/in/foo.cc: In function 'void build(int, int, int)':
/in/foo.cc:83:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if(dep_vex[c_dep].size() > limit)
      ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:123:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    if (dep_vex[u].size() > limit) {
        ~~~~~~~~~~~~~~~~~~^~~~~~~