less than 0.1 seconds.

# Memory Consumption

The GCC standard library consumes about 2 MByte RAM (basic I/O, etc.).

problem | peak RAM consumption |
---|---|

165 - Intersections | 68.9 MB |

193 - Squarefree Numbers | 39.1 MB |

75 - Singular integer right triangles | 26.3 MB |

179 - Consecutive positive divisors | 21.6 MB |

39 - Integer right triangles | 21.3 MB |

87 - Prime power triples | 20.1 MB |

113 - Non-bouncy numbers | 18.4 MB |

211 - Divisor Square Sum | 17.9 MB |

149 - Searching for a maximum-sum subsequence | 17.6 MB |

187 - Semiprimes | 16.5 MB |

**Note:**120 out of 160 solutions allocate less than 2.5 MByte.

Some solutions could be modified to use smaller data types, especially because an `int`

is 8 bytes on my system (64 bit compiler).

# Code Metrics

C++ programs tend to be a bit longer than other popular languages (such as Python).

The metric "lines of code" excludes comments, empty lines and preprocessor commands.

problem | lines of code | comments | blank lines |
---|---|---|---|

80 - Square root digital expansion | 234 | 66 | 42 |

60 - Prime pair sets | 204 | 65 | 38 |

54 - Poker hands | 188 | 28 | 26 |

146 - Investigating a Prime Pattern | 187 | 59 | 41 |

98 - Anagramic squares | 169 | 49 | 42 |

50 - Consecutive prime sum | 168 | 46 | 38 |

119 - Digit power sum | 159 | 34 | 27 |

90 - Cube digit pairs | 141 | 32 | 28 |

66 - Diophantine equation | 136 | 30 | 25 |

33 - Digit cancelling fractions | 123 | 40 | 19 |

**Note:**81 out of 160 solutions have less than 50 lines of code.

# Heatmap

green problems solve the original Project Euler problem and have a perfect score of 100% at Hackerrank, too.

yellow problems score less than 100% at Hackerrank (but still solve the original problem).

gray problems are already solved but I haven't published my solution yet.

blue problems are solved and there wasn't a Hackerrank version of it at the time I solved it or I didn't care about it because it differed too much.

*Please click on a problem's number to open my solution to that problem:*

1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 |

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My username at Project Euler is

**stephanbrumme**while it's stbrumme at Hackerrank.