Sys->expand(cnst[k], var[i], simgrid::xbt::random::uniform_real(0.0, 1.5));
Sys->expand_add(cnst[k], var[i], simgrid::xbt::random::uniform_real(0.0, 1.5));
used[k]++;
Sys->expand(cnst[k], var[i], simgrid::xbt::random::uniform_real(0.0, 1.5));
Sys->expand_add(cnst[k], var[i], simgrid::xbt::random::uniform_real(0.0, 1.5));
used[k]++;