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1- Getting the parallel version to work was a pain. Two major gotchas:
2 (1) -ltbb had to be added *at the end* of the command line
3 (2) clang requires a libstdc++ option to make this work
4 of course everything was terrible to decipher with C++ compile errors
5 being the mess they are.
6- For measuring time I could also use
7 clock_t begin = clock();
8 ...
9 clock_t end = clock();
10 double time = (dobule)(end - begin) / CLOCKS_PER_SEC;
11 but it does not work with the parallel version (it meausres CPU clocks).

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