/in/foo.cc: In function 'void work()':
/in/foo.cc:81:22: warning: 'tmpy' may be used uninitialized in this function [-Wmaybe-uninitialized]
     if(dep[fa[tmpy][j]>dep[t]])
            ~~~~~~~~~~^
/in/foo.cc:111:20: warning: 'tmpx' may be used uninitialized in this function [-Wmaybe-uninitialized]
    ansx=v[1]-v[tmpx];
              ~~~~~~^