IntermediateInteractiveFrench▲ 16 votes
France-IOI: Programming & Algorithmics (French)
Progressive French-language algorithmics and programming tracks with an automated judge. Also trains for programming olympiads.
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AdvancedArticleEnglish▲ 13 votes
Teach Yourself Computer Science
An opinionated map of the nine CS subjects that matter and the single best free resource for each.