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Educational Codeforces Round 140 Editorial

 1 year ago
source link: https://codeforces.com/blog/entry/110225
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Educational Codeforces Round 140 Editorial

By awoo, history, 20 hours ago, translation,

1767A - Cut the Triangle

Idea: BledDest

Tutorial
Solution (BledDest)

1767B - Block Towers

Idea: BledDest

Tutorial
Solution (awoo)

1767C - Count Binary Strings

Idea: BledDest

Tutorial
Solution (BledDest)

1767D - Playoff

Idea: Neon

Tutorial
Solution (Neon)

1767E - Algebra Flash

Idea: BledDest

Tutorial
Solution (awoo)

1767F - Two Subtrees

Idea: shnirelman

Tutorial
Solution (shnirelman)

19 hours ago, # |

I have become an Expert thanks to this contest! Great D by the way.

19 hours ago, # |

← Rev. 2 →  

0

In problem A, since the first line is empty. I read it as a string and never bothered to use it. It WA'd. This is my submission 185477892 . After the contest, I didn't even bother to read the first line and used the same code as above and it got AC. I am not sure why and could use some help.185647398

  • 16 hours ago, # ^ |

    cin >> [whatever] doesn't work as you think. The input data is split into tokens: a token is a sequence of characters. Tokens are separated by whitespaces (incl. normal spaces and newline characters). Doing cin >> [whatever] reads the next token* and tries to convert it into the type of the variable. Doing cin >> [whatever] always skips over any spaces and newline characters. Thus, your cin >> s reads the first integer into your string, messing up the values. In order to read a full line into a single string (including all spsces, but not the newline character) you need to do the following:

    string s;
getline(cin, s);

    *doing cin >> [char] only reads the next character, but it still skips whitespaces.

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