Our paper “Uncovering the Bitcoin blockchain: an analysis of the full users graph” has been accepted for publication at DSAA2016 (IEEE DSAA 2016, 3rd IEEE International Conference on Data Science and Advanced Analytics). Thanks to my coauthors: Damiano Di Francesco Maesa and Laura Ricci. Here below the abstract: Bitcoin is a novel decentralized cryptocurrency system[…]


Teaching Python

I used this interactive book for the lectures of Laboratorio di Algoritmica, at University of Pisa, a.a. 2015-2016, to teach basic programming. I then used this other one to teach basic algorithms and data structures. These are shorten versions of the original books by Runestone Interactive. This version has been modified by me for the[…]



Our paper “Sublinear-Space Bounded-Delay Enumeration for Massive Network Analytics: Maximal Cliques” has been presented at ICALP2016. Thanks to my coauthors: Alessio Conte, Roberto Grossi, and Luca Versari. Here below the abstract: Due to the sheer size of real-world networks, delay and space become quite relevant measures for the cost of enumeration in network analytics. This[…]



Our paper “Listing Acyclic Orientations of Graphs with Single and Multiple Sources” has been accepted to be published at Latin American Theoretical Informatics Symposium, LATIN 2016 to be held in Ensenada, Mexico (April 11-15, 2016). The abstract follows. We study enumeration problems for the acyclic orientations of an undirected graph with n nodes and m[…]


On the several proofs about P and NP

Recently, I’ve found this nice web site that collects wrong proofs about P and NP relationship. https://www.win.tue.nl/~gwoegi/P-versus-NP.htm Currently there are 107 proofs. Probably, all of them are wrong (otherwise, probably we would know the guy) and the nice scoring function provided by Scott Aaranson here can be applied. This scoring function is the number of signs exhibited[…]



Our paper “Computing Top-k Closeness Centrality Faster in Unweighted Graphs” has been accepted for ALENEX 2016 (Algorithms Engineering and Experiments). Thanks to all the coauthors Elisabetta Bergamini, Michele Borassi, Pierluigi Crescenzi and Henning Meyerhenke. This work is the result of a merge between our work (see here) and the work by Elisabetta and Henning. It’s a pleasure to start this new collaboration. This is the abstract[…]